public enum DaysOfweek
{
    SUNDAY,MONDAY.....
}

public final class MyClass {
    private MyClass() { }
}

public final class MyClass {
    public static string MY_STRING;
    public static int MY_INT;

    private MyClass() {}
}

public final class MyClass {

    private MyClass() {
        // Private so noone else can instantiate this
    }

}

public final class A {
    public static final int YOUR_CONST = 5;

}

public final class A {
    public static final int YOUR_CONST = 5;

    private A() {}

}

public final class Trial // it is the FINAL
{
    private static final int CONSTANT_VALUE = 666;

    private Trial() // it is PRIVATE instead of PUBLIC
    {
    }

    public static int getConstantValue()
    {
       return CONSTANT_VALUE;
    }
}

public class Bully //extends Trial ////"extends" WILL NOT COMPILE
{
    public static void main(String[] args)
    {
        //Trial trial = new Trial(); ////"new Trial()" WILL NOT COMPILE

        // The only thing can be done is getting a constant value from "Trial"
        int acquiredValue = Trial.getConstantValue();
        System.out.println(acquiredValue);
    }
}