public class A {

  private int data1 = 1;
  private double data2;
  private boolean data3;
  private String data4;

  public A() {
  }

  public int getData1() {
    return data1;
  }
  public double getData2() {
    return data2;
  }
  public boolean getData3() {
    return data3;
  }
  public String getData4() {
    return data4;
  }

  public static void main(String[] args) {

    A a = new A();
    System.out.println(a.getData1());
    System.out.println(a.getData2());
    System.out.println(a.getData3());
    System.out.println(a.getData4());
  }
}