Thread: array element declaring problem

<code>public class mHandler
{


public static int num=4;


...............
...........
.........
......
public static void main(String[] args)
{


some code}



}


public class A

{
int num;
B aList[]=new B[num];



}





public class B
{

int x;
int y;

public B(int a,int b)
{
this.x=a;
this.y=b;


}

}







</code>


although i have defined num as global variable, i can not define the arrays using num in the array element brackets like [num] in the class A.. Specifically aList[num] is not defined

but how can i define num once

To define the variable num only once, remove the "int num" line:

public class A
 
{
int num; // Remove this line it is a second definition of num

Please edit your code and wrap it in code tags. Unformatted code is hard to read. See: http://www.javaprogrammingforums.com...do=bbcode#code

If you get compile errors, please copy and paste here the full text.

 
 
public class mHand {
 
	/**
	 * @param args
	 */public static int num =3;
	public static void main(String[] args) {
 
	b m=new b();
	c g=new c();
	m.aList[0]=g;
 
	System.out.println(m.aList[0].x);
 
 
		// TODO Auto-generated method stub
 
	}
 
}
 
 
public class b {
int x,y;
 
	c aList[]=new c[num];
 
 
 
}                    
 
 
public class c {
 
 
	int x=2;;
	int y=3;
 
}

error come on line :
c aList[]=new c[num];

num cannot be resolved to a variable

You have declared num in class mHand. Class B does not know anything about it. Think about different rooms in a building. I'm standing in one room with a number written on a piece of paper. You are in a different room at the other end of the building. Can you see what is written on my piece of paper?

If you have declared it static (which is a bad idea in my opinion) you would access it classname.variablename.

If you make it non-static then class b would need to instantiate an object of mHand and then access it directly or via a method.

Try creating the array after you assign a value to num.