In Java, if-else is a control flow statement used to execute certain blocks of code based on whether a condition is true or false.

Syntax: 

if (condition) {
    // Code to execute if condition is true
} else {
    // Code to execute if condition is false
}

Example: 

int number = 10;

if (number > 0) {
    System.out.println("The number is positive.");
} else {
    System.out.println("The number is not positive.");
}

How it works:

  • The condition inside the if statement is evaluated.
  • If it's true, the code block inside the if is executed.
  • If it's false, the code block inside the else is executed.

Let me know if you want to go over else-if or nested if too!