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Thread: call by value and call by reference

  1. #1
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    Default call by value and call by reference

    //Code=java//

    Here is the code of call by value and call by reference
    class test 
    {
    	void meth (int a,int b)
    	{
    		a*=2;
    		b/=2;
    	}
    }
    class callbyvalue 
    {
    	public static void main(String[] args)
    	{
    		test ob=new test();
    		int i=15,j=20;
    		System.out.println("i and j before call :" +i + " " +j);
    		ob.meth(i,j);
    		System.out.println("i and j after call : " + i + " " +j);
    	}
    }
     
    class test1 
    {
    int a,b;
    test1 (int i, int j)
    {
    	a=i;
    	b=j;
    }
    void meth(test1 o)
    {
    o.a*=2;
    o.b/=2;
    }
    }
    	class callbyref
    	{
    		public static void main (String args[])
    		{
    			test1 ob=new test1 (15,20);
    			System.out.println("ob.a and ob.b before call: " +ob.a +" " + ob.b);
    			ob.meth(ob);
    			System.out.println("ob.a and ob.b after call : "+ob.a +" "+ob.b);
    		}
    When i compile test.java file , It compiles and gives me a run time error main method not found in test ,please define the main method as public static void main(String args[])

    On the other hand , when i am compiling test1.java, it is also giving the same error.My question is main method is there in both the codes . So what do we mean by this error?

    Why is it so? Please help me resolve both as i have exam . Thanks

    //Code=Java
    Last edited by helloworld922; September 2nd, 2012 at 10:36 AM.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: call by value and call by reference

    when i am compiling test 1.java, it is giving a run time error of could not load main class test 1.
    Not sure your question makes sense. It is not possible to have a space in a class name: test 1

    What don't you understand about the following error message:
    main method not found in test ,please define the main method as public static void main(String args[])
    What the java program is telling you seems very clear.

    Please Edit your post and wrap your code with
    [code=java]
    <YOUR CODE HERE>
    [/code]
    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.

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