The if statement
- Java course
- Beginner
- Lesson 36/116
- 4 min
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.
Practice 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").
Sample solution
public class Main {
public static void main(String[] args) {
int temp = 32;
if (temp > 30) {
System.out.println("Hot");
}
}
}Expected output
Hot
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 When does if (score >= 50) return true?
- When score is below 50
- When score is 50 or above Correct answer
- Always
- When score is 0
Explanation: >= includes 50 and above.
2 Complete the if condition
int score = 75;
if (score ____ 50) {
System.out.println("Pass");
}int score = 75;
if (score >= 50) {
System.out.println("Pass");
}Explanation: Use >= for greater-or-equal.
3 Match the if concepts
| Term | Meaning |
|---|---|
if |
Condition |
( ) |
Parens |
{ } |
Block |
true |
Runs |