List<T> 集合

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

public class TestClass 
{
    public static void main(String[] args) 
    {        
        int i = 1;
        String str = "ROSE";
        Date date = new Date();
        
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//2017-08-08 20:28:38
        String time = format.format(date);

        List<Object> list = new ArrayList<Object>();
        list.add(i);
        list.add(str);
        list.add(date);
        list.add(time);

        for (Object obj : list) 
        {
            System.out.println(obj);
        }
    }
} 

1
ROSE
Tue Aug 08 20:43:11 CST 2017
2017-08-08 20:43:11

 

 

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

public class TestClass 
{
    public static void main(String[] args) 
    {        
        ListTest();
        
        System.out.println();
        
        DictTest();
    }
    
    //集合
    private static void ListTest()
    {
        int i = 1;
        String str = "ROSE";
        Date date = new Date();
        
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String time = format.format(date);

        List<Object> list = new ArrayList<Object>();
        list.add(i);
        list.add(str);
        list.add(date);
        list.add(time);

        for (Object obj : list) 
        {
            System.out.println(obj);
        }        
    }
    
    //字典
    private static void DictTest() 
    {
        int i = 1;
        String str = "ROSE";
        Date date = new Date();

        Map<String, Object> map = new HashMap<String, Object>();
        map.put("FID", i);
        map.put("FName", str);
        map.put("FAddTime", date);

        for (Map.Entry<String, Object> entry : map.entrySet()) 
        {
            System.out.println("key= " + entry.getKey() + " and value= " + entry.getValue());
        }
    }
} 

System.out.println(list);
[1, ROSE, Tue Aug 08 20:43:11 CST 2017, 2017-08-08 20:43:11]

System.out.println(map);
{FName=ROSE, FID=1, FAddTime=Tue Aug 08 20:43:11 CST 2017}