Java user defined or custom exception

Java user defined or custom exception example

Example of user defined exception or custom exception in Java : In java, we have different types of exceptions already available. For example, NullPointerException, ArrayIndexOutOfBoundException , ClassNotFoundException , FileNotFoundException etc. All of these exceptions invokes for specific predefine rules. For example, NullPointerException occurs if we try to do any operation Read more…

Java empty an Arraylist with example

Java Example to empty an Arraylist

Empty an arraylist in Java using clear() and removeAll() : To remove all elements from an ArrayList in Java, we have two inbuilt methods : clear() and removeAll(). Both methods can remove all elements from an ArrayList. Both method looks same but there is a difference between them. Even both Read more…