If / Else

int score = 85;

if (score >= 90) {
    System.out.println("Grade: A");
} else if (score >= 80) {
    System.out.println("Grade: B");
} else if (score >= 70) {
    System.out.println("Grade: C");
} else {
    System.out.println("Grade: F");
}
// Output: Grade: B

Switch Statement

String day = "Monday";

switch (day) {
    case "Monday":
    case "Tuesday":
    case "Wednesday":
    case "Thursday":
    case "Friday":
        System.out.println("Weekday");
        break;
    case "Saturday":
    case "Sunday":
        System.out.println("Weekend!");
        break;
    default:
        System.out.println("Invalid day");
}

// Java 14+ Switch Expression (modern!)
String type = switch (day) {
    case "Saturday", "Sunday" -> "Weekend";
    default -> "Weekday";
};

Nested Conditions

int age = 25;
boolean hasLicense = true;

if (age >= 18) {
    if (hasLicense) {
        System.out.println("You can drive!");
    } else {
        System.out.println("Get a license first.");
    }
} else {
    System.out.println("Too young to drive.");
}

// Cleaner with &&
if (age >= 18 && hasLicense) {
    System.out.println("You can drive!");
}

✅ Quick Quiz