last minute java

Java Enumeration or Enum is nothing but a Class with a List of Constants, Constructors, Instance Variables and Instance Methods. Enum is like a custom data type.

An array is a collection of elements of same data type Primitive or Object type. Each element has a position number called an Index. The size of an array is simply the number of elements of that array. Let us learn Java arrays and multidimensional arrays in detail.

A CONTINUE statement inside a loop or iteration in Java causes the program control to go to the beginning of the loop. Next iteration of the loop continues as usual. A CONTINUE statement can be used only with Loops. If you use, you get the error "continue cannot be used outside of a loop".

There are two types of CONTINUE statements.

A BREAK statement in Java causes the program control to exit the block or loop immediately.

Java Label

A Java Label is any valid Identifier or name with a COLON after it.

Rules to define a Label

1. A Label name must start with either Alphabet, Underscore(_) or a Dollar ($) symbol. It may contain numbers.
2. A Label must be followed by a Loop or a Block.
3. Defining a Label like a Goto statement produces a compiler error

There are two types of Break statements.

Another variation of the traditional FOR loop is an Enhanced FOR loop. It is also called a FOR-EACH loop. It is completely different from the traditional WHILE, DO WHILE and FOR loops which were adopted from the C Programming Language.

Java language provides another good looping control statement called FOR loop. A FOR loop is superior to WHILE loop and DO WHILE loop in terms of flexibility in maintaining loop variables.

Java FOR Loop Explained

There are two types of FOR loops.

Java language provides a Do While loop with slightly modified features of the WHILE loop.

Normal WHILE loop does not execute loop statements if the condition is not satisfied or true. But a DO WHILE loop executes the loop statements for the first time without even checking the loop condition. Programmers usually prefer a WHILE loop to DO WHILE loop.

As part of Loop control statements, Java provides three loops namely WHILE loop, FOR loop and DO WHILE loop. Loops repeatedly execute a set of statements as long as the Loop condition is satisfied. A while loop executes the statements under it only if the condition is satisfied.

Java language provides an alternative to the IF ELSE-IF ladder in the form of SWITCH CASE.

Java Switch case uses the following predefined keywords.

A Control statement in Java decides the code to be executed based on a condition. All control statements take the boolean value as an INPUT and branches control accordingly. Usually, the true condition takes control to one branch of code and the false condition takes control to another branch.