Quick question about java.

So if I have two objects from the main class and I'm trying to add them together. how can I create a method to add whatever those two objects?

I tried to do it here but I could not finish it.

package Bright;

public class partic { public int conNumber; public partic(int number) { conNumber = number; } public partic add(partic sum) {

return null; } }

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package Bright;

public class particDemo { public static void main (String[] args) { partic val1 = new partic(23); System.out.println("val one is " + val1.conNumber); partic val2 = new partic(54); System.out.println("val one is " + val2.conNumber); partic sum; sum = val1.add(val2); System.out.println("The sum: " + sum); } }