Thread: New to java, help with printing double

I have been messing around with java for a small while now,
i can already code with C.

Can anyone tell me however why the following wont print

double fahrenheit = 500;
double celsius = (fahrenheit - 32) * (5/9.0);
System.out.println("The value is: %5.2f",celsius);

But if i printed
double fahrenheit = 500;
double celsius = (fahrenheit - 32) * (5/9.0);
System.out.println("The value is: "+celsius);

it would just print what is stored in celsius.

I understand that celsius is a a double so why wont it print when do it the first way

/*
* This program demonstrates implicit and explicit data conversion
*/
package dataconversion;

/**
*
* @author Peggy Fisher
*/
public class DataConversion {

/**
* @param args the command line arguments
*/
public static void main(String[] args) {
// System.out.println ((3+5+8)/3);
// System.out.println ((3+5+8)/3.0);
// double volume = 4/3 * Math.PI * 10 * 10 * 10;
// double realVolume = 4/3.0 * Math.PI * 10 * 10 * 10;
//System.out.println("The volume of a sphere with a radius of 10 is: "+volume);
//System.out.println("The volume of a sphere with a radius of 10 is: "+realVolume);


double fahrenheit = 500;
double celsius = (fahrenheit - 32) * (5/9.0);
System.out.println("The value is: %5.2f",celsius);

}

}

run:
Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - Erroneous sym type: java.io.PrintStream.println
at dataconversion.DataConversion.main(DataConversion. java:26)
C:\Users\Ollie\AppData\Local\NetBeans\Cache\8.2\ex ecutor-snippets\run.xml:53: Java returned: 1
BUILD FAILED (total time: 0 seconds)

--- Update ---

i have just found out printf works
what is the difference between printf and println