What is IllegalStateException. How to resolve IllegalStateException. Example IllegalstateException.

What is IllegalStateException.
How to resolve IllegalStateException.
Example for IllegalstateException.
IllegalStateException:

When we try to call a method at illegal or at inappropriate time then this exception is generated.
It means that a method has been invoked at the wrong time.

The IllegalStateException is also thrown when the Java environment or application is not in an appropriate state for the requested operation.
• If we try to add elements a queue which is already full then in such case IllegalStateException will get generated.

• If we try Calling iterator's remove() method before next() method.

• If we try to start the same thread once again .
Demo examples present in the video lecture.

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