Method prototype for the method compute which accepts two integer arguments and returns true/false.

1. void compute (int a, int b)
2. boolean compute (int a, int b)
3. Boolean compute (int a,b)
4. int compute (int a, int b)

Consider the following program segment and answer the questions below:

class calculate

{
  int a; double b; 
  calculate()

  {

  a=0; 
  b=0.0;

  }

  calculate(int x, double y)

  {

  a=x;
  b=y;

  }

void sum()

{

  System.out.println(a*b);

}}

Name the type of constructors used in the above program segment?

Invoking a method by passing the objects of a class is termed as:

1. Call by reference
2. Call by value
3. Call by method
4. Call by constructor