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I think generally to invoke the overloaded method we pass the type of argument to it.

here also if we pass string as argument it will invoke the first main method and if we pass int value as...

java programming langauge can distinguish methods with different method signature.

Two components of method declaration comprise of method signature ie. Method name and parameter list..
That is...

The observable class is used to create subclasses that other parts of your program can observe.

When an object of such a subclass undergoes a change, observing classes are notified.
obeserving...