pepper:PGM-2016 [17:42:27] $ java -version && echo 'class Test { public static void main(String...args) {String s = args[0]; for(int i = 0; i < s.length()  % 3; i++) s = "0" + s; System.out.println(s); } }' > Test.java && javac Test.java && javap -c Test
java version "1.8.0_66"
Java(TM) SE Runtime Environment (build 1.8.0_66-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.66-b17, mixed mode)
Compiled from "Test.java"
class Test {
  Test();
    Code:
       0: aload_0
       1: invokespecial #1                  // Method java/lang/Object."<init>":()V
       4: return

  public static void main(java.lang.String...);
    Code:
       0: aload_0
       1: iconst_0
       2: aaload
       3: astore_1
       4: iconst_0
       5: istore_2
       6: iload_2
       7: aload_1
       8: invokevirtual #2                  // Method java/lang/String.length:()I
      11: iconst_3
      12: irem
      13: if_icmpge     42
      16: new           #3                  // class java/lang/StringBuilder
      19: dup
      20: invokespecial #4                  // Method java/lang/StringBuilder."<init>":()V
      23: ldc           #5                  // String 0
      25: invokevirtual #6                  // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
      28: aload_1
      29: invokevirtual #6                  // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
      32: invokevirtual #7                  // Method java/lang/StringBuilder.toString:()Ljava/lang/String;
      35: astore_1
      36: iinc          2, 1
      39: goto          6
      42: getstatic     #8                  // Field java/lang/System.out:Ljava/io/PrintStream;
      45: aload_1
      46: invokevirtual #9                  // Method java/io/PrintStream.println:(Ljava/lang/String;)V
      49: return
}