package top.qaqaq.java.P313;

import java.util.Objects;

public class Person {

	String name;
	int age;

	public Person(String name, int age) {
		this.name = name;
		this.age = age;
	}

	public void eat() {
		System.out.println("人：吃饭");
	}

	public void walk() {
		System.out.println("人：走路");
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		Person other = (Person) obj;
		return age == other.age && Objects.equals(name, other.name);
	}

//	@Override
//	public boolean equals(Object obj) {
//		if(obj == this) {
//			return true;
//		}
//		
//		if(obj instanceof Person) {
//			Person p = (Person)obj;
//			return this.age == p.age && this.name.equals(p.name);
//		}
//		
//		return false;
//	}
}

package top.qaqaq.java.P313;

public class Man extends Person {
	
	public Man(String name, int age) {
		super(name, age);
	}

	public void earnMoney() {
		System.out.println("男人负责挣钱养家");
	}
	
	public void eat() {
		System.out.println("男人多吃肉，长肌肉");
	}
	
	public void walk() {
		System.out.println("男人霸气的走路");
	}
}

package top.qaqaq.java.P313;

import org.junit.Test;

public class ReviewTest {

	//关于toString()
	@Test
	public void test3() {
		String s = "abc";
		s = null;
		System.out.println(s);
		System.out.println("********************");
		System.out.println(s.toString());//出现NullPointerException
		
	}
	
	//区别手动写的和自动生成的equals()
	@Test
	public void test2() {
		Person p = new Person("Tom", 12);
		Man m = new Man("Tom", 12);
		
		System.out.println(p.equals(m));
		
		
	}
	
	//数组也作为Object类的子类出现，可以调用Object类中声明的方法
	@Test
	public void test1() {
		int[] arr = new int[] {1,2,3};
		print(arr);
		
		System.out.println(arr.getClass().getSuperclass());
	}
	
	public void print(Object obj) {
		System.out.println(obj);
	}
}