Display number from 0-9 in two digits

Approach 1: Just append 0 to the number.

private static void printNumberInTwoDigits_1(int num) {

         System.out.println("0" + num);

}

Approach 2: Using String.format

private static void printNumberInTwoDigits_2(int num) {

         String result = String.format("%02d", num);

         System.out.println(result);

}

Approach 3: Using System.out.printf.

private static void printNumberInTwoDigits_3(int num) {

         System.out.printf("%02d\n", num);

}

Find the below working application.

App.java

package com.sample.app;

public class App {

	private static void printNumberInTwoDigits_1(int num) {
		System.out.println("0" + num);
	}

	private static void printNumberInTwoDigits_2(int num) {
		String result = String.format("%02d", num);
		System.out.println(result);
	}

	private static void printNumberInTwoDigits_3(int num) {
		System.out.printf("%02d\n", num);
	}

	public static void main(String args[]) {

		printNumberInTwoDigits_1(9);
		printNumberInTwoDigits_2(9);
		printNumberInTwoDigits_3(9);
	}
}

Output

09

09

09

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