/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.text.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		double value = 0.5;
		// String concatenation 
		DecimalFormat df = new DecimalFormat("0.000");
    	System.out.println("value: " + df.format(value));
 
		// printf
		System.out.printf("value: %.3f", value);
	}
}

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