If-Else Statements

The if statement is a decision statement.

Example 1. Syntax of the Basic if Statement

if (booleanExpression) {
     System.out.println("In the if block");
}

Example 2. Syntax of the Basic if-else Statement

if (booleanExpression) {
    System.out.println("Inside if block");
} else {
    System.out.println("Inside else block");
}

Rules of the if-else statement in java:

• The only legal expression in an if statement is an expression that resolves to a boolean or a Boolean variable.
• Curly braces are optional for if blocks that have only one conditional statement.
• It is possible to have zero or one else for a given if, and it must come after any else ifs.
• It is possible to have zero to many else ifs for a given if, and they must come before the (optional) else.
• Once an else if succeeds, none of the remaining else ifs or else's will be tested.