在Java中将数组作为参数传递

Question

i wants to pass array as arguments to sub class from main . but looks like its not initialized.Please have a look on below and advice where i am wrong. Thanks in Advance

    class arraymain{
    public static void main(String[] arg){

        Array obj=new Array();
        obj.passArray(new int[]{1,2,3,4,5},4);
    }
    }
 class Array{
 void passArray(int[] values,int size){

   values=new int[size];
        for (int num=0;num<values.length;num++){
            System.out.println(values[num]);

        }
    }

}
OUPTPUT:
0
0
0
0

Answer 1

values=new int[size];

You are initializing a new array, overwriting the passed parameter.

When creating a new array this way, all values are initialized with their default values, for int this happens to be 0.

Simply remove this line, and the code should work as intended.

And, as a comment points out, this makes the parameter size unused. The length of the array is derived directly from the array, as you already do in your code.

Answer 2

You need to remove values=new int[size]; from your Array class.

You are getting values as parameter, and then you are doing this values=new int[size]; , which creates a new array, and this new array has no values (default values 0).

Answer 3

The problem is the line

values=new int[size]

You are creating a new array, and thereby you are hiding the one with non-0 values.