6、Java高级类设计与接口设计全解析

Java高级类设计与接口设计全解析

1. 高级类设计复习题解析

在Java编程中，类的设计至关重要，下面通过一系列复习题来深入理解高级类设计的相关概念。

1.1 员工类的 equals 和 hashCode 方法

public class Employee {
    public int employeeId;
    public String firstName, lastName;
    public int yearStarted;
    @Override public int hashCode() {
        return employeeId;
    }
    public boolean equals(Employee e) {
        return this.employeeId == e.employeeId;
    }
    public static void main(String[] args) {
        Employee one = new Employee();
        one.employeeId = 101;
        Employee two = new Employee();
        two.employeeId = 101;
        if (one.equals(two)) System.out.println("Success");
        else System.out.println("Failure");
    } 
}