Java convert any integer to 4 digits

Question

This seems like an easy question. One of my assignments basically sends a time in military format (like 1200, 2200, etc) to my class.

How can I force the integer to be converted to 4 digits when it's received by my class? For example if the time being sent is 300, it should be converted to 0300.

EDIT: it turns out i didnt need this for my problem as i just had to compare the values. Thanks

Answer 1

As simple as that:

String.format("%04d", 300) 

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For comparing hours before minutes:

int time1 =  350; int time2 = 1210; // int hour1 = time1 / 100; int hour2 = time2 / 100; int comparationResult = Integer.compare(hour1, hour2); if (comparationResult == 0) {     int min1 = time1 % 100;     int min2 = time2 % 100;     comparationResult = Integer.compare(min1, min2); } 

Note:

Integer.compare(i1, i2) has been added in Java 1.7, for previous version you can either use Integer.valueOf(i1).compareTo(i2) or

int comparationResult; if (i1 > i2) {     comparationResult = 1; } else if (i1 == i2) {     comparationResult = 0; } else {     comparationResult = -1; } 

Answer 2

 String a = String.format("%04d", 31200).substring(0, 4); /**Output: 3120 */  System.out.println(a);   String b = String.format("%04d", 8).substring(0, 4); /**Output: 0008 */ System.out.println(b);