import java.util.ArrayList;

import java.util.LinkedList;

import java.util.List;

public class Worker {

private int age;

private String name;

private double salary;

public Worker(String name, int age, double salary) {

this.name = name;

this.age = age;

this.salary = salary;

}

public int getAge() {

return 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 static void main(String[] args) {

// 例子1

Worker work1 = new Worker("zhang3", 18, 3000);

Worker work2 = new Worker("li4", 25, 3500);

Worker work3 = new Worker("wang5", 22, 3200);

Worker work4 = new Worker("zhao6", 24, 3300);

// 定义列表list，类型是List，实际对象是ArrayList

// 类型定义为接口List，实际使用具体的实现类，属于面向接口编程，提高灵活性

List arrayList = new ArrayList<>();// 使用指定列表存放的类型是Worker类型

arrayList.add(work1);

arrayList.add(work2);

arrayList.add(work3);

arrayList.add(1, work4);

List linkedList = new LinkedList<>();// 使用指定列表存放的类型是Worker类型

System.out.println("总共有工人" + arrayList.size() + "个.");

for (int i = 0; i < arrayList.size(); i++) {

Worker worker = arrayList.get(i);// 不需要类型强转

System.out.println(worker.getName() + "\t" + worker.getAge() + "\t" + worker.getSalary());

}

// 例子2

// List不指定具体类型，不推荐

Worker work5 = new Worker("zhang3", 18, 3000);

List list2 = new ArrayList();// 使用指定列表存放的类型是Worker类型

list2.add(work5);

for (int i = 0; i < list2.size(); i++) {

Worker worker = (Worker) list2.get(i);// 从List拿到的是Object对象，需要类型强转为指定的Worker

System.out.println(worker.getName() + "\t" + worker.getAge() + "\t" + worker.getSalary());

}

// 例子3

// List不指定具体类型，存放的是Worker，实际取出来转换会出错

Worker work6 = new Worker("zhang3", 18, 3000);

List list3 = new ArrayList();// 使用指定列表存放的类型是Worker类型

list3.add(work6);

for (int i = 0; i < list3.size(); i++) {

Vehicle vehicle = (Vehicle) list3.get(i);// 从List拿到的是Worker对象，在类型强转为Vehicle会出错

}

// 例子4

// 定义列表list4，类型是ArrayList，实际对象是ArrayList，没用面向接口，不推荐

Worker work7 = new Worker("zhang3", 18, 3000);

ArrayList list4 = new ArrayList<>();// 使用指定列表存放的类型是Worker类型

list4.add(work7);

}

}