千峰逆战班，Day23

在千峰“逆战班”学习的第23天
今天不容易，明天会更难，但是后天会很美好
今天的学习内容是集合，Collection父接口下的List接口下的ArrayList、Vector、LinkedList实现类
中国加油！武汉加油！千峰加油！我自己加油！！！

作业：
2.
1）补充如下代码：

for(int i = 0; i < list.size(); i++){
	System.out.print(list.get(i) + "\t");
}

2）运行结果：Hello Java Learn World
3）将List list = new ArrayList();更改为List list = new LinkedList();
ArrayList是数组类型结构，需要开辟连续的存储空间，查询快，增删慢
LinkedList是链表类型结构，不需要开辟连续的存储空间，增删快，查询慢
4）将List list = new ArrayList();更改为List list = new Vector();
ArrayList运行效率快，线程不安全
Vector运行效率慢，线程安全

3.运行结果：
Hello
Learn
5.

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class TestWorker{
	public static void main(String[] args){
		List list = new ArrayList();
		Worker w1 = new Worker("zhang3",18,3000.0);
		Worker w2 = new Worker("li4",25,3500.0);
		Worker w3 = new Worker("wang5",22,3300.0);
		Worker w4 = new Worker("zhao6",24,3300.0);
		list.add(w1);
		list.add(w2);
		list.add(w3);
		list.add(1, w4);
		list.remove(3);
		for(int i = 0; i < list.size(); i++){
			System.out.println(list.get(i).toString());
		}
	}
}
class Worker{
	private int age;
	private String name;
	private double salary;
	public Worker(){}
	public Worker(String name,int age,double salary){
		this.name = name;
		this.age = age;
		this.salary = salary;
	}
	public int getAge(){
		return age;
	}
	public void setAge(int age){
		this.age = age;
	}
	public String getName(){
		return name;
	}
	public void setName(String name){
		this.name = name;
	}
	public double getSalary(){
		return salary;
	}
	public void setSalary(double salary){
		this.salary = salary;
	}
	public void work(){
		System.out.println(name + " work");
	}
	public String toString(){
		return name + "\t" + age + "\t" + salary;
	}
	public boolean equals(Object obj){
		if(this == obj){
			return true;
		}
		if(obj == null){
			return false;
		}
		if(obj.getClass() != this.getClass()){
			return false;
		}
		Worker worker = (Worker)obj;
		if(this.name.equals(worker.name) && this.age == worker.age && this.salary == worker.salary){
			return true;
		}
		return false;
	}
}