This program demonstrates static methods
/*
This program is a part of the companion code for Core Java 8th ed.
(http://horstmann.com/corejava)
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
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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 <http://www.gnu.org/licenses/>.
*/
/**
* 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) {
e.setId();
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
nextId++;
}
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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