Java If Statements

In Java, the if statement is a conditional statement that allows you to execute a block of code if a certain condition is true. Here is the syntax of an if statement:

                
    if (condition) {
       // code to be executed if condition is true
    }

In the above syntax, condition is a Boolean expression that is evaluated to true or false. If condition is true, the code inside the curly braces will be executed. If condition is false, the code inside the curly braces will be skipped.

Here's an example of using if statement in Java:

                
    int age = 25;
    if (age >= 18) {
        System.out.println("You are eligible to vote.");
    }

In the above example, the if statement checks if the value of age is greater than or equal to 18. If the condition is true, the statement inside the curly braces will be executed, which in this case is printing a message saying that the person is eligible to vote.

Java if-else Statement

You can also use an else statement along with the if statement to execute a different block of code if the condition is false. Here's an example:

                
    int age = 15;
    if (age >= 18) {
        System.out.println("You are eligible to vote.");
    } else {
        System.out.println("You are not eligible to vote yet.");
    }

In this example, if the value of age is less than 18, the code inside the else block will be executed, which in this case is printing a message saying that the person is not eligible to vote yet.

Java Nested if statement

You can also use multiple 'if' statements, also known as nested 'if' statements, to check for multiple conditions. Here's an example

                
    int age = 25;
    int salary = 50000;
    if (age >= 18) {
        if (salary > 30000) {
            System.out.println("You are eligible for a loan.");
        } else {
            System.out.println("You are not eligible for a loan.");
        }
    } else {
        System.out.println("You are not eligible for a loan.");
    }

In this example, the outer 'if' statement checks if the person is of legal age, and the inner 'if' statement checks if their salary is above a certain threshold. If both conditions are true, the person is eligible for a loan.

Java if-else-if ladder Statement

In Java, the 'if-else-if' statement is a type of conditional statement that allows you to check multiple conditions in a sequence. It is called a ladder because the conditions are tested one after the other, in a sequence, similar to climbing up a ladder.

Here is the syntax of an 'if-else-if' ladder statement:

                
    if (condition1) {
       // code to be executed if condition1 is true
    } else if (condition2) {
       // code to be executed if condition1 is false and condition2 is true
    } else if (condition3) {
       // code to be executed if condition1 and condition2 are false and condition3 is true
    } else {
       // code to be executed if all conditions are false
    }

In the above syntax, the if statement tests the first condition. If the first condition is true, the code inside the corresponding block will be executed and the rest of the ladder will be skipped. If the first condition is false, the else if statement will test the second condition. If the second condition is true, the code inside the corresponding block will be executed and the rest of the ladder will be skipped. This process continues until all the conditions have been tested, or until one of the conditions is found to be true.

Here's an example of using if-else-if ladder statement in Java:

                
    int num = 10;
    if (num > 0) {
        System.out.println("The number is positive.");
    } else if (num < 0) {
        System.out.println("The number is negative.");
    } else {
        System.out.println("The number is zero.");
    }

In this example, the if-else-if ladder statement checks if the number is positive, negative, or zero. If the number is positive, the message "The number is positive." will be printed. If the number is negative, the message "The number is negative." will be printed. If the number is zero, the message "The number is zero." will be printed.

You can have as many else if statements as you need in an if-else-if ladder statement. The final else block is optional, but it is a good practice to include it to handle unexpected cases.

The if-else-if ladder statement is useful when you need to check multiple conditions and perform different actions based on those conditions. By using this statement in Java, you can create more complex and sophisticated programs that can handle various scenarios and user input.

In summary, The if statement is a fundamental tool in programming that allows you to make decisions based on certain conditions. By using if statements in Java, you can create more complex and dynamic programs that can handle different scenarios and user input.

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