Java字符串补0

Question

我查出的字符传都是不大于4位的，
如："1","12","123","1234"，
我想得到"0001","0012","0123","1234"
如何写程序？

Answer 1

自己写个right方法.
public class Test{ public static void main(String[] args){
String s1="1";
String s2="12";
String s3="123";
String s4="1234";
System.out.println(right("0000"+s1,4));
System.out.println(right("0000"+s2,4));
System.out.println(right("0000"+s3,4));
System.out.println(right("0000"+s4,4)); } public static String right(String s,int pos){
        String dido=new StringBuffer(s).reverse().substring(0,pos);
        StringBuffer sb=new StringBuffer(dido).reverse();
         String didoleo=new String(sb);
        return didoleo; }
}