java boolean assignment in if condition

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In programming, we use the if..else statement to run a block of code among more than one alternatives.

For example, assigning grades (A, B, C) based on the percentage obtained by a student.

if the percentage is above 90 , assign grade A
if the percentage is above 75 , assign grade B
if the percentage is above 65 , assign grade C

1. Java if (if-then) Statement

The syntax of an if-then statement is:

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

if condition evaluates to true , the lines of code inside if are executed
if condition evaluates to false , the lines of code inside if are skipped

Working of if Statement

if the number is greater than 0, code inside if block is executed, otherwise code inside if block is skipped

Example 1: Java if Statement

In the program, number < 0 is false . Hence, the code inside the body of the if statement is skipped .

Note: If you want to learn more about about test conditions, visit Java Relational Operators and Java Logical Operators .

We can also use Java Strings as the test condition.

Example 2: Java if with String

In the above example, we are comparing two strings in the if block.

2. Java if...else (if-then-else) Statement

The if statement executes a certain section of code if the test expression is evaluated to true . However, if the test expression is evaluated to false , it does nothing.

In this case, we can use an optional else block. Statements inside the body of else block are executed if the test expression is evaluated to false . This is known as the if-...else statement in Java.

The syntax of the if...else statement is:

Here, the program will do one task (codes inside if block) if the condition is true and another task (codes inside else block) if the condition is false .

How the if...else statement works?

If the condition is true, the code inside the if block is executed, otherwise, code inside the else block is executed

Example 3: Java if...else Statement

In the above example, we have a variable named number . Here, the test expression number > 0 checks if number is greater than 0.

Since the value of the number is 10 , the test expression evaluates to true . Hence code inside the body of if is executed.

Now, change the value of the number to a negative integer. Let's say -5 .

If we run the program with the new value of number , the output will be:

Here, the value of number is -5 . So the test expression evaluates to false . Hence code inside the body of else is executed.

3. Java if...else...if Statement

In Java, we have an if...else...if ladder, that can be used to execute one block of code among multiple other blocks.

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.

How the if...else...if ladder works?

If the first test condition if true, code inside first if block is executed, if the second condition is true, block inside second if is executed, and if all conditions are false, the else block is executed

Example 4: Java if...else...if Statement

In the above example, we are checking whether number is positive, negative, or zero . Here, we have two condition expressions:

number > 0 - checks if number is greater than 0
number < 0 - checks if number is less than 0

Here, the value of number is 0 . So both the conditions evaluate to false . Hence the statement inside the body of else is executed.

Note : Java provides a special operator called ternary operator , which is a kind of shorthand notation of if...else...if statement. To learn about the ternary operator, visit Java Ternary Operator .