strReverse Calendar -1

package cn.skex.strreverse;

public class Test1 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        String strInput="abcdefg";
        String strOut=reverse(strInput);
        System.out.println(strOut);//gfedcba

    }
    
    static String reverse(String strInput){
        char[] array=strInput.toCharArray();
        char[] arrayOutput=new char[array.length];
        int i=0,j=array.length-1;
        while(j>=0){
            arrayOutput[i++]=array[j--];
        }
        return new String(arrayOutput);
    }

}

 

package cn.skex.calendar.day;

import java.util.Calendar;

public class Test1 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Calendar cal=Calendar.getInstance();
        System.out.println(cal.getTime());
        cal.add(Calendar.DATE, -1);
        System.out.println(cal.getTime());
        /*
         * Thu Jun 15 14:25:11 CST 2017
         * Wed Jun 14 14:25:11 CST 2017
         * */
    }

}