Array Help

[PreetiSweet]

For my Java 101 class we have to get the two numbers to 'swap', this is what my professor gave us and he says that we need to fix the array to get the output to swap.

Right now it just outputs the same thing twice, I can't figure out the new array.
Help meee, please and thanks.

public class cw328swap {

    public static void main(String[] args) {

    	int [] a = {1,2};
    	System.out.println(a[0] + " g " + a[1]);
    	swap(a[0], a[1]);
    	System.out.println(a[0] + " g " + a[1]);
    }
    public static void swap (int n1, int n2) {
    	int temp=n1;
    	n1=n2;
    	n2=temp;
    }
}

[doWhile]

Suggested reading: Does Java pass by reference or pass by value? - JavaWorld...which should address the root of your problem. Fix is to do the swap on the array, not its values.

[PreetiSweet]

Thank you! I'm still having a little trouble figuring it out though.

I keep getting the errors .class expected or identifier expected.

[Junky]

When posting code use code tags. Place [ code ] before and [ /code ] after (without the spaces). Also copy and paste the exact error message(s) you get.

[PreetiSweet]

Okay, I'm just overall confused. I know this is probably really elementary, thanks for the help.

public class cw328swap {

    public static void main(String[] args) {

    	int [] a = {1,2};
    	System.out.println(a[0] + " g " + a[1]);
    	swap(a[], a[]);
    	System.out.println(a[0] + " g " + a[1]);
    }
    public static void swap ( int n1, int n2) {
    	int temp=n1;
    	n1=n2;
    	n2=temp;
    }
}

'.class' expected line 9 //swap(a[], a[]);
'.class' expected line 9

[Junky]

swap(a[], a[]);

This is not legal syntax. Compare with your original code.

[PreetiSweet]

swap(a[0], a[1]);

I was told that a[0] and a[1] are not arrays and that this is why the output does not get swapped, so I tried taking out the numbers.

I don't know how to change the that to make it an array.

[Junky]

But the square brackets are used to access a single element inside the array at the specified index. If you want to refer to the entire array then just use the variable name.

[PreetiSweet]

Ohh thank you!