Java if- else Statement

In Java, the if statement is a control structure that allows you to execute a block of code conditionally, based on the value of a boolean expression. The if statement has the following syntax:

if (boolean-expression) {
  // code to be executed if boolean-expression is true
}

You can also use the else clause to specify an alternative block of code to be executed if the boolean expression is false. The else clause has the following syntax:

if (boolean-expression) {
  // code to be executed if boolean-expression is true
} else {
  // code to be executed if boolean-expression is false
}

Here is an example of an if statement in Java:

int x = 5;
if (x > 0) {
  System.out.println("x is positive");
}

Output:

x is positive

In this example, the if statement checks if the value of x is greater than 0. Since x is indeed greater than 0, the code inside the if block is executed and the message "x is positive" is printed to the console.

You can also use the else clause to specify an alternative block of code to be executed if the boolean expression is false. For example:

int x = -5;
if (x > 0) {
  System.out.println("x is positive");
} else {
  System.out.println("x is not positive");
}

Output:

x is not positive

In this example, the value of x is negative, so the code inside the else block is executed and the message "x is not positive" is printed to the console.

The if statement is a powerful control structure that allows you to write code that can adapt to different conditions and execute different blocks of code depending on the values of variables and other expressions.

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