Java Programming Class

Can anyone recommend a good training class that covers Java programming with enterprise portals, i.e, Java IView development, etc.
Thanks

Hi,
do you had a look at:
http://www.sap.com/services/education/index.epx
Regards
Gregor

Similar Messages

I'm in a java programming class and i'm stuck.. so please help me guys...

Please help me, i really need help.
Thanks a lot guys...
this is my error:
C:\Temp>java Lab2
Welcome!
This program computes the average, the
exams
The lowest acceptable score is 0 and th
Please enter the minimum allowable scor
Please enter the maximum allowable scor
Was Exam1taken?
Please Enter Y N or Q
y
Enter the Score for Exam1:
65
Was Exam2taken?
Please Enter Y N or Q
y
Enter the Score for Exam2:
32
Was Exam3taken?
Please Enter Y N or Q
y
Enter the Score for Exam3:
65
Was Exam4taken?
Please Enter Y N or Q
y
Enter the Score for Exam4:
32
Was Exam5taken?
Please Enter Y N or Q
y
Enter the Score for Exam5:
32
Score for Exam1 is:65
Score for Exam2 is:32
Score for Exam3 is:32
Score for Exam4 is:32
Score for Exam5 is:32
the Minimum is:0
the Maximum is:0
Can't compute the Average
Can't compute the Variance
Can't compute the Standard Deviation
this is my code:
// Lab2.java
// ICS 21 Fall 2002
// Read in scores for a student's exams, compute statistics on them, and print out
// the scores and statistics.
public class Lab2
     // Create a manager for this task and put it to work
     public static void main(String[] args)
          ExamsManager taskManager = new ExamsManager();
          taskManager.createResults();
// ExamsManager.java for Lab 2
// ICS 21 Fall 2002
// make these classes in the Java library available to this program.
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.text.NumberFormat;
// ExamsManager creates managers and contains the tools (methods) they need to do their
// job: obtaining exam information, computing statistics and printing out that information
class ExamsManager
     // INVALID_INT: special integer value to indicate that a non-integer
     // was entered when an integer was requested. It's chosen so as not to
     // conflict with other flags and valid integer values
     public static final int INVALID_INT = -9999;
     // valid user response constants:
     public static final String YES = "Y";               // user responded "yes"
     public static final String NO = "N";               // user responded "no"
     public static final String EXIT_PROGRAM = "Q";     // user responded "leave the program NOW"
     // INVALID_RESPONSE: special String value to indicate that something other than
     // "Y", "N" or "X" was entered when said was required
     public static final String INVALID_RESPONSE = "!";
     // ABSOLUTE_MIN_SCORE and ABSOLUTE_MAX_SCORE represent the smallest
     // minimum score and the largest maximum score allowed by the
     // program. (The allowable minimum and maximum for one
     // execution of the program may be different than these, but
     // they must both lie within this range.)
     public static final int ABSOLUTE_MIN_SCORE = 0;
     public static final int ABSOLUTE_MAX_SCORE = 1000;
     // The manager needs a place to store this student's exams
     private OneStudentsWork thisWork;
     // ...places to store the min and max scores allowed for these exams
     private int minAllowedScore;
     private int maxAllowedScore;
     // ...and a place to hold input coming from the keyboard
     BufferedReader console;
     //                    -------------------- Constructor --------------------
     // ExamsManager() make managers that delegate the major tasks of the program
     public ExamsManager()
     //                    -------------------- Processing methods --------------------
     // createResults() is the "manager at work": it calls assistants to welcome the user,
     // initializes things so we can read info from the keyboard,
     // obtain the minimum and maximum allowed scores,
     // obtain a student's work and comute the statistics on it and
     // print out the scores and the statistics
     public void createResults()
          // *** YOUR CODE GOES HERE ***
          printWelcomeMessage();
          readyKeyboard();
          obtainMinAndMaxAllowedScores();
          obtainOneStudentsWork();
          printResults();
     //                    -------------------- User input methods --------------------
     // readyKeyboard() sets up an input stream object 'console' connected to the keyboard
     // so that what's typed can be read into the program and processed.
     // Do not modify this code!
     private void readyKeyboard()
               console = new BufferedReader(new InputStreamReader(System.in));
     // obtainMinAndMaxAllowedScores() asks the user to enter the minimum
     // and maximum allowable scores for this execution of the program.
     // Both the minimum and maximum allowable scores must be between
     // ABSOLUTE_MIN_SCORE and ABSOLUTE_MAX_SCORE (inclusive). This
     // method should continue to ask the user for a minimum until a
     // valid one is entered (or EXIT_PROGRAM is entered), then continue
     // to ask the user for a maximum until a valid one is entered. If
     // the minimum entered is greater than the maximum entered, the
     // whole thing should be done again.
     public void obtainMinAndMaxAllowedScores()
          // *** YOUR CODE GOES HERE ***
          int response = INVALID_INT;
          if (response >= minAllowedScore && response <= maxAllowedScore)
               System.out.print("Please enter the minimum allowable score:");
               response = getIntOrExit();
          while (response > maxAllowedScore || response < minAllowedScore)
               System.out.print("Please enter the minimum allowable score:");
               response = getIntOrExit();
          if (response <= ABSOLUTE_MAX_SCORE && response >= ABSOLUTE_MIN_SCORE)
               System.out.print("Please enter the maximum allowable score:");
               response = getIntOrExit();
          while (response > ABSOLUTE_MAX_SCORE || response < ABSOLUTE_MIN_SCORE)
               System.out.print("Please enter the maximum allowable score:");
               response = getIntOrExit();
          /*int response;
          String allowedMin;
          boolean done = true;
          do
               done = true;
               System.out.print("Please enter the minimum allowable score:");
               response = getIntOrExit();
               allowedMin = getYNOrExit();
               if(allowedMin == EXIT_PROGRAM)
                    System.exit(0);
               else if (response >= ABSOLUTE_MIN_SCORE)
                    done = true;
               else if (response >= ABSOLUTE_MAX_SCORE)
                    done = false;
                    System.out.println("INVALID: " + INVALID_INT);
                    System.out.print("Please enter the minimum allowable score:");
                    response = getIntOrExit();
          }while (!done);
/*          System.out.print("Please enter the maximum allowable score:");
          response = getIntOrExit();
          if (response <= ABSOLUTE_MAX_SCORE)
          return response;
          else if (response <= ABSOLUTE_MIN_SCORE)
               response = INVALID_INT;
          while (response == INVALID_INT)
               System.out.print("Please enter the maximum allowable score:");
               response = getIntOrExit();
          do
               done = true;
               System.out.print("Please enter the minimum allowable score:");
               response = getIntOrExit();
               String allowedMax;
               if(allowedMin == EXIT_PROGRAM)
                    System.exit(0);
               if (response <= ABSOLUTE_MAX_SCORE)
                    done = true;
               else if (response <= ABSOLUTE_MIN_SCORE)
                    done = false;
                    System.out.println("INVALID: " + INVALID_INT);
                    System.out.print("Please enter the maximum allowable score:");
                    response = getIntOrExit();
          }while (!done);
     // The overall strategy to building up a student work object is
     // to have the student-bulding method call on the exam-building
     // method, which calls upon user input methods to get exam info.
     // Thus, user entered info is successively grouped together
     // into bigger units to build the entire student information set.
     // obtainOneStudentsWork() builds the five exams
     // and constructs the student work object from them
     private void obtainOneStudentsWork()
          // *** YOUR CODE GOES HERE ***
          int index = 1;
          Exam exam1 = buildOneExam(index);
          index = 2;
          Exam exam2 = buildOneExam(index);
          index = 3;
          Exam exam3 = buildOneExam(index);
          index = 4;
          Exam exam4 = buildOneExam(index);
          index = 5;
          Exam exam5 = buildOneExam(index);
          thisWork = new OneStudentsWork(exam1, exam2, exam3, exam4, exam5);
     // buildOneExam(thisTest) reads the exam information for one exam and returns an
     // Exam object constructed from this information. Uses obtainWasExamTaken() to
     // determine if the exam was taken and obtainOneScore() to get the exam score, if needed.
     private Exam buildOneExam(int thisTest)
          // *** YOUR CODE GOES HERE ***
          int score = 0;
          if(obtainWasExamTaken(thisTest))
               score = obtainOneScore(thisTest);
          return new Exam(score);
          else
          return new Exam();
          System.out.println("Enter score for exam1:");
          Exam exam1 = new Exam(getIntOrExit());
          System.out.println("Enter score for exam2:");
          Exam exam2 = new Exam(getIntOrExit());
          System.out.println("Enter score for exam3:");
          Exam exam3 = new Exam(getIntOrExit());
          System.out.println("Enter score for exam4:");
          Exam exam4 = new Exam(getIntOrExit());
          System.out.println("Enter score for exam5:");
          Exam exam5 = new Exam(getIntOrExit());
     // obtainWasExamTaken(thisTest) keeps asking the user whether 'thisTest' was taken
     // (e.g., "Was exam 1 taken? Enter Y, N or Q", if thisTest equals 1)
     // until s/he provides a valid response. If Q is entered, we leave the
     // program immediately; if Y or N (yes or no), return true if yes, false if no
     private boolean obtainWasExamTaken(int thisTest)
          // *** YOUR CODE GOES HERE ***
          String response = INVALID_RESPONSE;
          System.out.println("Was Exam" + thisTest + "taken?");
          while (response.equals(INVALID_RESPONSE))
               System.out.println("Please Enter" + " " + YES + " " + NO + " " + "or" + " " + EXIT_PROGRAM);
               response = getYNOrExit();
          if (response.equals(YES))
          return true;
          else
          return false;
     // obtainOneScore(thisTest) keeps asking the user to enter a score for
     // 'thisTest' (e.g., "Enter the score for exam 1", is thisTest equals 1)
     // until s/he provides one within range or s/he tells us to exit the program.
     private int obtainOneScore(int thisTest)
          // *** YOUR CODE GOES HERE ***
          int response = INVALID_INT;
          if (response >= minAllowedScore && response <= maxAllowedScore);
               System.out.println("Enter the Score for Exam" + thisTest + ":");
               response = getIntOrExit();
          while (response > ABSOLUTE_MAX_SCORE || response < ABSOLUTE_MIN_SCORE)
               System.out.println("INVALID: " + INVALID_INT);
               System.out.println("Please Enter again:");
               response = getIntOrExit();
          return response;
     // scoreIsWithinRange() returns true if the given score is inside of
     // the allowable range and false if it is out of range
     private boolean scoreIsWithinRange(int score)
          // *** YOUR CODE GOES HERE ***
          if (score >= minAllowedScore && score <= maxAllowedScore)
               return true;
          else
               return false;
     // getYNQ() reads a String from the console and returns it
     // if it is "Y" or "N" or exits the program if "Q" is entered;
     // the method returns INVALID_RESPONSE if the response is other
     // than"Y", "N" or "Q".
     // Do not modify this code!
     private String getYNOrExit()
          String usersInput = INVALID_RESPONSE;
          try
               usersInput = console.readLine();
          catch (IOException e)
               // never happens with the keyboard...
          usersInput = usersInput.toUpperCase();
          if (usersInput.equals(EXIT_PROGRAM))
               System.out.println("Leaving...");
               System.exit(0);
          if (usersInput.equals(YES) || usersInput.equals(NO))
               return usersInput;
          else
               return INVALID_RESPONSE;
     // getIntOrExit() reads an integer from the console and returns it.
     // If the user types in "Q", the program exits. If an integer is entered,
     // it is returned. If something that is not an integer (e.g. "Alex"), the
     // program returns INVALID_INT
     // Do not modify this code!
     private int getIntOrExit()
          String usersInput = "";
          int theInteger = 0;
          try
               usersInput = console.readLine();
          catch (IOException e)
               // never happens with the keyboard...
          // if the user wants to quit, bail out now!
          if(usersInput.toUpperCase().equals(EXIT_PROGRAM))
               System.out.println("Program halting at your request.");
               System.exit(0);
          // see if we have an integer
          try
               theInteger = Integer.parseInt(usersInput);
          catch (NumberFormatException e)
               // user's input was not an integer
               return INVALID_INT;
          return theInteger;
     //                    -------------------- User output methods --------------------
     // printWelcomeMessage() prints a welcome message to the user explaining
     // what the program does and what it expects the user to do. In
     // particular, it needs to tell the user the absolute lowest and
     // highest acceptable exam scores
     private void printWelcomeMessage()
          // *** YOUR CODE GOES HERE ***
          System.out.println("Welcome!");
          System.out.println("This program computes the average, the variance, and the standard deviation of 5 exams");
          System.out.println("The lowest acceptable score is 0 and the highest is 1000");
     // printResults() prints all of the scores present, then prints the
     // statistics about them. The statistics that can have factional parts
     // -- average, variance and standard deviation -- should be printed with
     // exactly three digits after the decimal point. If a statistic could not be
     // computed, a message to that effect should print (NOT the "phony" value stored
     // in the statistic to tell the program that the statistic could not be computed).
     public void printResults()
          // These statements create a NumberFormat object, which is part
          // of the Java library. NumberFormat objects know how to take
          // doubles and turn them into Strings, formatted in a particular
          // way. First, you tell the NumberFormat object (nf) how you'd like
          // the doubles to be formatted (in this case, with exactly 3
          // digits after the decimal point). When printing a double you call
          // format to format it -- e.g. nf.format(the-number-to-format)
          NumberFormat nf = NumberFormat.getInstance();
          nf.setMinimumFractionDigits(3);
          nf.setMaximumFractionDigits(3);
          // *** YOUR CODE GOES HERE ***
          System.out.println("Score for Exam1 is:" + thisWork.getExam1().getScore());
          System.out.println("Score for Exam2 is:" + thisWork.getExam2().getScore());
          System.out.println("Score for Exam3 is:" + thisWork.getExam3().getScore());
          System.out.println("Score for Exam4 is:" + thisWork.getExam4().getScore());
          System.out.println("Score for Exam5 is:" + thisWork.getExam5().getScore());
          if (thisWork.getStatistics().getMinimum() == Statistics.CANT_COMPUTE_STATISTIC)
               System.out.println("Can't compute the Minimum");
          else
               System.out.println("the Minimum is:" + thisWork.getStatistics().getMinimum());
          if (thisWork.getStatistics().getMaximum() == Statistics.CANT_COMPUTE_STATISTIC)
               System.out.println("Can't compute the Minimum");
          else
               System.out.println("the Maximum is:" + thisWork.getStatistics().getMaximum());
          if (thisWork.getStatistics().getAverage() == Statistics.CANT_COMPUTE_STATISTIC)
               System.out.println("Can't compute the Average");
          else
               System.out.println("the Average is:" + thisWork.getStatistics().getAverage());
          if (thisWork.getStatistics().getVariance() == Statistics.CANT_COMPUTE_STATISTIC)
               System.out.println("Can't compute the Variance");
          else
               System.out.println("the Variance is:" + thisWork.getStatistics().getVariance());
          if (thisWork.getStatistics().getStandardDeviation() == Statistics.CANT_COMPUTE_STATISTIC)
               System.out.println("Can't compute the Standard Deviation");
          else
               System.out.println("the Standard Deviation is:" + thisWork.getStatistics().getStandardDeviation());
// OneStudentsExams.java for Lab 2
// ICS 21 Fall 2002
// OneStudentsWork is the exams and the statistics computed from
// them that comprise one student's work
class OneStudentsWork
     public static final int NUMBER_OF_EXAMS = 5;
     // The student is offered five exams...
     private Exam exam1;
     private Exam exam2;
     private Exam exam3;
     private Exam exam4;
     private Exam exam5;
     // The statistics on those exams
     Statistics studentStats;
     //                    -------------------- Constructor --------------------
     // Takes five constructed exam objects and store them for this student.
     // Constructs a statistics object that holds the stats for these exams and
     // store it in studentStats.
     public OneStudentsWork(Exam test1, Exam test2, Exam test3, Exam test4, Exam test5)
          // *** YOUR CODE GOES HERE ***
          exam1 = test1;
          exam2 = test2;
          exam3 = test2;
          exam4 = test4;
          exam5 = test5;
          studentStats = new Statistics(test1, test2, test3, test4, test5);
     //                    -------------------- Accessor methods --------------------
     // getExamX() methods make available ExamX
     public Exam getExam1()
          return exam1;
     public Exam getExam2()
          return exam2;
     public Exam getExam3()
          return exam3;
     public Exam getExam4()
          return exam4;
     public Exam getExam5()
          return exam5;
     // getStatistics() makes available the Statistics object that is part of this student's work
     public Statistics getStatistics()
          return studentStats;
// Statistics.java for Lab 2
// ICS 21 Fall 2002
// A Statistics object stores the statistics for a group of Exams.
class Statistics
     // This constant denotes a statistic that cannot be
     // computed, such as an average of zero scores or a variance
     // of one score.
     public static final int CANT_COMPUTE_STATISTIC = -9999;
     // The stats
     private int minimum;
     private int maximum;
     private int numberOfExamsTaken;
     private double average;
     private double variance;
     private double standardDeviation;
     //                    -------------------- Constructor --------------------
     // Calculates (initializes) the statistics, using passed-in exams.
     // Note that the order of computing thst stats matters, as some
     // stats use others; for instance, variance must be computed before
     // standard deviation.
     public Statistics(Exam exam1, Exam exam2, Exam exam3, Exam exam4, Exam exam5)
          // *** YOUR CODE GOES HERE ***
          calculateAverage(exam1,exam2,exam3,exam4,exam5);
          calculateVariance(exam1,exam2,exam3,exam4,exam5);
          calculateStandardDeviation(exam1,exam2,exam3,exam4,exam5);
     //                    -------------------- Accessor methods --------------------
     // getNumberOfExamsTaken() makes available the number of exams this student undertook
     public int getNumberOfExamsTaken()
          return numberOfExamsTaken;
     // getMinimum() makes the minimum available
     public int getMinimum()
          return minimum;
     // getMaximum() makes the maximum available
     public int getMaximum()
          return maximum;
     // getAverage() makes the average available
     public double getAverage()
          return average;
     // getVariance() make the variance available
     public double getVariance()
          return variance;
     // getStandardDeviation() make the standard deviation available
     public double getStandardDeviation()
          return standardDeviation;
     //                    -------------------- Statistics methods --------------------
     //     ---> Note: all statistics are to be computed using the number of exams taken
     // calculateNumberOfExamsTaken() computes the number of tests the student took
     // and stores the result in 'numberOfExamsTaken'
     // (Note this statistic can always be computed.)
     private void calculateNumberOfExamsTaken(Exam exam1, Exam exam2, Exam exam3, Exam exam4, Exam exam5)
          // *** YOUR CODE GOES HERE ***
          numberOfExamsTaken = OneStudentsWork.NUMBER_OF_EXAMS;
     // calculateMinimum() sets 'minimum' to the minimum score of exams taken, or
     // to CANT_COMPUTE_STATISTIC if a minimum can't be computed.
     private void calculateMinimum(Exam exam1, Exam exam2, Exam exam3, Exam exam4, Exam exam5)
          // *** YOUR CODE GOES HERE ***
          /*min = exam1.getScore();
          if (min > exam2.getScore())
               min = exam2.getScore();
          if (min > exam3.getScore())
               min = exam3.getScore();
          if (min > exam4.getScore())
               min = exam4.getScore();
          if (min > exam5.getScore())
               min = exam5.getScore();
          if(numberOfExamsTaken == 0)
               minimum = CANT_COMPUTE_STATISTIC;
          else if(numberOfExamsTaken == 1)
               minimum = exam1.getScore();
          else
               minimum = exam1.getScore();
               if(numberOfExamsTaken >= 2 && numberOfExamsTaken <= minimum)
                    minimum = exam2.getScore();
               if(numberOfExamsTaken >= 3 && numberOfExamsTaken <= minimum)
                    minimum = exam3.getScore();
               if(numberOfExamsTaken >= 4 && numberOfExamsTaken <= minimum)
                    minimum = exam4.getScore();
               if(numberOfExamsTaken >= 5 && numberOfExamsTaken <= minimum)
                    minimum = exam5.getScore();
          if (getMinimum() == ExamsManager.ABSOLUTE_MIN_SCORE)
               minimum = exam1.getScore();
               //exam1.getScore() = getMinimum();
          else
               exam1.getScore() = CANT_COMPUTE_STATISTIC;
     // calculateMaximum() sets 'maximum' to the maximum score of exams taken, or
     // to CANT_COMPUTE_STATISTIC if a maximum can't be computed.
     private void calculateMaximum(Exam exam1, Exam exam2, Exam exam3, Exam exam4, Exam exam5)
          // *** YOUR CODE GOES HERE ***
          /*if (maximum == ExamsManager.ABSOLUTE_MAX_SCORE)
          return true;
          else
          return CANT_COMPUTE_STATISTIC;*/
          max = exam1.getScore();
          if (max < exam2.getScore())
               max = exam2.getScore();
          if (max < exam3.getScore())
               max = exam3.getScore();
          if (max < exam4.getScore())
               max = exam4.getScore();
          if (max < exam5.getScore())
               max = exam5.getScore();
          if(numberOfExamsTaken == 0)
               maximum = CANT_COMPUTE_STATISTIC;
          else if(numberOfExamsTaken == 1)
               maximum = exam1.getScore();
          else
               maximum = exam1.getScore();
               if(numberOfExamsTaken >= 2 && numberOfExamsTaken >= maximum)
                    maximum = exam2.getScore();
               if(numberOfExamsTaken >= 3 && numberOfExamsTaken >= maximum)
                    maximum = exam3.getScore();
               if(numberOfExamsTaken >= 4 && numberOfExamsTaken >= maximum)
                    maximum = exam4.getScore();
               if(numberOfExamsTaken >= 5 && numberOfExamsTaken >= maximum)
                    maximum = exam5.getScore();
     // calculateAverage() computes the average of the scores for exams taken and
     // stores the result in 'average'. Set to CANT_COMPUTE_STATISTIC if there
     // are no tests taken.
     private void calculateAverage(Exam exam1, Exam exam2, Exam exam3, Exam exam4, Exam exam5)
          // *** YOUR CODE GOES HERE ***
          if (numberOfExamsTaken == 5)
               average = (exam1.getScore()+exam2.getScore()+exam3.getScore()+exam4.getScore()+exam5.getScore()/OneStudentsWork.NUMBER_OF_EXAMS);
          else if (numberOfExamsTaken == 4)
               average = (exam1.getScore()+exam2.getScore()+exam3.getScore()+exam4.getScore()/OneStudentsWork.NUMBER_OF_EXAMS);
          else if (numberOfExamsTaken == 3)
               average = (exam1.getScore()+exam2.getScore()+exam3.getScore()/OneStudentsWork.NUMBER_OF_EXAMS);
          else if (numberOfExamsTaken == 2)
               average = (exam1.getScore()+exam2.getScore()/OneStudentsWork.NUMBER_OF_EXAMS);
          else if (numberOfExamsTaken == 1)
               average = (exam1.getScore()/OneStudentsWork.NUMBER_OF_EXAMS);
          else if (numberOfExamsTaken == 0)
               average = CANT_COMPUTE_STATISTIC;
     // calculateVariance() calculates the returns the variance of the
     // scores for exams taken and stores it in 'variance'
     // For a small set of data (such as this one), the formula for calculating variance is
     // the sum of ((exam score - average) squared) for scores of exams taken
     // divided by (the number of scores - 1)
     // Set to CANT_COMPUTE_STATISTIC if there are fewer than two tests taken.
     private void calculateVariance(Exam exam1, Exam exam2, Exam exam3, Exam exam4, Exam exam5)
          // *** YOUR CODE GOES HERE ***
          if (numberOfExamsTaken == 5)
               variance = ((exam1.getScore()-average)*(exam1.getScore()-average)+(exam2.getScore()-average)*(exam2.getScore()-average)+(exam3.getScore()-average)*(exam3.getScore()-average)+(exam4.getScore()-average)*(exam4.getScore()-average)+(exam5.getScore()-average)*(exam5.getScore()-average))/4;
          else if (numberOfExamsTaken == 4)
               variance = ((exam1.getScore()-average)*(exam1.getScore()-average)+(exam2.getScore()-average)*(exam2.getScore()-average)+(exam3.getScore()-average)*(exam3.getScore()-average)+(exam4.getScore()-average)*(exam4.getScore()-average))/4;
          else if (numberOfExamsTaken == 3)
               variance = ((exam1.getScore()-average)*(exam1.getScore()-average)+(exam2.getScore()-average)*(exam2.getScore()-average)+(exam3.getScore()-average)*(exam3.getScore()-average))/4;
          else if (numberOfExamsTaken == 2)
               variance = ((exam1.getScore()-average)*(exam1.getScore()-average)+(exam2.getScore()-average)*(exam2.getScore()-average))/4;
          else if (numberOfExamsTaken < 2)
               variance = CANT_COMPUTE_STATISTIC;
     // calculateStandardDeviation() calculates the standard
     // deviation of the scores of taken exams and stores
     // it in 'standardDeviation'
     // The formula for calculating standard deviation is just
     // the square root of the variance
     private void calculateStandardDeviation(Exam exam1, Exam exam2, Exam exam3, Exam exam4, Exam exam5)
          // *** YOUR CODE GOES HERE ***
          if (variance == CANT_COMPUTE_STATISTIC)
               standardDeviation = CANT_COMPUTE_STATISTIC;
          else
               standardDeviation = (Math.sqrt(variance));
// Exam.java for Lab 2
// ICS 21 Fall 2002
// An Exam object stores information about one exam
class Exam
     private boolean examTaken;     //was the exam taken? true for yes, false for no
     private int score;               //the exam's score; = 0 if test not taken
     //                    -------------------- Constructors --------------------
     // Construct a taken exam; it has score 's'
     public Exam(int s)
          score = s;
          examTaken = true;
     // Construct an exam not taken; it has a score of 0
     public Exam()
          score = 0;
          examTaken = false;
     //                    -------------------- Accessor methods --------------------
     // Make the score of an exam available
     public int getScore()
          return score;
     // Make available whether an exam was taken
     public boolean wasTaken()
          return examTaken;

Your code is absolutely unreadable - even if someone was willing to
help, it's simply impossible. I do give you a few tips, though: If you
understand your code (i.e. if it really is YOUR code), you should be
able to realize that your minimum and maximum never get set (thus they
are both 0) and your exam 3 is set with the wrong value. SEE where
those should get set and figure out why they're not. Chances are you
are doing something to them that makes one 'if' fail or you just
erroneously assign a wrong variable!

Executing a Java -- program.class

1234JLG - Please help me resolve this hurdle. I do JAVAC and generate a Class, that I can display with NOTEPAD, but when I do JAVA, what I receive is ...
Error occurred during initialization of VM
java/lang/NoClassDefFoundError: java/lang/object
Thank You So Much.

This is thrown if the Java Virtual Machine tries to load in the class and no definition of the class could be found.
Make sure the path to the class is correct or execute from same directory.

HTTP connection between two java programs(classes)

Hello everyone,
here's my question:
I need to create two java applications(just two console apps) that can exchange data with each other only via the HTTP protocol. I guess I have to use the URLConnection class. How can I do that? Basically I need to make one app work as a server and the other one just as a simple client.
thanks in advance

URLConnection.
As for the server, you could use a Servlet. There are Java libraries that act as a servlet container without requiring installation. Jetty comes to mind.

Java Programming - classes and lists

Hi.
I have been given a problem to java problem to solve. I have written most of the code but I am unsure of where to go from here.
Could I please email someone my problem, someone who might be able to help?
I would rather not post the details on here. (I know that sounds stupid, as I came here for help, but I would rather do it privately.)
Any help would be greatly appreciated.

this site only.:)
Regards
manu

New Java Programming Student Needs Help

Hey everyone,
I've just started taking a Java programming class at Penn State University, and I have had some prior experience with programming, i.e. C, C++, HTML, SQL. However, this will be my first attempt at Java. I know there are a lot of similarities between C++ and Java, but I'm still a little lost on some methodology.
To get myself going, I've been looking through the textbook a little and came across a problem that gave me some difficulty. I'll write out the outline:
A company pays its employees as managers (who receive a fixed weekly salary), hourly workers (who receive a fixed hourly wage for up to the first 40 hours they work and time and a half (i.e. 1.5 times their hourly wage) for overtime hours worked, commission workers (who receive $250 plus 5.7% of their gross weekly sales), and pieceworkers (who receive a fixed amount of money per item for each of the items they produce � each pieceworker in this company works on only one type of item).
+Define a Java class named EmployeePayment that includes functionality to compute the weekly pay for each employee. You do not know the number of employees in advance. Each type of employee has its own pay code: Managers have paycode 1, hourly workers have paycode 2, commission workers have paycode 3 and pieceworkers have paycode 4.+
+Define a main method that creates an instance of the EmployeePayment class, and calls the setManagerPay method to set the managers weekly salary to $625.00. The main method should then prompt the user for the paycode ��Enter paycode (-1 to end): �, validate the input and perform the associated processing for that paycode. Your program should allow the user to process employees until a paycode of -1 has been entered. Use a switch structure to compute each employee�s pay, based on the employee�s paycode. Within the switch, prompt the user (i.e. the payroll clerk) to enter the appropriate facts your program needs to calculate each employee�s pay based on that employee�s paycode, invoke the respective method (defined below) to perform the calculations and return the weekly pay for each type of employee, and print the returned weekly pay for each employee.+
+Define a setManagerPay method that accepts and stores the fixed weekly salary value for managers.+
+A private instance variable weeklyManagerPay should be defined in the EmployeePayment class to support these accessor and mutator methods.+
+Define a calcManagerPay method that has no parameters and returns the fixed weekly salary.+
+Define a calcHourlyWorkerPay method that accepts the hourly salary and total hours worked as input parameters and returns the weekly pay based on the hourly worker pay code description.+
+Define a calcCommWorkerPay method that accepts the gross weekly sales as an input parameter and returns the weekly pay based on the commission worker pay code description.+
+Define a calcPieceWorkerPay method that accepts the number of pieces and wage per piece as input parameters and returns the weekly pay based on the piece worker pay code description.+
+Once all workers have been processed, the total number of each type of employee processed should be printed. Define and manage the following private instance variables (*numManager*, numHourlyWorker, numCommWorker, and numPieceWorker) within the EmployeePayment class. What are the ways in which these variables can be updated?+
Sorry for the length, but I wanted this to be thorough. Basically, I'm having the most trouble writing the switch statement, and outputting the total number of each type of employee...
Any help and pointers will be greatly appreciated...thanks all.

You said you've written C and C++ code before. I don't have an excellent memory but from the little code that I wrote in C, I believe the switch statement is exactly the same.
Read this: [http://java.sun.com/docs/books/tutorial/java/nutsandbolts/switch.html]
If you're having trouble understanding something post what your specific problem is. No one is going to write your homework for you, but many, myself included, would be more than willing to help if you're really stumped. Just post your concise problem.
Edited by: sheky on Mar 12, 2008 9:52 PM

Integrating native C++ class in a java program

Hello,I have a class written in C++, such as this one, myclass.cpp and myclass.h:
myclass.cpp:
#include <iostream.h>
#include "myclass.h"
myclass::myclass( int x ) {
cout << "Class created with " << x << " parameter" << endl;
void myclass:message( char *message ) {
cout << "Message: " << message << endl;
and the myclass.h is:
#ifndef MYCLASS
#define MYCLASS
class myclass {
public:
myclass( int );
void message( char * );
#endif
I want to create a java program that calls this C++ class, in which I can write the "message" and the "x"...
how can I do it?
thanx

I am afraid I do not know the coding conventions for other systems than Windows (well, not anymore).
I can only tell you, though, how I do that in C++ for Windows.
1. I write the function signatures in Java:
public class JavaClass{
public native type_fun name_fun(param_list);
2. In the same class, I make a static contructor:
static {
System.loadLibrary("library_name");
// !!! no extenstion! only the name of the dll (or shared library)
3. I compile with javac.
4. I generate a header:
javah -jni JavaClass
This makes a file JavaClass.h - if everything works well.
5. I provide an implementation for the function(s) in this header, in a file JavaClass.cpp. In the cpp file, I include the header which declares your C++ class. In the implementation of the (exposed) function, I create an instance of that class.
6. I compile the C++ part and make a dll out of it; I make sure that this dll is in a directory which is in the $path (%path%) environment variable.
That's it.
I think, though, that this process is described in one of the online tutorials.
Petru

Java Program in MDM to call a standard java class

Hi All,
In MDM- GDS, (Global Data Synchronization), we have a scenario where, once we register the Items , it will be transported to a Data Pool called 1SYNC through SAP PI.
There is a standard Java PRoxy(Kind of java Class) in MDM, which will be triggered once we register the Item in MDM-GDS.
That Java Proxy will send the Item INfo as a XML message to PI.
So we would like to know whether its possible to automate this process.
Like,Writing a new Java Program which will check all the new items and trigger the Java Proxy and send these items as XML Messages to PI.
I m new to MDM. So it would be really helpful, If i could get some inputs on this. Like, is it possible in MDM. If so, how?

Aarthi,
you can acheive this from MDM itself, and need not to write any Java proxy.
you may consider following logic.
Create a field with the Name Status and Initilize it with Value "new". Now define syndicaiton Map to syndicate records which holds value "new" in the status field. define a workflow with syndication step, using maps defined earlier. After syndication step, execute an assignment to change Status field value from "New" to "Syndicated".
Revert back if any question.
~ Shiv

How to call a java program in javafx class(Urgent) and even vice versa

Hi all,
Here I have two questions:
1)
Please let me know how to call a javafx in java program...
I tried with the following code but it is not working..
The below is the java program in which I made a call to the Fx program.
FxMainLauncher.java
import net.java.javafx.FXShell;
public class FxMainLauncher {
public static void main(String[] args) throws Exception {
FXShell.main(new String[] {"HelloWorld.fx"});
2) How to call a java program in javafx class
Here is my javafx program
import check.*;
import javafx.ui.*
var instance = new MyJava();
//visible:true
System.out.println("Number is: {instance}");
Here is my java program
public class MyJava {
public static void main(String args[])
System.out.println("JAVAFX TO JAVA");
Even this is not working please let me know ASAP
Thanks in advance,
V.Srilakshmi

GOT IT !!!
I had to change the name of the method in .h file generated by javah command. On doing
javac -d ../../classes HelloWorld.java
go to the ../../classes directory (where you have the class file) and do
javah HelloWorld
I got a HelloWorld.h file in which I had
JNIEXPORT void JNICALL Java_HelloWorld_display(JNIEnv *, jobject);
I added the package name too:
JNIEXPORT void JNICALL Java_GUI_HelloWorld_display(JNIEnv *, jobject);
The HelloWorldImp.c file should have the same name (ie with package) and be in the same directory(ie ../../classes)
compile and build the shared library to get "libhello.so" file
gcc -c -fPIC -I/usr/lib/j2sdk1.3/include -I/usr/lib/j2sdk1.3/include/linux HelloWorldImp.c
gives .o file
gcc -shared -o libhello.so HelloWorldImp.o
gives .so file
then run java with the command in my first message. It works.
Thanks for the reply "thedracle".

My java program runs fine even if i don't specify access specifier of class

Hi,
My java program runs fine even if i don't specify access specifier of class as public .
Then why do they say that atleast one class should be specified as public.
please help.

public access specifier is the default access
specifier
so if you dont give the access specifier before the
class name it is not wrong.I think that you are wrong. The default specifier is package or "package-private".
See here:
http://java.sun.com/docs/books/tutorial/java/javaOO/accesscontrol.html
Message was edited by:
petes1234

JSP Unable to Load Class (posted in Java Programming for 5 Dukes)

I hope this isn't a violation of forum etiquette, but I posted my question in Java Programming at http://forum.java.sun.com/thread.jsp?forum=31&thread=203255
I realize now that it may have been wiser to post it here, but I have some replies already and it makes more sense just to inlcude the link.
Can anyone assist with the question at http://forum.java.sun.com/thread.jsp?forum=31&thread=203255
It's worth 5 dukes.

Try changing <tagclass>E:\Tomcat324\jakarta-tomcat-3.2.4\webapps\examples\WEB-INF\classes\tags.ExampleTag</tagclass> to <tagclass>tags.ExampleTag</tagclass>
because <tagclass> tag is for the class name and not the location of class file
And make sure your ExampleTag.class file is in
\WEB-INF\classes\tag\ExampleTag.class
B!

Difference between a java program and a java class

Hi there,
What is the difference between a java program and a java class?

HI,
A java class is an object - described in a .class file - which has been given properties and behaviours and which can be instantiated in a program.
A java program( application ) consists of at least one class (one of which must be declared public) and which executes its main() method ( of the public class ) when it is started.
Every program is a class but not every class is a program.
Examples:
A java program
// this simple program will print out the first command line argument you put
// in after calling : java ScreenWriter "arguments"
class ScreenWriter
public static void main( String [] args )
if( args.length > 0 )
System.out.println( args[0] );
A java class
//the Math class is already defined in the java.lang package
//and contains a constant for PI
//So I can include the Math class with the PI constant in my simple program
//and now I have a program that involves my ScreenWriter class and the Math class too.
class ScreenWriter
public static void main( String [] args )
if( args.length > 0 )
System.out.println( args[0] );
System.out.println( "The value of Pi is: " + Math.PI );
When you see package and import declarations at the start of a program they are there to ensure the compiler knows which classes are used in the program.
Hope that helps,
Terry

Error while running a Java Program

Can anyone help me,
I am getting the following error while running a Java program, Below is the exception thrown, please help.
java.nio.BufferOverflowException
at java.nio.Buffer.nextPutIndex(Buffer.java:425)
at java.nio.DirectByteBuffer.putChar(DirectByteBuffer.java:463)
at org.jetel.data.StringDataField.serialize(StringDataField.java:295)
at org.jetel.data.DataRecord.serialize(DataRecord.java:283)
at org.jetel.graph.DirectEdge.writeRecord(DirectEdge.java:216)
at org.jetel.graph.Edge.writeRecord(Edge.java:288)
at com.tcs.re.component.RESummer1.run(RESummer1.java:505)
java.nio.BufferOverflowException
at java.nio.Buffer.nextPutIndex(Buffer.java:425)
at java.nio.DirectByteBuffer.putChar(DirectByteBuffer.java:463)
at org.jetel.data.StringDataField.serialize(StringDataField.java:295)
at org.jetel.data.DataRecord.serialize(DataRecord.java:283)
at org.jetel.graph.DirectEdge.writeRecord(DirectEdge.java:216)
at org.jetel.graph.Edge.writeRecord(Edge.java:288)
at com.tcs.re.component.RECollectCont.run(RECollectCont.java:304)

Ok, let's see. Write the following class:
public class Grunt {
public static void main(String[] args) {
System.out.println("Hello Mars");
}Save it as "C:\Grunt.java", compile by typing:
javac c:\Grunt.javaRun by typing:
java -classpath "C:\" GruntDoes it say "Hello Mars"? If yes, go back to your program and compare for differences (maybe you used the "package" statement?).
Regards

Running a java program

This shows how dumb i am.
I have a java program all wrote. How can i run it without using the compiler? Can i have a .exe file or something that I just have to click on to run??
Thanks again
Agdude

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and Settings\awaguespack>cd jbproject\untitled1\classes\untitled1
C:\Documents and Settings\awaguespack\jbproject\untitled1\classes\untitled1>java
form
Exception in thread "main" java.lang.NoClassDefFoundError: form (wrong name: unt
itled1/form)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
C:\Documents and Settings\awaguespack\jbproject\untitled1\classes\untitled1>dir
Volume in drive C has no label.
Volume Serial Number is C065-81CA
Directory of C:\Documents and Settings\awaguespack\jbproject\untitled1\classes\
untitled1
07/24/2003 02:21 PM <DIR> .
07/24/2003 02:21 PM <DIR> ..
07/24/2003 02:21 PM 7,655 form.class
1 File(s) 7,655 bytes
2 Dir(s) 36,031,016,960 bytes free
C:\Documents and Settings\awaguespack\jbproject\untitled1\classes\untitled1>echo
%classpath%
%classpath%
C:\Documents and Settings\awaguespack\jbproject\untitled1\classes\untitled1>

Running a java program at "Start Up"

Besides running an html file with an applet in it. Are there any simple ways to launch a java program every time the computer is turned on.
I am not asking for specific directions, but rather just an idea, and i will go find my own guide.

Well two ideas (if ur on windows) u could try are -
one, if you had a class file you could simply create a
batch file on windows that says java <class> and then
put that batch file in your startup so that the class
is run at startup or else you could think of modifying
the registry keys on windows to run this class at
startup - whichever works for you.Or you could just jar the program up, adding a Main-Class indicator in the manifest, and then add a shortcut to the jar to the startup folder, as someone else stated. Theres little need to go messing around with DOS batch in modern windows.

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