A switch statement is a conditional statement that tests against multiple cases and displays one or multiple outputs based on the matching circumstances. Unlike if-then and if-then-else statements, the switch statement can work with byte, short, char, and int primitive data types. It also works with enum types (discussed in Java Enum), the String class, and a few wrapper classes: Character, Byte, Short, and Integer. Important Rules Only constants or literals are allowed in case Duplicate …

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Java is a statically-typed language, which means that all variables must first be declared before they can be used. It means the variable’s name and types must be defined before it can be used in code. boolean bool = true; By writing the above line we are telling the program that a variable named bool …

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In this article, we will talk about the method parameter and method argument. Please make a note that the method argument and method parameter are sometimes used interchangeably. Parameters refer to the list of variables in a method declaration. Arguments are the actual values that are passed in when the method is invoked. When you invoke a method, the …

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Introduction to functional interfaces A functional interface is an interface that has a single abstract method.  Functional interfaces can have multiple static and default methods, but they should have only one abstract method to qualify as a functional interface. Functional interfaces were introduced in Java 8 in order to implement lambda expressions.