Methods

public class Calculator {
  public int add(int a, int b) {
    return a + b;
  }

  public void greet(String name) {
    System.out.println("Hello, " + name);
  }

  public static void main(String[] args) {
    Calculator calc = new Calculator();
    System.out.println(calc.add(3, 4)); // 7
    calc.greet("Ali");
  }
}