Java if Keyword
Example
Test two values to find out if 20 is greater than
18. If the condition is true, print some text:
if (20 > 18) {
System.out.println("20 is greater than 18");
}
Definition and Usage
The if statement specifies a block of Java code to be executed if a condition is true.
Java has the following conditional statements:
- Use
ifto specify a block of code to be executed, if a specified condition is true - Use
elseto specify a block of code to be executed, if the same condition is false - Use
else ifto specify a new condition to test, if the first condition is false - Use
switchto specify many alternative blocks of code to be executed
More Examples
Example
Use the if statement to test variables:
int x = 20;
int y = 18;
if (x > y) {
System.out.println("x is greater than y");
}
Example
Use the else statement to specify a block of code to be executed if the condition is false.
int time = 20;
if (time < 18) {
System.out.println("Good day.");
} else {
System.out.println("Good evening.");
}
// Outputs "Good evening."
Example
Use the else if statement to specify a new condition if the first condition is false.
int time = 22;
if (time < 10) {
System.out.println("Good morning.");
} else if (time < 20) {
System.out.println("Good day.");
} else {
System.out.println("Good evening.");
}
// Outputs "Good evening."
Related Pages
Read more about conditions in our Java If...Else Tutorial.
