\\以下是代码部分
import java.util.*;
/**
* This program demonstrates equals test
* @author Wuchangyu
* @version 1.11 2004-02-21
*/
class EqualsTset {
public static void main(String[] args) {
// TODO 自动生成的方法存根
Employee alice1=new Employee("Alice Adams",75000,1987,12,15);
Employee alice2=alice1;
Employee alice3=new Employee("Alice Adams",75000,1987,12,15);
Employee bob=new Employee("Bob Brandson",50000,1989,10,1);
System.out.println("alice1==alice2: "+(alice1==alice2));
System.out.println("alice1==alice3: "+(alice1==alice3));
System.out.println("alice1.euqals(alice3): "+alice1.equals(alice3));
System.out.println("alice1.equals(bob): "+alice1.equals(bob));
System.out.println("bob.toString: "+bob);
Manager carl=new Manager("Carl Cracker",80000,1987,12,15);
Manager boss=new Manager("Carl Cracker",80000,1987,12,15);
boss.setBonus(5000);
System.out.println("boss.toString: "+boss);
System.out.println("carl.equals(boss): "+carl.equals(boss));
System.out.println("alice1.hashCode(): "+alice1.hashCode());
System.out.println("alice3.hashCode(): "+alice3.hashCode());
System.out.println("bob.hashCode(): "+bob.hashCode());
System.out.println("carl.hashCode(): "+carl.hashCode());
}
}
class Employee
{
public Employee(String n,double s,int year,int month,int day)
{
name=n;
salary=s;
GregorianCalendar calendar=new GregorianCalendar(year,month-1,day);
hireDay=calendar.getTime();
}
public double getSalary()
{
return salary;
}
public Date getHireDay()
{
return hireDay;
}
public void raiseSalary(double byPercent)
{
salary*=1+byPercent/100;
}
public boolean equals(Object otherObject)
{
//a quick test to see if the objects are identical
if(this==otherObject)return true;
//must return false if the explicit parameter is null
if(otherObject==null)return false;
//if the classes don't match, they can't be equal
if(getClass()!=otherObject.getClass())return false;
//now we know otherObject is a non-null Employee
Employee other=(Employee) otherObject;