数字加密游戏-JAVA

import java.util.*;
public class new3{
public static void main(String[] ages)throws Exception{
int g,s,b,q,w,hg,hs,hb,hq;
Scanner hu = new Scanner(System.in);
System.out.print("只能输入四位数字：");
String yi = hu.next();
try{
int yu = Integer.parseInt(yi);
if(yu > 1000 && yu <=9999){
hb = g = 5 % ((yu / 1) % 10);
hq = s = 5 %((yu / 10) % 10);
hg = b = 5 %((yu / 100) % 10);
hs = q = 5 %(yu / 1000);
System.out.println("亲！您加密后的数字为："+hg+hs+hb+hq);}
else if(yu < 999){
System.out.println("数字太短，朕不受理!");}
else if(yu > 10000){
System.out.println("搞这么长这谁记得住啊？吊毛");}
else{
System.out.println("说了只能输入数字，这回服了吧？");}
}
catch(Exception e){
System.out.println("说了只能输入数字，这回服了吧？");
}
}
}