Public class Encpryt {

Public encryption () {

Scanner scan = new scanner (system. in);

System.out.println ("Enter four digits:");

string str = scan . next()；

while(str！ = "q"){

if (str.length()！ =4) {

System.out.println ("The number you entered is not 4 digits, please re-enter");

str = scan . next()；

Continue;

}

System.out.println ("encryption number is:");

char[]ns = new char[4]；

for(int I = 0； I<4; i++){

ns[I]= str . charat(I)；

system . out . println(ns[I]-' 0 '+' a '- 1)；

}

System.out.println ("Enter four digits:");

str = scan . next()；

}

}

/* * * * @ param args

*/

Public static void main(String[] args) {

new Encpryt()；

}

}