The if statement

Learn condition checks with if.

The if statement

The if statement runs a block when a condition is true. The condition is written in parentheses and must evaluate to a boolean.

int score = 75;
if (score >= 50) {
    System.out.println("Pass");
}

If the condition is true, the code inside the braces runs; if false, it is skipped. Comparison operators are >, <, >=, <=, == and !=. Braces are optional for one-line blocks but recommended for readability.

Block and comparison

An if block is delimited by braces. The condition uses comparison operators:

int age = 20;
if (age >= 18) {
    System.out.println("Can drive");
}

Operators: > greater, < less, >= greater or equal, <= less or equal, == equal, != not equal. Conditions can be combined with logical operators: && and, || or.

Exercise Temperature check with if

Write a Main class with a main method. Assign 32 to int temp. Inside if (temp > 30) print System.out.println("Hot").

Show example solution

public class Main {
    public static void main(String[] args) {
        int temp = 32;
        if (temp > 30) {
            System.out.println("Hot");
        }
    }
}

Test yourself

When does if (score >= 50) return true?
- When score is below 50
- When score is 50 or above
- Always
- When score is 0
Show answer

When score is 50 or above — >= includes 50 and above.

Complete the if condition

int score = 75;
if (score ____ 50) {
    System.out.println("Pass");
}

Show answer

int score = 75;
if (score >= 50) {
    System.out.println("Pass");
}

Match the if concepts

if

Condition
( )

Parens
{ }

Block
true

Runs

Next lesson: else and else if

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