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Lesson 5.4: Read Blocks Beside Java-Shaped Code

Blocks and text code can express the same programming ideas. Text code uses typed words, punctuation, and braces where blocks use shapes and connections.

This block plan:

  1. Set score to 0.
  2. Repeat 3 times and change score by 2.
  3. If score >= 6, print ready.

has the same flow as this Java-shaped code:

int score = 0;

for (int count = 0; count < 3; count++) {
    score = score + 2;
}

if (score >= 6) {
    System.out.println("ready");
}

int states that score stores a whole number. Semicolons end statements. Braces group the loop and condition bodies. The variable, repeated assignment, comparison, and branch still have the same roles.

Guided practice​

Build the block version and trace score through 0, 2, 4, and 6. Point to the Java line that matches each block.

Change both versions so the loop adds 3 twice. Predict the final value and condition result. You do not need to write a full Java program yet. The goal is to recognize structure you already understand.

Loading the block workspace...

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