package testFile2; class colc{ private int a=10; private int b=20; private int result; public colc(int a, int b) { this.a = a; this.b = b; this.result = 0; } public void setA(int a) { this.a = a; } public void setB(int b) { this.b = b; } public void Add() { result += a + b; } public void printAdd() { Add(); System.out.println(result); } } public class Execute { public static void main(String[] a..