java面向对象的三大特性之一继承用法实例分析

package com.jredu.oopch02;
/**
 * 工程师类
 * @author Administrator
 *
 */
public class Engineer {
    //共有的属性和方法
    //子类可以继承
    protected int id;
    protected String name;
    protected String enterTime;
    public Engineer(int id, String name, String enterTime) {
        super();
        this.id = id;
        this.name = name;
        this.enterTime = enterTime;
    }
    public void showInfo() {
        System.out.println("编号:"+id+",姓名："+name+",入职时间："+enterTime);
    }
}

package com.jredu.oopch02;
/**
 * 软件工程师 继承工程师类
 * @author Administrator
 *
 */
public class SoftEnigneer extends Engineer {
    //独有的属性和方法
    private String type;//语言类型
    public SoftEnigneer(int id, String name, String entertime,String type) {
        super(id, name, entertime);
        // TODO Auto-generated constructor stub
        this.type=type;
    }
    public void coding(){
        System.out.println("正在编程");
    }
    @Override
    public void showInfo() {
        // TODO Auto-generated method stub
        super.showInfo();
        System.out.println("语言类型是"+type);
    }
}

package com.jredu.oopch02;
/**
 * 测试工程师继承工程师类
 * @author Administrator
 *
 */
public class TestEngineer extends Engineer {
    private String lever;
    public TestEngineer(int id, String name, String entertime,String lever) {
        super(id, name, entertime);
        // TODO Auto-generated constructor stub
        this.lever = lever;
    }
    public void test(){
        System.out.println("正在测试");
    }
    /**
     * 方法重写
     * 方法重写的默认行为是：调用父类方法内容
     * 方法重写：可以在子类中修改父类的方法内容
     */
    @Override  //@Override：是重写。注解标识是@
    public void showInfo() {
        // TODO Auto-generated method stub
        super.showInfo();//调用父类的方法
        System.out.println(",等级："+lever);
    }
}

package com.jredu.oopch02;
public class Teste {
    public static void main(String[] args) {
        //调用父类中定义的方法结果：
        //1、如果子类没有重写父类的方法：调用的就是父类的实现
        //2、如果子类重写了父类的方法，调用的就是子类中的实现
        SoftEnigneer soft = new SoftEnigneer(1, "张三", "2015-03-06", "java");
        soft.showInfo();
        soft.coding();
        TestEngineer test = new TestEngineer(2, "李四", "2016-03-06", "测试");
        test.showInfo();
        test.test();
    }
}