Java convert int to double with 2 decimal places

/**
 * @author lautturi.com
 * Java example: round double number in java
 */

import java.util.*;
import java.text.DecimalFormat;

public class Lautturi {

	public static void main(String[] args) {

		double PI = 3.1415926;
		DecimalFormat df = new DecimalFormat("#.00");
		String piStr = df.format(PI);
		System.out.println(piStr); 
		
	}
}

output:

3.14