Increment “++” is one of the unary operators in Java that increments the variable value by one. It is used either as a pre-increment “++i” or post-increment “i++”.

Create a recursive function that takes a number and multiplies it with its preceding numbers recursively until the base condition is fulfilled.

To compare enum members in Java, the “==” operator, the “equals()” method and the “compareTo()” method are used. Each method has its own pros and cons.

To comment multiple lines in Java, wrap your code to be commented within the “/* */” symbol.
Alternatively, you can use the keyboard shortcut key “CTRL + /”.

To check variable type in Java, use the “isInstance()” method, instanceof operator, “getClass().getName()” method, or “getClass().getSimpleName()”.

To check palindrome strings in Java, use the “StringBuffer” class, “for loop”, “recursion”, or “two pointer variables” method.

To use the “Stack.peek()” method in Java, simply call it on the targeted stack via the dot syntax, i.e., “stackName.peek()”.

To use PI in Java, call the predefined PI constant of the “java.lang.Math” class. It is a static constant that is called/used directly with the class name.