To Demonstrate that Left shifting as a quick way to multiply by 2

Here is a Java Program to Demonstrate that Left shifting as a quick way to multiply by 2

class MultByTwo {
  public static void main(String args[]) {
    int i;
    int num = 0xFFFFFFE;

    for(i=0; i<4; i++) {
      num = num << 1;
      System.out.println(num);
    }
  }
}

Output of Above Java Program
536870908
1073741816
2147483632
-32