Loops in Java

Loops are used for repeated execution of a block. What are loops? Loops are used for repeated execution of a block. There are following types of loops in Java: while Loop do…while loop for loop

While Loop Syntax: while (Boolean Expression) { //your code } e.g. Example_while.java

Do...while Loop Syntax: do { //your code }while(Boolean_expression); e.g. Example_dowhile.java

For Loop Syntax: for(initialization; Boolean_expression; update) { //Statements } Initialization: The first step in execution for initializing your loop variable. Boolean_expression: Condition for evaluation. If evaluated to true, loop executes, else goes to the next statement. Update: After the body of the for loop executes, the flow of control jumps back up to the update statement. This statement allows you to update any loop control variables. The code block is re-executed till the time the Boolean expression evaluates to true. Example: Example_for.java

Enhanced for loop in Java: Typically used for arrays. Syntax: for(declaration : expression) { //your code } Example: Example_efor.java

Break & Continue Break: for breaking out of the loop immediately and execute what's after the block. Continue: it causes the flow of control to jump to the next iteration. Syntax: break; // for break continue; //for continue Example: Example_break_continue.java

Methods

What is it all about? A Java method is a collection of statements that are grouped together to perform an operation. Syntax: modifier returnValueType methodName(list of parameters) { // Method body; } Example: Example_method.java

Constructors A constructor is used for initializing an object. It has the same name as the class. It looks similar to a method. It does not have a return type. Example: Example_constructor.java Example_cons_invkd.java