集合

List

  package com.set;
  import java.util.*;

  public class ListDome1 {

     public static void main(String[] args) {
    //用ArrayList存储编程语言的名称，并输出
    List list=new ArrayList();
    list.add("Java");
    list.add("C");
    list.add("C++");
    list.add("Go");
    list.add("swift");
    //输出列表中元素的个数
    System.out.println("列表中元素的个数为："+list.size());
    
    //遍历输出所有的编程语言
    System.out.println("**************");
    for(int i=0;i<list.size();i++) {
        System.out.print(list.get(i)+",");
    }
    
    //移除列表中的C++
    System.out.println();
    //list.remove(2);
    list.remove("C++");
    System.out.println("*****************");
    System.out.println("移除C++以后的元素：");
    for(int i=0;i<list.size();i++) {
        System.out.print(list.get(i)+",");
    }
            System.out.println();
    //查看ArrayList中是否包含“Java”
    System.out.println("*******************");
    System.out.println(list.contains("Java"));
    
  }

}

list测试2

public class ArrayListDemo {
 public static void main(String[] args) {
    //用ArrayList存储学科的名称
    List list=new ArrayList();
    list.add("语文");
    list.add("数学");
    list.add("英语");
    list.add("化学");
    list.add("物理");
    list.add("生物");
    
    //输出列表中元素的个数
    System.out.println("列表中元素的个数为："+list.size());
    
    //遍历输出所有列表元素
    for(int i=0;i<list.size();i++) {
        System.out.println("第"+(i+1)+"个为"+list.get(i));
      }

    }
}

ArraysList测试

package com.set;

import java.util.Date;

public class Notice {
    private int id;//ID
    private String title;//标题
    private String creator;//创建人
    private Date createTime;//创建时间
  public Notice(int id, String title, String creator, Date createTime) {
      super();
      this.id = id;
      this.title = title;
      this.creator = creator;
      this.createTime = createTime;
  }
       public int getId() {
       return id;
  }
  public void setId(int id) {
      this.id = id;
  }
  public String getTitle() {
      return title;
  }
public void setTitle(String title) {
    this.title = title;
}
public String getCreator() {
    return creator;
}
public void setCreator(String creator) {
    this.creator = creator;
}
public Date getCreateTime() {
    return createTime;
}
public void setCreateTime(Date createTime) {
    this.createTime = createTime;
  }

}

测试类

package com.set;

import java.util.*;

public class NoticeTest {

public static void main(String[] args) {
    // 创建Notice类的对象，生成三条公告
    Notice notice1=new Notice(1,"欢迎来到java世界！","管理员",new Date());
    Notice notice2=new Notice(2,"按时完成作业！","老师",new Date());
    Notice notice3=new Notice(3,"考勤通知！","老师",new Date());
    
    //添加公告
    ArrayList noticeList=new ArrayList();
    noticeList.add(notice1);
    noticeList.add(notice2);
    noticeList.add(notice3);
    
    //显示公告
    System.out.println("公告的内容为：");
    for(int i=0;i<noticeList.size();i++) {
        System.out.println(i+1+":"+((Notice)(noticeList.get(i))).getTitle());
    }

}

}

ArraysList测试2

package com.set;
import java.util.*;
public class Employee {
    private int id;//ID
    private String name;//姓名
    private double salary;//薪资
    

    public Employee(int id, String name, double salary) {
        super();
        this.id = id;
        this.name = name;
        this.salary = salary;
    }


    public int getId() {
        return id;
    }


    public void setId(int id) {
        this.id = id;
    }


    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;
    }


}

测试类

package com.set;

import java.util.*;

public class EmployeeTest {
public static void main(String[] args) {

//创建三个EmployeeTest类的对象
Employee em1=new Employee(1,"张三",5000);
Employee em2=new Employee(2,"李四",5500);
Employee em3=new Employee(3,"赵六",4000);

//添加员工信息到ArrayLis中
ArrayList emlist=new ArrayList();
emlist.add(em1);
emlist.add(em2);
emlist.add(em3);

//显示员工的姓名和薪资
System.out.println("员工姓名"+" "+"员工薪资");
for(int i=0;i<emlist.size();i++) {
    
    System.out.println((((Employee)(emlist.get(i))).getName())+"         "+((Employee)(emlist.get(i))).getSalary());
    
    }
}

}