Consider and give the output of the following program: class report { int a, b; report() { a = 10; b = 15; } report(int x, int y) { a = x; b = y; } void print() { System.out.println(a * b); } static void main() { report r = new report(); r.print(); report p = new report(4, 5); p.print(); } }

150 20

The class has two constructors — this is constructor overloading, and which one runs depends on the arguments supplied. Object r is created with no arguments, so the non-parameterised constructor runs and sets a = 10, b = 15. r.print() displays 10 * 15 = 150. Object p is created with (4, 5), so the parameterised constructor runs and sets a = 4, b = 5. p.print() displays 4 * 5 = 20. Each object keeps its own copy of a and b, which is why creating p does not disturb the values inside r.