如何顯示最近六個日期java.util.Date？

Question

我去顯示當前的日期和六（6）最後日期

例如：

02/11/2012 
01/11/2012 
31/10/2012 
30/10/2012 
29/10/2012 
28/10/2012 

獲得當天在JAVA我用：

Date date = Calendar.getInstance().getTime(); 
SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd"); 
System.out.println("current day : "+sdf.format(date)); 

但怎麼辦我減少日子？

Answer 1

可以使用Calendar#add方法。減去一天，如：

SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd"); 
Calendar cal = Calendar.getInstance(); 
Date date=cal.getTime(); 
System.out.println(sdf.format(date)); //remove line to display only the last 5 days 
for (int i=0;i<5;i++){ 
    cal.add(Calendar.DAY_OF_MONTH,-1); 
    date=cal.getTime(); 
    System.out.println(sdf.format(date)); 
} 

像喬恩斯基特（​​即將500K先生:)）的建議，我也發現了約達時間API更清潔和適當的，甚至對於這種簡單的任務：

DateTime dt = new DateTime();      
for (int i = 0; i < 6; i++) {      
    System.out.println(dt.toString("yyyy/MM/dd")); 
    dt = dt.minusDays(1);       
}             

Answer 2

Calendar c = Calendar.getInstance(); 
SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd"); 
System.out.println("current day : "+sdf.format(c.getTime())); 

// decrement 1 day 
c.add(Calendar.DAY_OF_MONTH, -1); 

// getTime() returns a java.util.Date 
System.out.println("the day before : "+sdf.format(c.getTime())); 

// getTimeInMillis() returns a long, which can be used to construct a java.sql.Date 
System.out.println("the day before : "+sdf.format(new java.sql.Date(c.getTimeInMillis())); 

等等......