Mega Code Archive
This program demonstrates object construction
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/*
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/>.
*/
import java.util.Random;
/**
* This program demonstrates object construction.
*
* @version 1.01 2004-02-19
* @author Cay Horstmann
*/
public class ConstructorTest {
public static void main(String[] args) {
// fill the staff array with three Employee objects
Employee[] staff = new Employee[3];
staff[0] = new Employee("Harry", 40000);
staff[1] = new Employee(60000);
staff[2] = new Employee();
// print out information about all Employee objects
for (Employee e : staff)
System.out.println("name=" + e.getName() + ",id=" + e.getId() + ",salary=" + e.getSalary());
}
}
class Employee {
// three overloaded constructors
public Employee(String n, double s) {
name = n;
salary = s;
}
public Employee(double s) {
// calls the Employee(String, double) constructor
this("Employee #" + nextId, s);
}
// the default constructor
public Employee() {
// name initialized to ""--see below
// salary not explicitly set--initialized to 0
// id initialized in initialization block
}
public String getName() {
return name;
}
public double getSalary() {
return salary;
}
public int getId() {
return id;
}
private static int nextId;
private int id;
private String name = ""; // instance field initialization
private double salary;
// static initialization block
static {
Random generator = new Random();
// set nextId to a random number between 0 and 9999
nextId = generator.nextInt(10000);
}
// object initialization block
{
id = nextId;
nextId++;
}
}
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