In this tutorial, we will learn about if-else statements in Java. We will cover the basics of conditional execution using if-else statements.
An if-else statement is a conditional statement that executes one block of code if a specified condition is true, and another block of code if the condition is false.
The syntax for the if-else statement in Java is:
if (condition) {
// Code block to execute if condition is true
} else {
// Code block to execute if condition is false
}
The if-else statement evaluates the specified condition. If the condition is true, the code block inside the if statement is executed; otherwise, the code block inside the else statement is executed.
num
.num
.num
is even or odd.num
is even or odd.public class Main {
public static void main(String[] args) {
int num = 10;
if (num % 2 == 0) {
System.out.printf("%d is even.%n", num);
} else {
System.out.printf("%d is odd.%n", num);
}
}
}
10 is even.
str
.str
.str
starts with a specific value.public class Main {
public static void main(String[] args) {
String str = "Hello, world!";
if (str.startsWith("Hello")) {
System.out.println("String starts with 'Hello'.");
} else {
System.out.println("String does not start with 'Hello'.");
}
}
}
String starts with 'Hello'.
num
.num
.num
is positive or negative.num
is positive or negative.public class Main {
public static void main(String[] args) {
int num = -5;
if (num > 0) {
System.out.printf("%d is positive.%n", num);
} else {
System.out.printf("%d is negative or zero.%n", num);
}
}
}
-5 is negative or zero.