This program demonstrates static methods : Static « Class « Java

This program demonstrates static methods

 This program is a part of the companion code for Core Java 8th ed.

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <>.

 * This program demonstrates static methods.
 * @version 1.01 2004-02-19
 * @author Cay Horstmann
public class StaticTest {
  public static void main(String[] args) {
    // fill the staff array with three Employee objects
    Employee[] staff = new Employee[3];

    staff[0] = new Employee("Tom", 40000);
    staff[1] = new Employee("Dick", 60000);
    staff[2] = new Employee("Harry", 65000);

    // print out information about all Employee objects
    for (Employee e : staff) {
      System.out.println("name=" + e.getName() + ",id=" + e.getId() + ",salary=" + e.getSalary());

    int n = Employee.getNextId(); // calls static method
    System.out.println("Next available id=" + n);

class Employee {
  public Employee(String n, double s) {
    name = n;
    salary = s;
    id = 0;

  public String getName() {
    return name;

  public double getSalary() {
    return salary;

  public int getId() {
    return id;

  public void setId() {
    id = nextId; // set id to next available id

  public static int getNextId() {
    return nextId; // returns static field

  public static void main(String[] args) // unit test
    Employee e = new Employee("Harry", 50000);
    System.out.println(e.getName() + " " + e.getSalary());

  private String name;

  private double salary;

  private int id;

  private static int nextId = 1;


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