Date 类如何使用？

[cshnet7]

我想实现这样的功能：
求两个给定的月/日/时/分的时间之间相隔了多少小时多少分钟，如何实现？ 谢谢！

[cshnet7]

多谢bao110908。我起初以为有现成的java方法解决。

[火龙果被占用了]

使用Date中的getTime()返回毫秒数，再根据这两个日期的毫秒数之差进行计算。

[火龙果被占用了]

PS：getTime返回的是long型数据，注意一下。

[shili150]

Date date=new Date();
s=date.getTime();

[cshnet7]

拜托给点完整代码！谢谢！！

[xiaoruozhi]

为什么不用Calendar 类呢

[cshnet7]

GregorianCalendar calendar1 = new GregorianCalendar();
GregorianCalendar calendar2 = new GregorianCalendar();

calendar1.set(2007, 7, 14, 9, 00, 00);
calendar2.set(2007, 7, 14, 18, 30, 00);

我现在要求calendar1 和 calendar2之间相隔了几小时几分钟， 请给具体代码。谢谢。

[火龙果被占用了]

import java.util.GregorianCalendar;

public class Test {
    public static void main(String[] args) {
        GregorianCalendar calendar1 = new GregorianCalendar();
        GregorianCalendar calendar2 = new GregorianCalendar();

        calendar1.set(2007, 7, 14, 9, 00, 00);
        calendar2.set(2007, 7, 14, 18, 30, 00);
        
        long t0 = calendar1.getTimeInMillis();
        long t1 = calendar2.getTimeInMillis();
        long diff = t1 - t0;

        long dateDiff = diff / (24L * 3600L * 1000L);
        diff %= 24L * 3600L * 1000L;
        long hourDiff = diff / (3600L * 1000);
        diff %= 3600L * 1000L;
        long minuteDiff = diff / (60L * 1000L);
        diff %= 60L * 1000L;
        
        System.out.printf("相差：%d天%d小时%d分%d秒",
                dateDiff,
                hourDiff,
                minuteDiff,
                diff);
    }
}

[火龙果被占用了]

上面的代码有些问题，改正一下：

import java.util.GregorianCalendar;

public class Test {
    public static void main(String[] args) {
        GregorianCalendar calendar1 = new GregorianCalendar();
        GregorianCalendar calendar2 = new GregorianCalendar();

        calendar1.set(2007, 7, 14, 9, 00, 00);
        calendar2.set(2007, 7, 14, 18, 30, 22);
        
        long t0 = calendar1.getTimeInMillis();
        long t1 = calendar2.getTimeInMillis();
        long diff = t1 - t0;

        long dateDiff = diff / (24L * 3600L * 1000L);
        diff %= 24L * 3600L * 1000L;
        long hourDiff = diff / (3600L * 1000);
        diff %= 3600L * 1000L;
        long minuteDiff = diff / (60L * 1000L);
        diff %= 60L * 1000L;
        long second = diff / 1000L;
        
        System.out.printf("相差：%d天%d小时%d分%d秒",
                dateDiff,
                hourDiff,
                minuteDiff,
                second);
    }
}