Objects by value/reference

[vuthlarhi donald]

public class Test7{
public Test7(){}
public Test7(Test7 ref){
this (ref,"Hai");
}
public Test7(Test7 ref,String str){
ref.Test7(str);
System.out.println("Hi");
}
public void Test7(String str){
System.out.println(str);
}
public static void main(String[] args){
Test7 t = new Test7();
Test7 t7 = new Test7(t);
}
}

can anyone explain to me the output of this programme in more details...I am having a problem when it comes to passing by value and pass by reference...

[Sandip Sarkar]

Your program is as follows:

public class Test7{
public Test7(){}//1
public Test7(Test7 ref){//2
this (ref,"Hai");//3
}
public Test7(Test7 ref,String str){ //4
ref.Test7(str);//5
System.out.println("Hi");//6
}
public void Test7(String str){//7
System.out.println(str);//8
}
public static void main(String[] args){
Test7 t = new Test7();//9
Test7 t7 = new Test7(t); //10
}
}

Now Line 10 calls for Line 2.
Line 3 passes it on to Line 4 .
Line 5 calls function at Line 7.
Line 8 prints "Hai".
Line 6 prints "Hi".

So the output is :
"Hai"
"Hi"

I hope it helped.

[Nicholas Jordan]

[vuthlarhi donald:]   I am having a problem when it comes to passing by value and pass by reference...

What problem, your code does not demonstrate the passing by value v pass by reference design challenge efficiently:

package demo;
/* 
 * Demonstrate pass by value and pass by reference.
 */
 
 public class Passer 
 {
     StringBuffer s = new StringBuffer("The sands of time.");// complex data.
     char c = ' ';// primitive data 
     void change(char c)// changes nothing
     {
         c++;
     }
     void change(StringBuffer t)// changes the buffer
     {
         t.insert(0,"Time for Sandy to read the posting guidelines for displayed names");
     }
 }

[Jesper de Jong]

Originally posted by vuthlarhi donald:
can anyone explain to me the output of this programme in more details...I am having a problem when it comes to passing by value and pass by reference...

In Java, everything is always passed by value. There is no pass by reference in Java.

See the JavaRanch Campfire Story: Pass-by-Value Please