Swaping Objects in an Array of Objects

Hello everyone. I have an Interface Measurable and an Array of Measurable objects. I want to grab 2 random objects from the array and then I compair them. If the compair comes out a certain way I swap the objects and then repaint them on an applet. The problem is when I System.out.println() the array changes I see the swap, but the objects do not swap on the applet when I repaint. I think I its because I'm changing references and not the actual objects, but I can't quite get my head around what I'm doing wrong. Here is the snippet of code from my sort method.
     public void sort()
     //Grab two random int positions from chessPieces[]
          Measurable firstP;
          Measurable secondP;
          int rPos1 = rndn.getRandom(chessPieces.length - 1);
          int rPos2 = rndn.getRandom(chessPieces.length - 1);
          if((chessPieces[rPos1].compareTo(chessPieces[rPos1]) == -1) || (chessPieces[rPos1].compareTo(chessPieces[rPos2]) == 1))
               System.out.println("BEFORE chessPieces[rPos1] = " + chessPieces[rPos1] + " BEFORE chessPieces[rPos2] = " + chessPieces[rPos2]);
               firstP = chessPieces[rPos1];
               secondP = chessPieces[rPos2];
               chessPieces[rPos1] = secondP;
               chessPieces[rPos2] = firstP;
               System.out.println("AFTER chessPieces[rPos1] = " + chessPieces[rPos1] + " AFTER chessPieces[rPos2] = " + chessPieces[rPos2]);
     }

Here is the painter code. I'm still stuck. I don't know why it doesn't swap.
public class A1 extends Applet {
//Instance Variables
boolean make = true;
public static Measurable[] chessPieces = new Measurable[50];
MyRandom rndn = new MyRandom();
     //Constructor
     public A1()
          int delay = 250; //milliseconds
          ActionListener taskPerformer = new ActionListener() {
          public void actionPerformed(ActionEvent evt) {
          repaint();
new Timer(delay, taskPerformer).start();
     public void paint(Graphics g) {
          Graphics2D g2 = (Graphics2D) g; //Casting
          setBackground(Color.white);
          while(make == true)
               for(int i = 0; i < chessPieces.length; i++)//Randomly make chess objects
                    int digit = rndn.getRandom(3);
                    if(digit == 0)
                         chessPieces[i] = new King(rndn.getRandom(450), rndn.getRandom(360));
                    else if(digit == 1)
                         chessPieces[i] = new Knight(rndn.getRandom(450), rndn.getRandom(360));
                    else if(digit == 2)
                         chessPieces[i] = new Queen(rndn.getRandom(450), rndn.getRandom(360));
                    else
                         chessPieces[i] = null;
          make = false;
          for(int j = 0; j < chessPieces.length -1; j++)
               chessPieces[j].getLocation();
               chessPieces[j].getMeasure();
               chessPieces[j].draw(g2);
          sort();
     }     // paint

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yes, I have redacted things, and obscured other things because I can not go around posting critical infrastructure information out on the internet.
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Displaying the contents of an array of objects

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robrom78 wrote:
public class TestObjects
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How can i convert object to byte array very*100 fast?

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Edited by: JongpilKim on May 17, 2009 10:48 PM
Edited by: JongpilKim on May 17, 2009 10:51 PM
Edited by: JongpilKim on May 17, 2009 10:53 PM

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How to pass a array of object to oracle procedure using callable

Hi,
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TYPE APPS.DEPARTMENT_TYPE AS OBJECT (
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JAVA CODE
Value Object
package com.custom.vo;
public class Dep {
public int empNo;
public String depName;
public String location;
public int getEmpNo() {
return empNo;
public void setEmpNo(int empNo) {
this.empNo = empNo;
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return depName;
public void setDepName(String depName) {
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to call stored procedure
package com.custom.callable;
import com.custom.vo.Dep;
import oracle.jdbc.OracleCallableStatement;
import oracle.jdbc.OracleConnection;
import oracle.jdbc.OracleTypes;
import oracle.jdbc.pool.OracleDataSource;
import oracle.sql.ARRAY;
import oracle.sql.ArrayDescriptor;
import oracle.sql.Datum;
import oracle.sql.STRUCT;
import oracle.sql.StructDescriptor;
public class CallableArrayTryOut {
private static OracleDataSource odcDataSource = null;
public static void main(String[] args) {
OracleCallableStatement callStatement = null;
OracleConnection connection = null;
try {
odcDataSource = new OracleDataSource();
odcDataSource
.setURL("......");
odcDataSource.setUser("....");
odcDataSource.setPassword("....");
connection = (OracleConnection) odcDataSource.getConnection();
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System.out.println("DB connection Exception");
e.printStackTrace();
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dep[0] = new Dep();
dep[0].setEmpNo(100);
dep[0].setDepName("aaa");
dep[0].setLocation("xxx");
dep[1] = new Dep();
dep[1].setEmpNo(200);
dep[1].setDepName("bbb");
dep[1].setLocation("yyy");
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at oracle.sql.StructDescriptor.toOracleArray(StructDescriptor.java:823)
at oracle.sql.StructDescriptor.toArray(StructDescriptor.java:1735)
at oracle.sql.STRUCT.<init>(STRUCT.java:136)
at com.custom.callable.CallableArrayTryOut.main(CallableArrayTryOut.java:48)

You posted this question in the wrong forum section. There is one dedicated to Java that was more appropriate.
Anyway here is a link that describes what you should do.
http://download.oracle.com/docs/cd/B19306_01/java.102/b14355/oraarr.htm#i1049179
Bye Alessandro

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0 : <CFString 0x7fff7df92580 [0x7fff7dfc7cf0]>{contents = "NSDebugDescription"} = <CFString 0x7fa64f44f0a0 [0x7fff7dfc7cf0]>{contents = "Unexpected character b at line 1"}
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                              if (nicesnowflakearray[0].y >= 460){
                                        if (nicesnowflakearray[0].y == stage.stageHeight) {
                                        nicesnowflakearray.splice(nicesnowflakearray.indexOf(nicesnowflake), 1);
                              //if (this.hitTestObject(nicesnowflake)){
                                        //trace("hit");
I am also fiddling with the collision, but I believe that it would sort itself out when I deal with the array pop and depop properly. However I'm pasting it anyway in case the issue is subtly hidden somewhere I'm not looking for it. And here is the child class:
public class Head extends Main {
                    public function Head(){
                              if (false){
                                        super();
                              this.stop();
So like what happens at the moment is that the array gets populated by the first object that spawns, but there is two objects on the stage, then when the objects reach stage.460y mark the array splices() the one object away and displays an error:
"#1010: A term is undefined and has no properties.
          at Main/snowhit()"
then when the next object spawns, it repeats the process. Why does it trace the array.length as "1, 1, 2, 2, 3, 3, 4, 4, 5, 5, etc" until the despawn point and then goes on to display an error and then starts from 1 again, because if the array length is more than one object at the time when the first object of the array gets spliced away, shouldn't it go on as usual, since there are other objects in the array?
Thank you very much to whomever will read this through.

There are multiple problems:
1. You should add eventlisteners for your objects only once, but you add eventlisteners every time your timer runs to all of your snowflakes, again and again:
                              for (var i:Number = 0; i < nicesnowflakearray.length; i++){
                                        nicesnowflakearray[i].addEventListener(Event.ENTER_FRAME, snowhit);
change it to
nicesnowflake.addEventListener(Event.ENTER_FRAME, snowhit);
I don`t see why its even necessary to employ this snowflakearray, it would be much straight forward if you simply let the snowflakes take care of themselves.
2. Then you have to change your enterframe function accordingly
public function snowhit(event:Event) : void {
                              if (e.currentTarget.y >= 460){
                                        if (e.currentTarget.y == stage.stageHeight) {
                                        e.currentTarget.removeEventlistener(Event.ENTER_FRAME, snowhit);
                                        removeChild(e.currentTarget);
3.
                              //if (this.hitTestObject(nicesnowflake)){
                                        //trace("hit");
since "this" is a reference to the Main class (root) it surely won`t function as you intend it to.
                              if (false){
                                        super();
makes no sense to use a condition that can never be true

Objects in an Array

I'm having trouble getting my objects into an array. The program compilies just fine, but when you run it, it just outputs all null values.
//import necessary classes
import java.util.Scanner;
import java.io.File;
import java.io.IOException;
import java.io.BufferedWriter;
import java.io.FileWriter;
import javax.swing.JOptionPane;
public class DanMPA6
public DanMPA6() throws IOException
// get the name of the input file from the username
String inFile = JOptionPane.showInputDialog( "Enter the name of the file:" ) ;
File inputFile = new File(inFile);
Scanner scan = new Scanner(inputFile);
scan.useDelimiter("[|\n\r]+");
// Passenger myPassObj;
Passenger[] ayPass = new Passenger [1500];
int count = 0;
//start the loop
while (scan.hasNext())
              // read all of the information from the data file in order
               int fakeID = Integer.parseInt(scan.next());
             String fakeClass = scan.next();
               int fakeSurvive = Integer.parseInt(scan.next());
             String fakeName = scan.next();
           double fakeAge = Double.parseDouble(scan.next());
           String fakeFrom = scan.next();
               String fakeTo = scan.next();
               String fakeRoom = scan.next();
             String fakeTicket = scan.next();
             String fakeLifeboat = scan.next();
             String fakeSex = scan.next();
             Passenger myPassObj = new Passenger (fakeID, fakeClass, fakeSurvive, fakeName, fakeAge, fakeFrom, fakeTo, fakeRoom, fakeTicket, fakeLifeboat, fakeSex);
               ayPass[count] = myPassObj;
               count++;
       /* String outFile = JOptionPane.showInputDialog (null, "Give the name of the output file:");
           FileWriter fw = new FileWriter (outFile, false);
           BufferedWriter bw = new BufferedWriter(fw);
           bw.write(ayPass[count] + "\n"); */
public static void main (String [] args) throws IOException
     new DanMPA6();
class Passenger
// data members
       int passID;
       String passClass;
       int passSurvive;
       String passName;
       double passAge;
       String passFrom;
       String passTo;
       String passRoom;
       String passTicket;
       String passLifeboat;
       String passSex;
       public Passenger (int fakeID, String fakeClass, int fakeSurvive, String fakeName, double fakeAge, String fakeFrom, String fakeTo, String fakeRoom, String fakeTicket, String fakeLifeboat, String fakeSex)
       passID = fakeID;
       passClass = fakeClass;
       passSurvive = fakeSurvive;
       passName = fakeName;
       passAge = fakeAge;
       passFrom = fakeFrom;
       passTo = fakeTo;
       passRoom = fakeRoom;
       passTicket = fakeTicket;
       passLifeboat = fakeLifeboat;
       passSex = fakeSex;


Thank you very much! That worked. So now I have all my objects in the array, but it seems that I'm running into a different problem when I attempt to output the results into a different .txt file. It creates the file, but with nothing in it! I even tried just a basic line of text and that didn't work either.
This is the code that I was attempting to do that with:
FileWriter fw = new FileWriter (outFile, false);
BufferedWriter bw = new BufferedWriter(fw);
bw.write(ayPass[count] + "\n");

Converting object wrapper type array into equivalent primary type array

Hi All!
My question is how to convert object wrapper type array into equivalent prime type array, e.g. Integer[] -> int[] or Float[] -> float[] etc.
Is sound like a trivial task however the problem is that I do not know the type I work with. To understand what I mean, please read the following code -
//Method signature
Object createArray( Class clazz, String value ) throws Exception;
//and usage should be as follows:
Object arr = createArray( Integer.class, "2%%3%%4" );
//"arr" will be passed as a parameter of a method again via reflection
public void compute( Object... args ) {
    a = (int[])args[0];
//or
Object arr = createArray( Double.class, "2%%3%%4" );
public void compute( Object... args ) {
    b = (double[])args[0];
//and the method implementation -
Object createArray( Class clazz, String value ) throws Exception {
     String[] split = value.split( "%%" );
     //create array, e.g. Integer[] or Double[] etc.
     Object[] o = (Object[])Array.newInstance( clazz, split.length );
     //fill the array with parsed values, on parse error exception will be thrown
     for (int i = 0; i < split.length; i++) {
          Method meth = clazz.getMethod( "valueOf", new Class[]{ String.class });
          o[i] = meth.invoke( null, new Object[]{ split[i] });
     //here convert Object[] to Object of type int[] or double[] etc...
     /* and return that object*/
     //NB!!! I want to avoid the following code:
     if( o instanceof Integer[] ) {
          int[] ar = new int[o.length];
          for (int i = 0; i < o.length; i++) {
               ar[i] = (Integer)o;
          return ar;
     } else if( o instanceof Double[] ) {
     //...repeat "else if" for all primary types... :(
     return null;
Unfortunately I was unable to find any useful method in Java API (I work with 1.5).
Did I make myself clear? :)
Thanks in advance,
Pavel Grigorenko

I think I've found the answer myself ;-)
Never thought I could use something like int.class or double.class,
so the next statement holds int[] q = (int[])Array.newInstance( int.class, 2 );
and the easy solution is the following -
Object primeArray = Array.newInstance( token.getPrimeClass(), split.length );
for (int j = 0; j < split.length; j++) {
     Method meth = clazz.getMethod( "valueOf", new Class[]{ String.class });
     Object val = meth.invoke( null, new Object[]{ split[j] });
     Array.set( primeArray, j, val );
}where "token.getPrimeClass()" return appropriate Class, i.e. int.class, float.class etc.

How to pass array of Object in A Procedure using OCCI.......

I m also trying for How to pass Object to a procedureb using OCCI...
Steps....
1. I created A type.....
2. Then I created a VARRAY using that Type.
3.After that I have written An Procedure with object as a parameter..
now using OCCI how do u bind the parameter with this . plz note that using OTT
i have already created the class representation of above object type i.e class
four Files Created 1> demo.h 2>registermapping.h
3> demo.cpp 2>registermapping.cpp
After I want to Pass the Values in A Vector...
vctor<full_name *> vect;
stmt=con->createStatement("BEGIN Add_Object(:1); END;");
full_name *name1 = new full_name; //Giving the Error here Given below....
name1->
name1->
Through name1 Which Function I will call in which I will Pass a String....
like
name1->readSQL("Sanjay"); Or I have to add a function......
vect.push_back(name1);
setVector(stmt,1,vect,"FULL_NAME");
error C2259: 'FullName' : cannot instantiate abstract class
can u plz suggest me Why this Error is Giving......?
How to pass the data?
setFirst_name() and setLast_name() this two function I will add in Demo.cpp which one created automativcally by Using OTT command.....or other way plz tell me Boss ....
Can u lz Suggest me ASAP....

hi Nishant ,
What u have done Now I mm trying ....
can u Plz Suggest me......
How to pass and Array of Object in Procedure using OCCI... Doing....
90% finished Two Error's Are Coming...
1> If I create the Class then Data Not Inserting table......
2> If I will create the Class through OTT command.......
then U can't Instantiate Object It is DIsplying ,this is Abstract Class(PObject)...
Beco'z the below Method is Not adding Automatically by OTT command which is Pure Virtual Function.....
But I added this Function Still SAme Error Giving..
getSQLTypeName(oracle::occi::Environment env, void *schName,
unsigned int &schNameLen, void **typeName,
unsigned int &typeNameLen) const
Plz Suggest me....
regard's
sanjay

Array of Object

How to create array of object dynamically and the class is also having constructor.
like:
class Cir{
private double radius;
Cir(double r){
redius=r;
10 objects are to be created within for loop

Cir c[]=new Cir[10]
for(int i=0;i<10;i++)
c [ i ] =new Cir(radious);
Message was edited by:
ramireddi

Array of objects.....different syntax !!

Both are Array of objects.........
Object[] array = new Object[2];
        array[0] = new Long( 1 );
        array[1] = new String( "My string" );Another code.........
private Color colors[] =
         { Color.black, Color.blue, Color.cyan, Color.darkGray,
         Color.gray, Color.green, Color.lightGray,
         Color.magenta, Color.orange, Color.pink, Color.red,
     Color.white, Color.yellow };Both are array of objects. but look the difference one usues new another dont
i dont like the second one.....but it is usued. what is it ?

What I meant is you can always use the new operator to create an array. You can even use it in conjunction with populating it: Object[] = new Object[] {"foo", new Integer(5), etc...}; But more to the point, declaring an array final says nothing about that array's elements.
public class ZZZ {
    final int[] arr_; // legal, as long as all ctors give this variable a value
    public ZZZ() {
        arr_ = new int[1]; // legal, even without providing a value for the element
    public ZZZ(int size) {
        arr_ = new int[size]; // legal
        arr_[0] = 0; // legal
        arr_[0] = 1; // legal
}

Swaping Objects in an Array of Objects

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