if / else if / else Flowchart

Workbook 1c, p.97-100 — See how Java decides which branch to run

Variable: int age =

📝 Java Codeint age = 18; // ← slider controls this
if (age >= 21) {
    System.out.println("You can drink alcohol");
} else if (age >= 18) {
    System.out.println("You can vote");
} else if (age >= 16) {
    System.out.println("You can drive");
} else {
    System.out.println("You are too young");
}

        Output:
        You can vote
      

📊 Flowchart

Variable: int temp =

°F

📝 Java Codeint temp = 72; // ← slider controls this
if (temp >= 90) {
    System.out.println("It's hot outside!");
} else if (temp >= 70) {
    System.out.println("It's warm and nice");
} else if (temp >= 50) {
    System.out.println("It's cool, grab a jacket");
} else {
    System.out.println("It's cold, stay inside!");
}

        Output:
        It's warm and nice
      

📊 Flowchart

💡 Key Concepts

Java checks conditions TOP to BOTTOM — the first true condition wins.
Once a condition is TRUE, it skips ALL remaining else-if / else blocks — only one branch ever runs.
The else block is the catch-all — it runs only if NOTHING above was true.
Order matters! If we checked age >= 16 first, a 25-year-old would match it and never reach the 21 check.

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