聪聪工作室---JAVA入门小程序---首位与末位调转

package congcong;

public class frontBack{

public static void main(String[] args) {

String str=frontBack("ABC");

System.out.println(str);

}

private static String frontBack(String str) {

// TODO Auto-generated method stub

if(str.length()<1){

return str;

}else{

String mid=str.substring(1,str.length()-1);

return str.charAt(str.length()-1)+mid+str.charAt(0);

}

}

}