Glen Fernandes

Hello Amit,

It means that the only place you can use the operator/keyword new to instantiate an object of the class (with a private constructor) is in a method inside that class.

However it can't be a non-static method, since that requires an object that is already instantiated with new. So a static method is needed to return a constructed object.

If a code example helps:
class SomeClass { private SomeClass() { // constructor } public static SomeClass create() { return new SomeClass(); } }

You can read up on the Singleton design pattern which relates to this.

Regards,
Glen

Hi Sajid,

Entry is static nested interface, inside interface Map.
This is almost like a static-nested class inside a class.

Consider the following code:
interface Outer { static abstract interface Inner { public abstract void method(); } }

You can reference this via Outer.Inner, and even instantiate an object of an anonymous inner class, for example:
Outer.Inner o = new Outer.Inner() { public void method() { // implementation } };

Simply put, a static nested interface behaves similarly to a static nested class - except it is an interface. (Technically it is not an "inner"-interface, just as static nested classes are not "inner"-classes).

Regards,
Glen

Hi,

Quite simply, it's an operator precedence issue.
Operator == has the lowest precedence in that expression.

What you want instead is:
System.out.println((s.equals(s1)) + " " + (s == s1));

Otherwise the s.equals(s1)+" "+s is evaluated, yielding a new String with the value "true ". This is then compared to s1 with the == operator, which obviously yields false.

Regards,
Glen

[ April 16, 2005: Message edited by: Glen Fernandes ]
[ April 17, 2005: Message edited by: Glen Fernandes ]

Hey,

Think of Math.round(x) as being equivalent to a Math.floor(x + 0.5)
So Math.round(-2.9) would equal Math.floor(-2.4)

And you should know that the floor method will return the largest integer which is less than or equal to its argument (so in this case -3).

Regards,
Glen

Hiya,

Just sat and passed the SCJP 1.4 exam today morning: scored 96%.
Next up, SCJD!

Regards,
Glen