Calendar 类

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import java.util.*;import java.text.*;class Demo {public static void main(String[] args) {Calendar c = Calendar.getInstance();Scanner sc = new Scanner(System.in);int x = 0;while(sc.hasNextInt()){x = sc.nextInt();}c.set(x,2,1);c.add(Calendar.DAY_OF_MONTH,-1);System.out.println(c.get(Calendar.DAY_OF_MONTH));//获取某年2月的天数Calendar c1 = Calendar.getInstance();c1.add(Calendar.DAY_OF_MONTH,-1);//获取昨天此刻System.out.println(c1.get(Calendar.HOUR_OF_DAY)+":"+c1.get(Calendar.MINUTE)+":"+c1.get(Calendar.SECOND));}}