java how to convert int to string

/**
 * @author lautturi.com 
 * Java example: java convert integer to string
 */
import java.util.*;

public class Lautturi {
    
	public static void main(String[] args) {

		int num = 1234;

		// method 1
		String s1=String.valueOf(num);

		// method 2
		String s2=Integer.toString(num);

		// method 3
		String s3=String.format("%d",num);

	}
}