java集合——题4,6-白红宇

java集合——题4,6

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发布时间：2019-06-20

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4、（List）写一个函数reverseList，该函数能够接受一个List，然后把该List 倒序排列。例如：

List list = new ArrayList();

list.add(“Hello”);

list.add(“World”);

list.add(“Learn”); //此时list 为Hello World Learn

reverseList(list); //调用reverseList 方法之后，list 为Learn World Hello

import java.util.ArrayList;import java.util.Iterator;import java.util.List;import com.JiHe.test.Person;public class DaoXu {    public static void main(String[] args) {        // TODO 自动生成的方法存根        List
     
       list =new ArrayList<>();        List
      
        reverselist=new ArrayList<>(3);        list.add("Hello\t");        list.add("World\t");        list.add("Learn\t");        System.out.print("list= ");        for(String str:list){            System.out.print(str);        }        System.out.println();        for(int i=list.size()-1;i>=0;i--){            reverselist.add(list.get(i));        }        System.out.print("reverselist= ");        for(String str:reverselist){            System.out.print(str);        }    }}

6、（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 Work {    private int age;    private String name;    private double salary;    public Work(){            }    public Work(String name,int age,double salary){        this.name=name;        this.age=age;        this.salary=salary;    }    public void work(){        System.out.println(name+" work");    }    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;    }            @Override    public String toString() {        return "Work [Age=" + getAge() + ", Name=" + getName() + ", Salary=" + getSalary() + "]";    }    public static void main(String[] args){        List
     
       list = new ArrayList<>();        list.add(new Work("zhang3",18,3000));        list.add(new Work("li4",25,3500));        list.add(new Work("wang5",22,3200));        list.add(1,new Work("zhao6",24,3300));        list.remove(3);        for(Work w:list){            System.out.println(w);        }        Iterator
      
        it =list.iterator();        while(it.hasNext()){            it.next().work();        }    }}