Random Key Generator Sample For JAVA

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package RandomKeys;

import java.util.Random;
/**
 *
 * @Author https://kat.cr/user/DickCheny/
 */
public class SteamKey {
 private static final String uCase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
 private static Random r = new Random();
 private static String pass = "";
 private static String pass1 = "";
 private static String pass2 = "";
 private static String pass3 = "";

 public static void main (String[] args) {
 System.out.println ("Generating pass...");
 while (pass.length () != 5){
 int rPick = r.nextInt(5);
 if (rPick == 0){
 int spot = r.nextInt (36);
 pass += uCase.charAt(spot);
 }
 while (pass1.length () != 5){
 int rPick1 = r.nextInt(5);
 if (rPick1 == 0){
 int spot = r.nextInt (36);
 pass1 += uCase.charAt(spot);
 }
 while (pass2.length () != 5){
 int rPick2 = r.nextInt(5);
 if (rPick2 == 0){
 int spot = r.nextInt (36);
 pass2 += uCase.charAt(spot);
 }
 while (pass3.length () != 5){
 int rPick3 = r.nextInt(5);
 if (rPick3 == 0){
 int spot = r.nextInt (36);
 pass3 += uCase.charAt(spot);
 }
 }
 }
 }
 }
 System.out.println ("Generated Pass: " + pass + "-" + pass1 + "-" + pass2 + "-" + pass3);
 
}
}