To use the “Math.min()” method in Java. Pass two values from which the minimum value needs to be found as an argument for the Math.min() method.

The size() method finds the size/length of a list, this method is applied directly to the list and it returns the number of elements residing in that list.

To Use the “Character.isDigit()” Method, pass the “char” variable or ASCII values as an argument to check if the character is a digit or not.

To sort a String in Java, use the “sort()” method with default and custom parameters, “Java 8 Streams API”, “reverseOrder()”, or define a custom method.

To reverse a list in Java, use the “Collections.reverse()” or “add() and remove()” methods or Recursion, ListIterator, Iteration, and Stream API approaches.

To return an array in Java, use the “return” keyword before the array name after the array declaration and initialization and use the “for” loop to select the array elements.

To check if a file or directory exists in Java, use the “exists()” method provided by two utilities “java.nio.file.Files” or “java.io.File”.

The “char” keyword is a primitive datatype in Java used to store a single character within the single quotes i.e., ‘a’, ‘A’ etc. Its default size is 2 bytes.