Summary - Conditionals

Combine if, else if, switch and ternary to write a day-of-week app.

Summary - Conditionals

In this group you learned conditionals:

if: single condition
else/else if: alternative branches
nested if: multiple conditions together
switch: multi-branch (case/break/default)
ternary: one-line condition

These structures let the program make decisions. Now combine them and write a day-of-week app.

Exercise Day name (switch)

Write a Main class with a main method. Assign 3 to int day. With switch (day) print "Monday" for case 1:, "Tuesday" for case 2:, "Wednesday" for case 3:. Add break; after each case.

Show example solution

public class Main {
    public static void main(String[] args) {
        int day = 3;
        switch (day) {
            case 1:
                System.out.println("Monday");
                break;
            case 2:
                System.out.println("Tuesday");
                break;
            case 3:
                System.out.println("Wednesday");
                break;
        }
    }
}

Exercise Greeting (if/else if/else)

Write a Main class with a main method. Assign 14 to int hour. With if (hour < 12) print "Good morning", else if (hour < 18) print "Good day", else print "Good evening".

Show example solution

public class Main {
    public static void main(String[] args) {
        int hour = 14;
        if (hour < 12) {
            System.out.println("Good morning");
        } else if (hour < 18) {
            System.out.println("Good day");
        } else {
            System.out.println("Good evening");
        }
    }
}

Test yourself

Which structure best picks a branch by specific values?
- while
- switch
- for
- Scanner
Show answer

switch — switch branches by specific values.
Match the conditional structures

if

Condition
switch

Multi-branch
?

Ternary
else

Fallback

Complete the ternary

int x = 10;
String s = (x > 0) ? "Positive" : ____;

Show answer

int x = 10;
String s = (x > 0) ? "Positive" : "Negative";

Next lesson: The for loop

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