package super关键字;

public class Person {
	protected String username;//protected 子类可以访问到
	
	public Person(String username) {
		this.username = username;
	}
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public Person() {
		System.out.println("Person()");
	}
	public void walk() {
		System.out.println("person is walking.....");
	}
}

package super关键字;

public class Consumer extends Person {//这就表达继承
	//private String username;
	
	public Consumer() {
		System.out.println("Consumer()");
	}
	public Consumer(String username) {
		this.setUsername(username);
	}

	@Override
	public void walk() {
		super.walk();
		System.out.println("Consumer is walking....");
		System.out.println("Boss is dancing....");
	}
}

package super关键字;

public class Test {

	public static void main(String[] args) {

		//实例化Consumer，并给username属性赋值
		Consumer c = new Consumer("zhangsan");//第二种
//		c.setUsername("zhangsan");//第一种
		System.out.println(c.getUsername());
	}
}

package super关键字;

public class Consumer extends Person {//这就表达继承
	//private String username;
	
	public Consumer() {
		super();//这里有没有这个super()效果是一样的，因为子类实例化时一定是先实例化其父类，然后才实例化子类。
		System.out.println("Consumer()");
	}
	
//	public Consumer() {
//		super();
//	}
	public Consumer(String username) {
//		this.setUsername(username);
		//可以调用父类构造器：实现给username属性赋值的目的
//		super(username);//调用父类构造器 使用super关键字不但可以访问父类构造器还可以访问父类属性父类行为
		super.username = username;//super关键字 可以访问父类的非私有属性
		super.walk();
	}

	@Override
	public void walk() {
		super.walk();
		System.out.println("Consumer is walking....");
		System.out.println("Boss is dancing....");
	}
}