首先先建立一個類：

package collection;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

public class Employ {//javabean 實體類  java豆 只包含屬性和
     private int id;
     private String name;
     private int salary;
     private String department;
     private Date hiredata;
     
     DateFormat format
 
=new SimpleDateFormat("yyyy-yy");
     
     
         
      
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    
    public Employ(int id, String name, int salary, String department,
            String hiredata) {
        super();
        
 
this.id = id;
        this.name = name;
        this.salary = salary;
        this.department = department;
        //this.hiredata = hiredata;
        DateFormat format=new SimpleDateFormat("yyyy-yy");
        try {
            this.hiredata=format.parse(hiredata);
        } catch (Exception e) {
            
 
// TODO: handle exception
        } 
    }
    public Employ() {
        // TODO Auto-generated constructor stub
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getSalary() {
        return salary;
    }
    public void setSalary(int salary) {
        this.salary = salary;
    }
    public String getDepartment() {
        return department;
    }
    public void setDepartment(String department) {
        this.department = department;
    }
    public Date getHiredata() {
        return hiredata;
    }
    public void setHiredata(Date hiredata) {
        this.hiredata = hiredata;
    }
     
}

測試主函數：

package collection;

import java.util.ArrayList;

public class Datacuncu {
     public static void main(String[] args) {
    	 //一行記錄一個對象來封裝
	Employ e=new Employ(0301,"kl",3000,"yc","2007-10");
	Employ e1=new Employ(0301,"kla",3200,"ycs","2007-10");
	Employ e2=new Employ(0301,"kls",3500,"yca","2007-10");
	ArrayList<Employ>list=new ArrayList<Employ>();
	list.add(e);
	list.add(e1);
	list.add(e2);
	printEmploy(list);
 }
     public static void  printEmploy(ArrayList<Employ> list) {
		for (int i = 0; i < list.size(); i++) {
		System.out.println(list.get(i).getName());
		System.out.println(list.get(i).getHiredata());
		System.out.println(list.get(i).getDepartment());
		}
	}
}
 
運行結果：

java--用一個對象實現集合