How to declare a constant in Java

/**
 * @author lautturi.com
 * Java example: using final keyword to declare a constant in Java
 */

import java.util.*;

public class Lautturi {

	public static void main(String[] args) {

		final double PI = 3.14159;
		System.out.println(PI);
		PI = 3.14; // we could not modify the value of a final variable
		
		// Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
	//The final local variable PI cannot be assigned. It must be blank and not using a compound assignment
	
	}
}