Conditional Statements

If/else statements

In Java, you can use if/else statements to control the flow of your program based on certain conditions. Here's an example:

public class IfElseExample {
    public static void main(String[] args) {
        int age = 25;

        if (age >= 18) {
            System.out.println("You are an adult.");
        } else {
            System.out.println("You are a minor.");
        }
    }
}

In the above example, we use an if/else statement to check if the age variable is greater than or equal to 18. If it is, we display the message "You are an adult." If it's not, we display the message "You are a minor."

You can also use if statements without an else statement, like this:

public class IfExample {
    public static void main(String[] args) {
        int age = 25;

        if (age >= 18) {
            System.out.println("You are an adult.");
        }

        System.out.println("Program complete.");
    }
}

In the above example, we use an if statement to check if the age variable is greater than or equal to 18. If it is, we display the message "You are an adult." Regardless of the result, we then display the message "Program complete."

Switch statements

In Java, you can use switch statements to simplify complex if/else statements. Here's an example:

public class SwitchExample {
    public static void main(String[] args) {
        int dayOfWeek = 2;

        switch (dayOfWeek) {
            case 1:
                System.out.println("Monday");
                break;
            case 2:
                System.out.println("Tuesday");
                break;
            case 3:
                System.out.println("Wednesday");
                break;
            case 4:
                System.out.println("Thursday");
                break;
            case 5:
                System.out.println("Friday");
                break;
            default:
                System.out.println("Weekend");
                break;
        }
    }
}

In the above example, we use a switch statement to check the value of the dayOfWeek variable. Depending on its value, we display the corresponding day of the week. The default case is used when none of the other cases match. The break statement is used to exit the switch statement and continue with the rest of the program.