List 练习

（List）已知有一个Worker 类如下： 

public 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”); } } 

完成下面的要求 

1) 创建一个List，在List 中增加三个工人，基本信息如下：

姓名 年龄 工资 

zhang3 18 3000 

li4 25 3500 

wang5 22 3200 

2) 在li4 之前插入一个工人，信息为：姓名：zhao6，年龄：24，工资3300 

3) 删除wang5 的信息 

4) 利用for 循环遍历，打印List 中所有工人的信息 

5) 利用迭代遍历，对List 中所有的工人调用work 方法。 

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class List2 {

    public static void main(String[] args)
    {
        List<Worker> list = new ArrayList<>() ;
        
        list.add(new Worker("zhang3" , 18 , 3000 ) ) ;
        list.add(new Worker("li4" , 25 , 3500 ) ) ;
        list.add(new Worker("wang5" , 22 , 3200 ) ) ;
        
        System.out.println("开始时工人状况为：");
        for(Worker x : list)
        {
            System.out.println(x+" ");
        }
        
        System.out.println("li4之前插入zhao6：");
        
        list.add(1, new Worker("zhao6" , 24 , 3300 ));
        
        for(Worker x : list)
        {
            System.out.println(x+" ");
        }
        
        System.out.println("删除wang5：");
        
        list.remove(3) ;
        
        for(Worker x : list)
        {
            System.out.println(x+" ");
        }
        
        System.out.println("迭代：");
        
        Iterator<Worker> it = list.iterator() ;

        while(it.hasNext())
        {
            Worker w = it.next() ;
            
            w.work();
        }
    }

}


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"); 
    }

    @Override
    public String toString() {
        return name+" "+age+" "+salary;
    }
    
    
}