Nested if Statements

In Java, you can use nested if statements to create a structure where one if statement is placed inside another. This allows you to check multiple conditions in a hierarchical manner. Each inner if statement is executed based on the result of its outer if statement.

Example:

public class NestedIfStatementExample {
    public static void main(String[] args) {
        int x = 10;
        int y = 5;

        if (x > 0) {
            System.out.println("x is positive");

            if (y > 0) {
                System.out.println("y is positive");
            } else {
                System.out.println("y is non-positive");
            }

        } else {
            System.out.println("x is non-positive");
        }
    }
}

In this example:

• The outer if statement checks if x is positive.
• If x is positive, the inner if statement checks if y is positive.
• Depending on the conditions, different messages are printed.

It's important to properly indent the code to maintain clarity. Nested if statements can be used to handle more complex decision-making scenarios. However, it's essential to be mindful of code readability to avoid confusion.

if (condition1) {
    if (condition2) {
        // Code for condition1 and condition2
    } else {
        // Code for condition1 and not condition2
    }
} else {
    // Code for not condition1
}

Keep in mind that excessive nesting can lead to code that is hard to read and maintain. In some cases, refactoring the code using logical operators (&&, ||) or introducing separate methods may improve readability.