Lesson 3 of 9

Conditions and switch

JAVA · inside main

int score = 85;
if (score >= 90) {
    System.out.println("A");
} else if (score >= 80) {
    System.out.println("B");
} else {
    System.out.println("C");
}

Output

The condition goes in ( ) and the code in { }. Java's logical operators are && (and), || (or) and ! (not).

JAVA · inside main

String dept = "IT";
switch (dept) {
    case "IT" -> System.out.println("Floor 3");
    case "HR" -> System.out.println("Floor 1");
    default -> System.out.println("Ask reception");
}

Output

Floor 3

Watch outCompare strings with .equals(), not ==. == checks whether they are the same object in memory, not whether the text matches.

JAVA · inside main

String a = "MIS";
String b = new String("MIS");
System.out.println(a == b);
System.out.println(a.equals(b));

Output

false
true

Same idea in both languages

Python

if score >= 90:
    print("A")
elif score >= 80:
    print("B")

Java

if (score >= 90) {
    System.out.println("A");
} else if (score >= 80) {
    System.out.println("B");
}