#千锋逆战班#

最新推荐文章于 2020-03-17 22:28:57 发布

原创最新推荐文章于 2020-03-17 22:28:57 发布 · 125 阅读

CC 4.0 BY-SA版权

本文深入探讨了Java内部类的各种类型，包括成员内部类、静态内部类、局部内部类和匿名内部类的特点与使用场景。同时，文章还讲解了如何重写Object类的方法，如equals方法的正确实现方式，以及getClass方法的应用。通过具体代码示例，读者可以更好地理解这些概念。

在千锋学习的第二十天

中国加油！武汉加油！千锋加油！我自己也加油！

今天学习就内部类中的成员内部类，静态内部类，局部内部类，和匿名内部类，以及Object方法

package com.qfe.day20.t2;

public class TestStudent {

	public static void main(String[] args) {
			Student stu =new Student();
			Student stu2 =new Student(18,"tom");
			System.out.println(stu);
			System.out.println(stu2);
	}

}
class Student{
	private int age ;
	private String name;
	public Student(){}
	public Student(int age, String name) {
		super();
		this.age = age;
		this.name = name;
	}
	public String toString(){
		return name +  " "    +age;
	}




null 0
tom 18

package com.qfe.day20.t2;

public class TestEquals {

	public static void main(String[] args) {
			String str1 =new String("HELLO");
			String str2 =new String("HELLO");
			System.out.println(str1.equals(str2));
			System.out.println(str1==str2);

	}

}


true
false

package com.qfe.day20.t2;

public class TestGetClass {

	public static void main(String[] args) {
			Animal a1 =new Dog();
			Animal a2 =new Animal();
				System.out.println(a1 instanceof Animal);
				System.out.println(a1.getClass()==a2.getClass());

	}

}
class Animal{}
class Dog extends Animal{}


true
false

A B C D

package com.qfe.day20.t2;

public class TestWorker {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Worker worker= new Worker("tom",25,"male",99.5);
		Worker worke= new Worker("jack",25,"male",99.5);
		System.out.println(worker.equals(worke));
		 System.out.println(worke);
		 System.out.println(worker);
	}

}
class Worker{
	String name;
	int age ;
	String sex;
	double score;
	public Worker(String name, int age, String sex, double score) {
		super();
		this.name = name;
		this.age = age;
		this.sex = sex;
		this.score = score;
	}
	@Override
	public String toString() {
		return  name +  age+ sex+score;
	}
	
	public boolean equals(Object obj){
		//比较两个对象的地址是否一样、
		if(this ==obj){
			return true;
		}
		//确定对象不是非空
		if(obj ==null){
			return false;
		}
		//确认类型
		if(this.getClass()!=obj.getClass()){
			return false;
		}
		 //转型（转型的前提是类型肯定是Worker）
		Worker stu =(Worker)obj;
		//比较内容
		if(this.name.equals(stu.name)&&this.age==age&&this.sex.equals(stu.sex)&&this.score==score){
			
			return true;
		}
		
		return false;
		//比较两个对象的地址是否一样
		
	}
	
}

false
jack	25		male	99.5
tom	25		male	99.5

A B D

package com.qfe.day20.t2;

public class TestLamp {

	public static void main(String[] args) {
			Lamp lamp =new Lamp();
			class RedLight implements Light{

				@Override
				public void shine() {
					System.out.println("shine in red");
					
				}
				
				
			}
			lamp.on(new RedLight());
			lamp.on(
					new Light(){
						public void shine(){
						System.out.println("shine in yellow");
					}
					}	
	);
	}

}
interface Light{
	void shine();
}
class Lamp{
	public void on(Light light){
		light.shine();
	}
}

shine in red
shine in yellow