Java if...else

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Index

1. Java if Statement
2. Java if…else Statement
3. Java if…else…if Statement
4. [[#java-short-hand-ifelse-statement|Java short hand if...else statement]]

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Java if Statement

The syntax of an if-then statement is:

if (condition) {
  // statements
}

Here, condition is a boolean expression such as age >= 18.

• if condition evaluates to true, statements are executed
• if condition evaluates to false, statements are skipped

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Java if…else Statement

Statements inside the body of else block are executed if the test expression is evaluated to false.

if (condition) {
  // codes in if block
}
else {
  // codes in else block
}

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Java if…else…if Statement

if…else…if can be used to execute one block of code among multiple other blocks.

if (condition1) {
  // codes
}
else if(condition2) {
  // codes
}
else if (condition3) {
  // codes
}
.
.
else {
  // codes
}

Here, if statements are executed from the top towards the bottom. When the test condition is true, codes inside the body of that if block is executed. And, program control jumps outside the if…else…if ladder.

If all test expressions are false, codes inside the body of else are executed.

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Java short hand if...else statement

There is also a short-hand if else, which is known as the ternary operator because it consists of three operands.

It can be used to replace multiple lines of code with a single line, and is most often used to replace simple if else statements:

Syntax:

variable = (condition) ? expressionTrue :  expressionFalse;

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