# Java Inheritance Example
## Example1
App.java

public class App{
     public static void main(String []args){
        Employee emp = new Employee();
        emp.setName("James");
     }
}

Employee.java

public class Employee{
    int age;
    String name;
    public void setName(String name){
        this.name = name;
        System.out.printf("My Name is %s",this.name);
    }
    public String getName(){
        return this.name;
    }
}

## Example2
Employee.java

import java.util.Date;
public class Employee {
    protected String name;
    protected Date hireDate;
    public Employee(){}
    public Employee(String theName, Date theDate){
        name = theName;
        hireDate = theDate;
    }
    public Date getHireDate(){
        return hireDate;
    }
    public String getName(){
        return name;
    }
}

HourlyEmployee.java

import java.util.Date;
public class HourlyEmployee extends Employee{
    private double wageRate;
    public HourlyEmployee(String theName, Date theDate, double rate){
        name = theName;
        hireDate = theDate;
        wageRate = rate;
    }
}

Company.java

import java.util.Date;
public class Company {
    public static void main(String[] args){
        HourlyEmployee hourlyEmployee = new HourlyEmployee("Josephine", new Date(114,0,1), 100);
        System.out.println(hourlyEmployee.getName());
    }
}

## Example 3
Employee.java

import java.util.Date;
public class Employee {
    protected String name;
    protected Date hireDate;
    public Employee(){}
    public Employee(String theName, Date theDate){
        name = theName;
        hireDate = theDate;
    }
    public Date getHireDate(){
        return hireDate;
    }
    public String getName(){
        return name;
    }
    public double getSalary(int hour){
        return 1000.0*hour;
    }
}

HourlyEmployee.java

import java.util.Date;
public class HourlyEmployee extends Employee{
    private double wageRate;
    public HourlyEmployee(String theName, Date theDate, double rate){
        name = theName;
        hireDate = theDate;
        wageRate = rate;
    }
    public double getSalary(int hour){
        return wageRate*hour;
    }
}

Company.java

import java.util.Date;
public class Company {
    public static void main(String[] args){
        HourlyEmployee hourlyEmployee = 
            new HourlyEmployee("Josephine", new Date(114,0,1), 100);
        System.out.println(hourlyEmployee.getSalary(24));
    }
}

## Example 4
Employee.java

import java.util.Date;
public class Employee {
    protected String name;
    protected Date hireDate;
    public Employee(){}
    public Employee(String theName, Date theDate){
        name = theName;
        hireDate = theDate;
    }
    public Date getHireDate(){
        return hireDate;
    }
    final public String getName(){
        return name;
    }
    public double getSalary(int hour){
        return 1000.0*hour;
    }
}

HourlyEmployee.java

import java.util.Date;
public class HourlyEmployee extends Employee{
    private double wageRate;
    public HourlyEmployee(String theName, Date theDate, double rate){
        name = theName;
        hireDate = theDate;
        wageRate = rate;
    }
    public double getSalary(int hour){
        return wageRate*hour;
    }
    // 看看把下面反註解會發生甚麼事
    // public String getName(){
    //     return name;
    // }
}

Company.java

import java.util.Date;
public class Company {
    public static void main(String[] args){
        HourlyEmployee hourlyEmployee = 
            new HourlyEmployee("Josephine", new Date(114,0,1), 100);
        System.out.println(hourlyEmployee.getName());
    }
}

## Example 5
B.java

class A {
    int a;
    public A() { 
        a = 7;
        System.out.println("Step 1");
    }
}
class B extends A {
    public B() {
        System.out.println("Step 2");

    }
    public static void main(String[] args){
        B bo = new B();
    }
}

## Example 6
Employee.java

import java.util.Date;
public class Employee {
    private String name;
    protected Date hireDate;
    public Employee(){}
    public Employee(String theName, Date theDate){
        name = theName;
        hireDate = theDate;
    }
    public Date getHireDate(){
        return hireDate;
    }
    public String getName(){
        return name;
    }
}

HourlyEmployee.java

import java.util.Date;
public class HourlyEmployee extends Employee{
    private double wageRate;
    public HourlyEmployee(String theName, Date theDate, double rate){
        name = theName;
        hireDate = theDate;
        wageRate = rate;
    }
    public double getSalary(int hour){
        return wageRate*hour;
    }
    public String getName(){
        return "Hourly Employee:" + super.getName();
    }
}

Company.java

import java.util.Date;
public class Company {
    public static void main(String[] args){
        HourlyEmployee hourlyEmployee = 
            new HourlyEmployee("Josephine", new Date(114,0,1), 100);
        System.out.println(hourlyEmployee.getName());
    }
}

## Example 7

import java.util.Date;
public class Employee {
    private String name;
    private Date hireDate;
    public Employee(){}
    public Employee(String theName, Date theDate){
        name = theName;
        hireDate = theDate;
    }
    public Date getHireDate(){
        return hireDate;
    }
    public String getName(){
        return name;
    }
    public boolean equals(Employee otherone){
        if(otherone.getName().equals(this.name) && otherone.getHireDate().equals(this.hireDate)){
            return true;
        }else{
            return false;
        }
    }
}

## Example 8

import java.util.Date;
public class CompareTest {
    public static void main(String[] args) {
        Employee employeeA = new Employee("Josephine", new Date(114,0,1));
        Employee employeeB = new Employee("Josephine", new Date(114,0,1));
        
        System.out.println(employeeA.equals(employeeB));
        
        System.out.println(employeeA == employeeB);
        if(employeeA instanceof Employee){
            System.out.println(employeeA.getName() + "is an object of Employee");
        }
        System.out.println(employeeA.getClass().getName());
    }
}