WAP to Left shifting as a quick way to multiply by 2

/*WAP to Left shifting as a quick way to multiply by 2.
Save As: MultByTwo.java
*/

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);
}
}
}