Int to Integer
how to convert int value to Integer value?
Thanks.
running the risk of sounding stupid
what's the difference?Sir,
An int is a primitive. An Integer is an object. Specifically a wrapper object for the primitive type int.
Java has both objects and primitives.
Sincerely,
Slappy
Similar Messages
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How to convert an int array to Integer[] without iterating the int[]?
we can traverse the int[] and add to Integer[]. But the traversing takes too much time. Is there any method to do the above conversion?If you are using 1.5, you can use the individual elements of the int[] as if they were an Integer, so why do you need to convert it? If it is to pass the array as an argument, then sorry, you are going to have to traverse the arrays and set the elements. And, at most, this will take a second or two of time (even if you have an array of nearly max size), so in what way is this "taking too much time"?
Edit: And any API method to do this with a single line of code, would still, inside the method, need to traverse the arrays, so now time would be saved. If it is to save programming time, then take a few minutes to write a method for it now, and then every time you need it in the future, just use that method. -
Having a problem with my entity bean.......... I have set my primary key type to type java.lang.Integer.... my ejbCreate is returning an Integer but when i try to compile is says that type int is required. i cannot change it to an int as the primary key has to be an object and it will not deploy. Why is it asking for an int? what is asking the the ejbCreate for an int? any help!
Hi,
If you are doing an insert within your create you should have something like this...
pstmt.setInt(1,ID.intValue() );Where pstmt is the PreparedStatement for the insert! Send ur code so I can understand what your trying to do.
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String.valueOf(int i) / Integer.toString()
What's the difference between these methods? They seem to both do the same thing... convert an int into a string
No, they don't
static String valueOf(int i)
Returns the string representation of the int argument.
String toString()
Returns a String object representing this Integer's value. Perhaps you intended to compare the String.valueOf to this?
static String toString(int i)
Returns a String object representing the specified integer. If so, then yes, they do the same thing. -
whats the difference between these two anyway..?
int is a primitive type and Integer is a class. You would generally use primitive types wherever possible because they are much more efficient. You would use classes, for instance, if you have to put your values into a collection such as an ArrayList.
-
Fundamental Question about int vs Integer
I don't really understand what the difference is between using the "int" keyword and using the Integer type. I've come to realise that "int" cannot be null whereas Integer can be null but why isn't int just an Integer type? Like an alias of sorts. I realise this a fairly basic question but I'm sure I'm not the only one pondering this :)
I'm not sure if the autoboxing stuff in 1.5 affects
this at all or not, but one key difference between
objects and primitives is that primitives get passed
by value, whereas objects are passed by reference.
NOOOOOOOOOOOOOO!
Wrong. Wrong. Wrong. Wrong. Wrong.
Everything in Java is passed "by value". Everything.
Pass-by-value
- When an argument is passed to a function, the invoked function gets a copy of the original value.
- The local variable inside the method declaration is not connected to the caller's argument; any changes made to the values of the local variables inside the body of the method will have no effect on the values of the arguments in the method call.
- If the copied value in the local variable happens to be a reference (or "pointer") to an object, the variable can be used to modify the object to which the reference points.
Some people will say incorrectly that objects are passed "by reference." In programming language design, the term pass by reference properly means that when an argument is passed to a function, the invoked function gets a reference to the original value, not a copy of its value. If the function modifies its parameter, the value in the calling code will be changed because the argument and parameter use the same slot in memory.... The Java programming language does not pass objects by reference; it passes object references by value. Because two copies of the same reference refer to the same actual object, changes made through one reference variable are visible through the other. There is exactly one parameter passing mode -- pass by value -- and that helps keep things simple.
-- James Gosling, et al., The Java Programming Language, 4th Edition -
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Integer MyInteger = new Integer(rs.getInt(3));
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Unsigned int to integer conversion
Hi,
I have an unsigned integer column in my database table. If I try to retreive the value of the column using resultset.getInt() I'm getting "Numeric value overflow" error as it exceeds the INT_MAX value.
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How to convert an Integer to int
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It's mid nite and I'm still at work!
Appreciate all help. Thanks!Integer is an Object. int is a primitive base type. to convert an Integer Object into an int:
//let's say you read a line from a file, and the line is this
5
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Converting Integer to int - Junit
Hello
I have a problem with a Junit test case. The search function did not return any helpful results, so I'm trying my luck here.
I'm using Junit 4.4 and JDK1.6.0_01
My class which I would like to test looks like this:
public class SortedIntArrayList<Integer> extends ArrayList<Integer> {
public SortedIntArrayList(){
super();
/* adds an integer val such that the list is
always sorted in ascending order
public void addInt(Integer val){
// @TODO implementation will follow
}and this is my test class
public class SortedIntArrayListTest extends TestCase {
private SortedIntArrayList<Integer> saExp = new SortedIntArrayList<Integer>();
private SortedIntArrayList<Integer> saAct = new SortedIntArrayList<Integer>();
@Override
public void setUp(){
// set up the actual sortedIntArrayList
saAct.add(-6);
saAct.add(2);
saAct.add(9);
saAct.add(22);
saAct.add(69);
// set up the expected sortedIntArrayList
saExp.add(-6);
saExp.add(2);
saExp.add(9);
saExp.add(22);
saExp.add(69);
// add an element at the beginning of the arraylist
public void testAddIntFirstElement(){
int val = -10;
this.saAct.add(0,val);
this.saExp.addInt(new Integer(val));
assertEquals(saAct,saExp);
}Now to my problem.
I'm trying to create a method addInt(Integer) in my SortedIntArrayList class, such that the resulting arrayList will be ordered.
In my addInt(Integer val) method I want to get the int value from the val Integer object to compare it to the values already in the arrayList.
What I tried to do:
public void addInt(Integer val){
if(this.get(0).intValue()<val.intValue()){
// do something
}Does not work! Also, Integer.parseInt and all these Integer methods do not show up.
When I open a new project and try something like
public static void main(String[] args) {
int i;
Integer itgr = new Integer(10);
i = itgr.intValue();
}it does work.
What am I doing wrong? By the way, I tried it in Eclipse as well as in NetBeans.
Thanks for your help
Greetings, David
Edit: Well, after some research I found out that my actual problem is that I cannot Instantiate Integer in my extended class like:
Integer i = new Integer(30);
message: cannot instantiate integer.
Any ideas why that is?
Edited by: strad on Nov 9, 2007 8:43 AMIt sounds like you've defined a class and named it .... Integer! So the compiler thinks "Integer" is your class and not java.lang.Integer.
Solution: rename or get rid of your Integer class, or be forced to write this everywhere:
java.lang.Integer x = new java.lang.Integer(42); -
How to switch a decimal integer to a hexadecimal int?
How to switch a decimal integer to a hexadecimal int? And contrary too?
If you are talking about String representations of integers, you can use the methods in java.lang.Integer:
For example, to convert from hexadecimal notation to an int-value you can use:
int x = Integer.parseInt("FF00E", 16); // Radix 16To convert an int value to to hexadecimal notation use:
String x = Integer.toHexString(1778);Søren -
Hello.
Just for couriosity I'd like to calculate the length of an int and by that I mean return the number of digits.
I know how to do this 'manually', but is there a method somewhere that looks a bit like this:
object.calcInt(47653);//returns 5Thanks in advanceInteresting. Nobody likes the log method even though it is 30% faster.
public class Garbage
public static final int FIRST_INT = Integer.MAX_VALUE - 10000;
public static final int LAST_INT = Integer.MAX_VALUE;
public static final int TESTS = 1000;
public static void main(String args[])
long divideTestTime = 0;
long stringTestTime = 0;
long logTestTime = 0;
DivideTest divideTest = new DivideTest();
StringTest stringTest = new StringTest();
LogTest logTest = new LogTest();
for (int i = 0; i < TESTS; i++)
divideTestTime += runTest(divideTest);
stringTestTime += runTest(stringTest);
logTestTime += runTest(logTest);
System.out.println("Divide-test Time: " + divideTestTime);
System.out.println("String-test Time: " + stringTestTime);
System.out.println("Log-test Time: " + logTestTime);
public static long runTest(Test test)
long start = System.currentTimeMillis();
for (int i = FIRST_INT; i < LAST_INT; i++)
test.lengthOf(i);
return System.currentTimeMillis() - start;
interface Test {
public int lengthOf(int i);
class DivideTest implements Test {
public int lengthOf(int i) {
int size = 0;
do {
size++;
i /= 10;
} while(i > 0);
return size;
class StringTest implements Test {
public int lengthOf(int i) {
return String.valueOf(i).length();
class LogTest implements Test
private static final double l210 = Math.log(10);
public int lengthOf(int i) {
return (int)(1 + (Math.log(0.5 + i) / l210));
} -
Upon compiling, I am receiving the following errors:
TeamRosterApp.java:153: cannot find symbol
symbol : class ButtonPanel
location: class TeamRosterPanel
ButtonPanel buttonPanel;
^
TeamRosterApp.java:166: cannot find symbol
symbol : class ButtonPanel
location: class TeamRosterPanel
buttonPanel = new ButtonPanel();
^
2 errors
I've included the code below, but I having difficulty understanding why it cannot find the ButtonPanel class when that class is specified in the code (Line 364).
Thanks in advance for your help!
//Modified by Doe, John 20OCT2007
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.JTextComponent;
import java.util.ArrayList;
import java.text.*;
import java.lang.*;
import java.util.*;
public class TeamRosterApp
public static void main(String[] args)
TeamIO.getTeam();
JFrame frame = new TeamRosterFrame();
frame.setVisible(true);
class Player
String lname;
String fname;
int number;
public Player()
lname = "";
fname = "";
number = 0;
public Player(String lname, String fname, int number)
this.lname = lname;
this.fname = fname;
this.number = number;
public void setLastName(String lname)
this.lname = lname;
public String getLastName()
return lname;
public void setFirstName(String fname)
this.fname = fname;
public String getFirstName()
return fname;
public void setNumber(int number)
this.number = number;
public int getNumber()
return number;
class TeamIO
private static final ArrayList<Player> team = new ArrayList<Player>();
public static ArrayList<Player> getTeam()
team.add(new Player("Doe", "John", 69));
team.add(new Player("Berg", "Laura", 44));
team.add(new Player("Bustos", "Crystl", 6));
team.add(new Player("Clark", "Jamie", 24));
team.add(new Player("Fernandez", "Lisa", 16));
team.add(new Player("Finch", "Jennie", 27));
team.add(new Player("Flowers", "Tairia", 11));
team.add(new Player("Freed", "Amanda", 7));
team.add(new Player("Giordano", "Nicole", 4));
team.add(new Player("Harrigan", "Lori", 21));
team.add(new Player("Jung", "Lovieanne", 3));
team.add(new Player("Kretchman", "Kelly", 12));
team.add(new Player("Lappin", "Lauren", 37));
team.add(new Player("Mendoza", "Jessica", 2));
team.add(new Player("O'Brien-Amico", "Lisa", 20));
team.add(new Player("Nuveman", "Stacy", 33));
team.add(new Player("Osterman", "Catherine", 8));
team.add(new Player("Topping", "Jennie", 31));
team.add(new Player("Watley", "Natasha", 29));
System.out.println("\nOpening team list" + "\n\n" + "****************************************");
for(int i = 0; i < team.size(); i++)
Player p = (Player)team.get(i);
System.out.print(p.getNumber() + "\t" + p.getLastName() + "," + p.getFirstName() + "\n");
System.out.println("****************************************");
return new ArrayList<Player>(team);
public static ArrayList<Player> saveTeam()
System.out.println("\nOpening team list" + "\n\n" + "****************************************");
for(int i = 0; i < team.size(); i++)
Player p = (Player)team.get(i);
System.out.print(p.getNumber() + "\t" + p.getLastName() + "," + p.getFirstName() + "\n");
System.out.println("****************************************");
return new ArrayList<Player>(team);
class TeamRosterFrame extends JFrame
public TeamRosterFrame()
String me = "Campbell, Corey";
String date;
Date now = new Date();
DateFormat longDate = DateFormat.getDateInstance(DateFormat.LONG);
date = longDate.format(now);
setTitle("Team Roster "+me+" "+date);
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.add(new TeamRosterPanel());
this.pack();
centerWindow(this);
private void centerWindow(Window w)
Toolkit tk = Toolkit.getDefaultToolkit();
Dimension d = tk.getScreenSize();
setLocation((d.width-w.getWidth())/2, (d.height-w.getHeight())/2);
class TeamRosterPanel extends JPanel
ArrayList<Player>team;
Player newPlayer = null;
teamSelectorPanel selectorPanel;
PlayerDisplayPanel playerPanel;
ButtonPanel buttonPanel;
public TeamRosterPanel()
// fill the team ArrayList
team = TeamIO.getTeam();
// add the panels
setLayout(new GridBagLayout());
selectorPanel = new teamSelectorPanel();
add(selectorPanel, getConstraints(0,0,1,1, GridBagConstraints.WEST));
playerPanel = new PlayerDisplayPanel();
add(playerPanel, getConstraints(0,1,1,1, GridBagConstraints.EAST));
buttonPanel = new ButtonPanel();
add(buttonPanel, getConstraints(0,2,1,1, GridBagConstraints.EAST));
// set the initial player to be displayed
playerPanel.showPlayer(team.get(0));
selectorPanel.selectPlayer(team.get(0));
// a method for setting grid bag constraints
private GridBagConstraints getConstraints(int gridx, int gridy,
int gridwidth, int gridheight, int anchor)
GridBagConstraints c = new GridBagConstraints();
c.insets = new Insets(5, 5, 5, 5);
c.ipadx = 0;
c.ipady = 0;
c.gridx = gridx;
c.gridy = gridy;
c.gridwidth = gridwidth;
c.gridheight = gridheight;
c.anchor = anchor;
return c;
class teamSelectorPanel extends JPanel implements ActionListener
public JComboBox playerComboBox;
private JLabel playerLabel;
boolean filling = false; // used to indicate the combo box is being filled
public teamSelectorPanel()
// set panel layout
setLayout(new FlowLayout(FlowLayout.LEFT));
// Player label
playerLabel = new JLabel("Select Player:");
add(playerLabel);
// Player combo box
playerComboBox = new JComboBox();
fillComboBox(team);
playerComboBox.addActionListener(this);
add(playerComboBox);
public void actionPerformed(ActionEvent e)
if (!filling)
Player p = (Player)playerComboBox.getSelectedItem();
playerPanel.showPlayer(p);
public void fillComboBox(ArrayList<Player> team)
filling = true;
playerComboBox.removeAllItems();
for (Player p : team)
playerComboBox.addItem(p);
filling = false;
public void selectPlayer(Player p)
playerComboBox.setSelectedItem(p);
public Player getCurrentPlayer()
return (Player) playerComboBox.getSelectedItem();
class PlayerDisplayPanel extends JPanel
public JTextField lastNameTextField,
firstNameTextField,
numberTextField;
private JLabel lastNameLabel,
firstNameLabel,
numberLabel;
public PlayerDisplayPanel()
// set panel layout
setLayout(new GridBagLayout());
// last name label
lastNameLabel = new JLabel("Last name:");
add(lastNameLabel, getConstraints(0,0,1,1, GridBagConstraints.EAST));
// last name text field
lastNameTextField = new JTextField(10);
lastNameTextField.setEditable(false);
lastNameTextField.setFocusable(false);
lastNameTextField.addFocusListener(new AutoSelect());
add(lastNameTextField, getConstraints(1,0,1,1, GridBagConstraints.WEST));
// first name label
firstNameLabel = new JLabel("First name:");
add(firstNameLabel, getConstraints(0,1,1,1, GridBagConstraints.EAST));
// first name text field
firstNameTextField = new JTextField(30);
firstNameTextField.setEditable(false);
firstNameTextField.setFocusable(false);
firstNameTextField.addFocusListener(new AutoSelect());
add(firstNameTextField, getConstraints(1,1,1,1, GridBagConstraints.WEST));
// number label
numberLabel = new JLabel("Number:");
add(numberLabel, getConstraints(0,2,1,1, GridBagConstraints.EAST));
// number text field
numberTextField = new JTextField(10);
numberTextField.setEditable(false);
numberTextField.setFocusable(false);
numberTextField.addFocusListener(new AutoSelect());
numberTextField.addKeyListener(new IntFilter());
add(numberTextField, getConstraints(1,2,1,1, GridBagConstraints.WEST));
public void showPlayer(Player p)
lastNameTextField.setText(p.getLastName());
firstNameTextField.setText(p.getFirstName());
numberTextField.setText(String.valueOf(p.getNumber()));
public void clearFields()
lastNameTextField.setText("");
firstNameTextField.setText("");
numberTextField.setText("");
// return a new Player object with the data in the text fields
public Player getPlayer()
Player p = new Player();
p.setLastName(lastNameTextField.getText());
p.setFirstName(firstNameTextField.getText());
int n = Integer.parseInt(numberTextField.getText());
p.setNumber(n);
return p;
public void setAddEditMode(boolean e)
lastNameTextField.setEditable(e);
lastNameTextField.setFocusable(e);
lastNameTextField.requestFocusInWindow();
firstNameTextField.setEditable(e);
firstNameTextField.setFocusable(e);
numberTextField.setEditable(e);
numberTextField.setFocusable(e);
class AutoSelect implements FocusListener
public void focusGained(FocusEvent e)
if(e.getComponent() instanceof JTextField)
JTextField t = (JTextField) e.getComponent();
t.selectAll();
public void focusLost(FocusEvent e){}
class IntFilter implements KeyListener
public void keyTyped(KeyEvent e)
char c = e.getKeyChar();
if ( c !='0' && c !='1' && c !='2' && c !='3' && c !='4' && c !='5'
&& c !='6' && c !='7' && c !='8' && c !='9')
e.consume();
public void keyPressed(KeyEvent e){}
public void keyReleased(KeyEvent e){}
class ButtonPanel extends JPanel
public JButton addButton,
editButton,
deleteButton,
acceptButton,
cancelButton,
exitButton;
public ButtonPanel()
// create maintenance button panel
JPanel maintPanel = new JPanel();
maintPanel.setLayout(new FlowLayout(FlowLayout.CENTER));
// add button
addButton = new JButton("Add");
addButton.addActionListener(new AddListener());
maintPanel.add(addButton);
// edit button
editButton = new JButton("Edit");
editButton.addActionListener(new EditListener());
maintPanel.add(editButton);
// delete button
deleteButton = new JButton("Delete");
deleteButton.addActionListener(new DeleteListener());
maintPanel.add(deleteButton);
// accept button
acceptButton = new JButton("Accept");
acceptButton.setEnabled(false);
acceptButton.addActionListener(new AcceptListener());
maintPanel.add(acceptButton);
// cancel button
cancelButton = new JButton("Cancel");
cancelButton.setEnabled(false);
cancelButton.addActionListener(new CancelListener());
maintPanel.add(cancelButton);
// create exit button panel
JPanel exitPanel = new JPanel();
exitPanel.setLayout(new FlowLayout(FlowLayout.RIGHT));
// exit button
exitButton = new JButton("Exit");
exitButton.addActionListener(new ExitListener());
exitPanel.add(exitButton);
// add panels to the ButtonPanel
setLayout(new BorderLayout());
add(maintPanel, BorderLayout.CENTER);
add(exitPanel, BorderLayout.SOUTH);
public void setAddEditMode(boolean e)
addButton.setEnabled(!e);
editButton.setEnabled(!e);
deleteButton.setEnabled(!e);
acceptButton.setEnabled(e);
cancelButton.setEnabled(e);
class AddListener implements ActionListener
public void actionPerformed(ActionEvent e)
newPlayer = new Player();
playerPanel.clearFields();
buttonPanel.setAddEditMode(true);
playerPanel.setAddEditMode(true);
class EditListener implements ActionListener
public void actionPerformed(ActionEvent e)
buttonPanel.setAddEditMode(true);
playerPanel.setAddEditMode(true);
class DeleteListener implements ActionListener
public void actionPerformed(ActionEvent e)
Player p = selectorPanel.getCurrentPlayer();
team.remove(p);
TeamIO.saveTeam();
selectorPanel.fillComboBox(team);
selectorPanel.selectPlayer(team.get(0));
playerPanel.showPlayer(team.get(0));
selectorPanel.playerComboBox.requestFocusInWindow();
class AcceptListener implements ActionListener
public void actionPerformed(ActionEvent e)
if (isValidData())
if (newPlayer != null)
newPlayer = playerPanel.getPlayer();
team.add(newPlayer);
TeamIO.saveTeam();
selectorPanel.fillComboBox(team);
selectorPanel.selectPlayer(newPlayer);
newPlayer = null;
else
Player p = selectorPanel.getCurrentPlayer();
Player newPlayer = playerPanel.getPlayer();
p.setLastName(newPlayer.getLastName());
p.setFirstName(newPlayer.getFirstName());
p.setNumber(newPlayer.getNumber());
TeamIO.saveTeam();
selectorPanel.fillComboBox(team);
selectorPanel.selectPlayer(p);
playerPanel.showPlayer(selectorPanel.getCurrentPlayer());
playerPanel.setAddEditMode(false);
buttonPanel.setAddEditMode(false);
selectorPanel.playerComboBox.requestFocusInWindow();
public boolean isValidData()
return SwingValidator.isPresent(playerPanel.lastNameTextField, "Last Name")
&& SwingValidator.isPresent(playerPanel.firstNameTextField, "First Name")
&& SwingValidator.isPresent(playerPanel.numberTextField, "Number")
&& SwingValidator.isInteger(playerPanel.numberTextField, "Number");
class CancelListener implements ActionListener
public void actionPerformed(ActionEvent e)
if (newPlayer != null)
newPlayer = null;
playerPanel.setAddEditMode(false);
playerPanel.showPlayer(selectorPanel.getCurrentPlayer());
buttonPanel.setAddEditMode(false);
selectorPanel.playerComboBox.requestFocusInWindow();
class ExitListener implements ActionListener
public void actionPerformed(ActionEvent e)
System.exit(0);
}Swing Validator Code:
//Programmed by Doe, John 20OCT2007
import javax.swing.*;
import javax.swing.text.JTextComponent;
public class SwingValidator
public static boolean isPresent(JTextComponent c, String title)
if(c.getText().length()==0)
showMessage(c, title + " is a required field.\n" + "Please re-enter.");
c.requestFocusInWindow();
return false;
return true;
public static boolean isInteger(JTextComponent c, String title)
try
int i = Integer.parseInt(c.getText());
return true;
catch(NumberFormatException e)
showMessage(c,title+" must be an integer.\n"+"Please re-enter.");
c.requestFocusInWindow();
return false;
private static void showMessage(JTextComponent c, String message)
JOptionPane.showMessageDialog(c, message, "Invalid Entry", JOptionPane.ERROR_MESSAGE);
}Edited by: kc0poc on Oct 21, 2007 8:17 AMOk. Got it, understand it now. Corrected all 58 errors after created the top level classes. It compiles, but I'm now encountering a NullPointerException:
Exception in thread "main" java.lang.NullPointerException
at teamSelectorPanel.fillComboBox(TeamRosterAppTest.java:233)
at teamSelectorPanel.<init>(TeamRosterAppTest.java:214)
at TeamRosterPanel.<init>(TeamRosterAppTest.java:164)
at TeamRosterFrame.<init>(TeamRosterAppTest.java:135)
at TeamRosterAppTest.main(TeamRosterAppTest.java:17)
I think I am not initializing something correctly and it involved the "team" variable. Thoughts anyone?
Thank you as always!
Below is my code:
//Modified by Campbell, Corey 20OCT2007
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.JTextComponent;
import java.util.ArrayList;
import java.text.*;
import java.lang.*;
import java.util.*;
public class TeamRosterAppTest
public static void main(String[] args)
TeamIO.getTeam();
JFrame frame = new TeamRosterFrame();
frame.setVisible(true);
class Player
String lname;
String fname;
int number;
public Player()
lname = "";
fname = "";
number = 0;
public Player(String lname, String fname, int number)
this.lname = lname;
this.fname = fname;
this.number = number;
public void setLastName(String lname)
this.lname = lname;
public String getLastName()
return lname;
public void setFirstName(String fname)
this.fname = fname;
public String getFirstName()
return fname;
public void setNumber(int number)
this.number = number;
public int getNumber()
return number;
class TeamIO
private static final ArrayList<Player> team = new ArrayList<Player>();
public static ArrayList<Player> getTeam()
team.add(new Player("Campbell", "Corey", 69));
team.add(new Player("Berg", "Laura", 44));
team.add(new Player("Bustos", "Crystl", 6));
team.add(new Player("Clark", "Jamie", 24));
team.add(new Player("Fernandez", "Lisa", 16));
team.add(new Player("Finch", "Jennie", 27));
team.add(new Player("Flowers", "Tairia", 11));
team.add(new Player("Freed", "Amanda", 7));
team.add(new Player("Giordano", "Nicole", 4));
team.add(new Player("Harrigan", "Lori", 21));
team.add(new Player("Jung", "Lovieanne", 3));
team.add(new Player("Kretchman", "Kelly", 12));
team.add(new Player("Lappin", "Lauren", 37));
team.add(new Player("Mendoza", "Jessica", 2));
team.add(new Player("O'Brien-Amico", "Lisa", 20));
team.add(new Player("Nuveman", "Stacy", 33));
team.add(new Player("Osterman", "Catherine", 8));
team.add(new Player("Topping", "Jennie", 31));
team.add(new Player("Watley", "Natasha", 29));
//System.out.println("\nOpening team list" + "\n\n" + "****************************************");
//for(int i = 0; i < team.size(); i++)
// Player p = (Player)team.get(i);
// System.out.print(p.getNumber() + "\t" + p.getLastName() + "," + p.getFirstName() + "\n");
//System.out.println("****************************************");
return new ArrayList<Player>(team);
public static ArrayList<Player> saveTeam()
System.out.println("\nOpening team list" + "\n\n" + "****************************************");
for(int i = 0; i < team.size(); i++)
Player p = (Player)team.get(i);
System.out.print(p.getNumber() + "\t" + p.getLastName() + "," + p.getFirstName() + "\n");
System.out.println("****************************************");
return new ArrayList<Player>(team);
class TeamRosterFrame extends JFrame
public TeamRosterFrame()
String me = "Campbell, Corey";
String date;
Date now = new Date();
DateFormat longDate = DateFormat.getDateInstance(DateFormat.LONG);
date = longDate.format(now);
setTitle("Team Roster "+me+" "+date);
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.add(new TeamRosterPanel());
this.pack();
centerWindow(this);
private void centerWindow(Window w)
Toolkit tk = Toolkit.getDefaultToolkit();
Dimension d = tk.getScreenSize();
setLocation((d.width-w.getWidth())/2, (d.height-w.getHeight())/2);
class TeamRosterPanel extends JPanel
ArrayList<Player>team;
Player newPlayer = null;
teamSelectorPanel selectorPanel;
PlayerDisplayPanel playerPanel;
ButtonPanel buttonPanel;
public TeamRosterPanel()
// fill the team ArrayList
team = TeamIO.getTeam();
// add the panels
setLayout(new GridBagLayout());
selectorPanel = new teamSelectorPanel();
add(selectorPanel, getConstraints(0,0,1,1, GridBagConstraints.WEST));
playerPanel = new PlayerDisplayPanel();
add(playerPanel, getConstraints(0,1,1,1, GridBagConstraints.EAST));
buttonPanel = new ButtonPanel();
add(buttonPanel, getConstraints(0,2,1,1, GridBagConstraints.EAST));
// set the initial player to be displayed
playerPanel.showPlayer(team.get(0));
selectorPanel.selectPlayer(team.get(0));
// a method for setting grid bag constraints
private GridBagConstraints getConstraints(int gridx, int gridy,
int gridwidth, int gridheight, int anchor)
GridBagConstraints c = new GridBagConstraints();
c.insets = new Insets(5, 5, 5, 5);
c.ipadx = 0;
c.ipady = 0;
c.gridx = gridx;
c.gridy = gridy;
c.gridwidth = gridwidth;
c.gridheight = gridheight;
c.anchor = anchor;
return c;
class teamSelectorPanel extends JPanel implements ActionListener
public JComboBox playerComboBox;
private JLabel playerLabel;
boolean filling = false; // used to indicate the combo box is being filled
ArrayList<Player>team;
PlayerDisplayPanel playerPanel;
public teamSelectorPanel()
// set panel layout
setLayout(new FlowLayout(FlowLayout.LEFT));
// Player label
playerLabel = new JLabel("Select Player:");
add(playerLabel);
// Player combo box
playerComboBox = new JComboBox();
fillComboBox(team);
playerComboBox.addActionListener(this);
add(playerComboBox);
public void actionPerformed(ActionEvent e)
if (!filling)
Player p = (Player)playerComboBox.getSelectedItem();
playerPanel.showPlayer(p);
public void fillComboBox(ArrayList<Player> team)
filling = true;
playerComboBox.removeAllItems();
for (Player p : team)
playerComboBox.addItem(p);
filling = false;
public void selectPlayer(Player p)
playerComboBox.setSelectedItem(p);
public Player getCurrentPlayer()
return (Player) playerComboBox.getSelectedItem();
class PlayerDisplayPanel extends JPanel
public JTextField lastNameTextField,
firstNameTextField,
numberTextField;
private JLabel lastNameLabel,
firstNameLabel,
numberLabel;
public PlayerDisplayPanel()
// set panel layout
setLayout(new GridBagLayout());
// last name label
lastNameLabel = new JLabel("Last name:");
add(lastNameLabel, getConstraints(0,0,1,1, GridBagConstraints.EAST));
// last name text field
lastNameTextField = new JTextField(10);
lastNameTextField.setEditable(false);
lastNameTextField.setFocusable(false);
lastNameTextField.addFocusListener(new AutoSelect());
add(lastNameTextField, getConstraints(1,0,1,1, GridBagConstraints.WEST));
// first name label
firstNameLabel = new JLabel("First name:");
add(firstNameLabel, getConstraints(0,1,1,1, GridBagConstraints.EAST));
// first name text field
firstNameTextField = new JTextField(30);
firstNameTextField.setEditable(false);
firstNameTextField.setFocusable(false);
firstNameTextField.addFocusListener(new AutoSelect());
add(firstNameTextField, getConstraints(1,1,1,1, GridBagConstraints.WEST));
// number label
numberLabel = new JLabel("Number:");
add(numberLabel, getConstraints(0,2,1,1, GridBagConstraints.EAST));
// number text field
numberTextField = new JTextField(10);
numberTextField.setEditable(false);
numberTextField.setFocusable(false);
numberTextField.addFocusListener(new AutoSelect());
numberTextField.addKeyListener(new IntFilter());
add(numberTextField, getConstraints(1,2,1,1, GridBagConstraints.WEST));
public void showPlayer(Player p)
lastNameTextField.setText(p.getLastName());
firstNameTextField.setText(p.getFirstName());
numberTextField.setText(String.valueOf(p.getNumber()));
public void clearFields()
lastNameTextField.setText("");
firstNameTextField.setText("");
numberTextField.setText("");
// return a new Player object with the data in the text fields
public Player getPlayer()
Player p = new Player();
p.setLastName(lastNameTextField.getText());
p.setFirstName(firstNameTextField.getText());
int n = Integer.parseInt(numberTextField.getText());
p.setNumber(n);
return p;
public void setAddEditMode(boolean e)
lastNameTextField.setEditable(e);
lastNameTextField.setFocusable(e);
lastNameTextField.requestFocusInWindow();
firstNameTextField.setEditable(e);
firstNameTextField.setFocusable(e);
numberTextField.setEditable(e);
numberTextField.setFocusable(e);
// a method for setting grid bag constraints
private GridBagConstraints getConstraints(int gridx, int gridy,
int gridwidth, int gridheight, int anchor)
GridBagConstraints c = new GridBagConstraints();
c.insets = new Insets(5, 5, 5, 5);
c.ipadx = 0;
c.ipady = 0;
c.gridx = gridx;
c.gridy = gridy;
c.gridwidth = gridwidth;
c.gridheight = gridheight;
c.anchor = anchor;
return c;
class AutoSelect implements FocusListener
public void focusGained(FocusEvent e)
if(e.getComponent() instanceof JTextField)
JTextField t = (JTextField) e.getComponent();
t.selectAll();
public void focusLost(FocusEvent e){}
class IntFilter implements KeyListener
public void keyTyped(KeyEvent e)
char c = e.getKeyChar();
if ( c !='0' && c !='1' && c !='2' && c !='3' && c !='4' && c !='5'
&& c !='6' && c !='7' && c !='8' && c !='9')
e.consume();
public void keyPressed(KeyEvent e){}
public void keyReleased(KeyEvent e){}
class ButtonPanel extends JPanel
public JButton addButton,
editButton,
deleteButton,
acceptButton,
cancelButton,
exitButton;
public ButtonPanel()
// create maintenance button panel
JPanel maintPanel = new JPanel();
maintPanel.setLayout(new FlowLayout(FlowLayout.CENTER));
// add button
addButton = new JButton("Add");
addButton.addActionListener(new AddListener());
maintPanel.add(addButton);
// edit button
editButton = new JButton("Edit");
editButton.addActionListener(new EditListener());
maintPanel.add(editButton);
// delete button
deleteButton = new JButton("Delete");
deleteButton.addActionListener(new DeleteListener());
maintPanel.add(deleteButton);
// accept button
acceptButton = new JButton("Accept");
acceptButton.setEnabled(false);
acceptButton.addActionListener(new AcceptListener());
maintPanel.add(acceptButton);
// cancel button
cancelButton = new JButton("Cancel");
cancelButton.setEnabled(false);
cancelButton.addActionListener(new CancelListener());
maintPanel.add(cancelButton);
// create exit button panel
JPanel exitPanel = new JPanel();
exitPanel.setLayout(new FlowLayout(FlowLayout.RIGHT));
// exit button
exitButton = new JButton("Exit");
exitButton.addActionListener(new ExitListener());
exitPanel.add(exitButton);
// add panels to the ButtonPanel
setLayout(new BorderLayout());
add(maintPanel, BorderLayout.CENTER);
add(exitPanel, BorderLayout.SOUTH);
public void setAddEditMode(boolean e)
addButton.setEnabled(!e);
editButton.setEnabled(!e);
deleteButton.setEnabled(!e);
acceptButton.setEnabled(e);
cancelButton.setEnabled(e);
class AddListener implements ActionListener
PlayerDisplayPanel playerPanel;
ButtonPanel buttonPanel;
Player newPlayer;
public void actionPerformed(ActionEvent e)
newPlayer = new Player();
playerPanel.clearFields();
buttonPanel.setAddEditMode(true);
playerPanel.setAddEditMode(true);
class EditListener implements ActionListener
ButtonPanel buttonPanel;
PlayerDisplayPanel playerPanel;
public void actionPerformed(ActionEvent e)
buttonPanel.setAddEditMode(true);
playerPanel.setAddEditMode(true);
class DeleteListener implements ActionListener
teamSelectorPanel selectorPanel;
PlayerDisplayPanel playerPanel;
ArrayList<Player>team;
public void actionPerformed(ActionEvent e)
Player p = selectorPanel.getCurrentPlayer();
team.remove(p);
TeamIO.saveTeam();
selectorPanel.fillComboBox(team);
selectorPanel.selectPlayer(team.get(0));
playerPanel.showPlayer(team.get(0));
selectorPanel.playerComboBox.requestFocusInWindow();
class AcceptListener implements ActionListener
teamSelectorPanel selectorPanel;
PlayerDisplayPanel playerPanel;
ButtonPanel buttonPanel;
ArrayList<Player>team;
Player newPlayer;
public void actionPerformed(ActionEvent e)
if (isValidData())
if (newPlayer != null)
newPlayer = playerPanel.getPlayer();
team.add(newPlayer);
TeamIO.saveTeam();
selectorPanel.fillComboBox(team);
selectorPanel.selectPlayer(newPlayer);
newPlayer = null;
else
Player p = selectorPanel.getCurrentPlayer();
Player newPlayer = playerPanel.getPlayer();
p.setLastName(newPlayer.getLastName());
p.setFirstName(newPlayer.getFirstName());
p.setNumber(newPlayer.getNumber());
TeamIO.saveTeam();
selectorPanel.fillComboBox(team);
selectorPanel.selectPlayer(p);
playerPanel.showPlayer(selectorPanel.getCurrentPlayer());
playerPanel.setAddEditMode(false);
buttonPanel.setAddEditMode(false);
selectorPanel.playerComboBox.requestFocusInWindow();
public boolean isValidData()
return SwingValidator.isPresent(playerPanel.lastNameTextField, "Last Name")
&& SwingValidator.isPresent(playerPanel.firstNameTextField, "First Name")
&& SwingValidator.isPresent(playerPanel.numberTextField, "Number")
&& SwingValidator.isInteger(playerPanel.numberTextField, "Number");
class CancelListener implements ActionListener
Player newPlayer;
PlayerDisplayPanel playerPanel;
ButtonPanel buttonPanel;
teamSelectorPanel selectorPanel;
public void actionPerformed(ActionEvent e)
if (newPlayer != null)
newPlayer = null;
playerPanel.setAddEditMode(false);
playerPanel.showPlayer(selectorPanel.getCurrentPlayer());
buttonPanel.setAddEditMode(false);
selectorPanel.playerComboBox.requestFocusInWindow();
class ExitListener implements ActionListener
public void actionPerformed(ActionEvent e)
System.exit(0);
class SwingValidator
public static boolean isPresent(JTextComponent c, String title)
if(c.getText().length()==0)
showMessage(c, title + " is a required field.\n" + "Please re-enter.");
c.requestFocusInWindow();
return false;
return true;
public static boolean isInteger(JTextComponent c, String title)
try
int i = Integer.parseInt(c.getText());
return true;
catch(NumberFormatException e)
showMessage(c,title+" must be an integer.\n"+"Please re-enter.");
c.requestFocusInWindow();
return false;
private static void showMessage(JTextComponent c, String message)
JOptionPane.showMessageDialog(c, message, "Invalid Entry", JOptionPane.ERROR_MESSAGE);
} -
How do I convert an int to a String?
How do I convert an int to a String?
You can also use any of these methods if you need to get more complicated:
Integer.toString(int i)
Integer.toBinaryString(int i)
Integer.toHexString(int i)
Integer.toOctalString(int i)
Integer.toString(int i, int radix) -
Convert an IP address into an integer
Hi Everyone,
One of methods in my COM object is
public void setIP(Variant ip)
with Variant data type supposes to be 4 byte int. I don't know how to convert a string like "192.167.1.108" to an int so I can pass in the above function. Would anybody please help me out!
Someone helped me out with his sample, but for some reason, the sample did not work for all ip address. e.g 192.167.1.108, 192.167.2.1 etc.
Here is someone's sample:
static int ipToInt(String ip)
StringTokenizer st = new StringTokenizer(ip, ".");
int numParts = st.countTokens();
if (numParts == 0)
throw new IllegalArgumentException("Invalid IP address: empty argument");
if (numParts > 4)
throw new IllegalArgumentException("Invalid IP address: too many tokens");
int ipInt = 0;
for (int i = 1; i < numParts; i++)
String token = st.nextToken();
int tokenVal = Integer.parseInt(token);
// Above will throw NumberFormatException if the token is not an integer
int processedVal = tokenVal << (8 * (4 - i));
// Moves the byte to the correct portion of the int
ipInt = ipInt + processedVal;
String token = st.nextToken();
int tokenVal = Integer.parseInt(token);
// Above will throw NumberFormatException if the token is not an integer
ipInt = ipInt + tokenVal;
Thanks in advance
Hungstatic long ipToInt(String ip)
StringTokenizer st = new StringTokenizer(ip, ".");
long numParts = st.countTokens();
if (numParts == 0)
throw new IllegalArgumentException("Invalid IP address: empty argument");
if (numParts > 4)
throw new IllegalArgumentException("Invalid IP address: too many tokens");
long ipInt = 0;
while (st.hasMoreTokens()) {
long tokenVal = Integer.parseInt(st.nextToken());
ipInt = (ipInt << 8) + tokenVal;
// System.out.println(Long.toHexString(ipInt));
return ipInt;
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