Java Programming Chapter 5 (If Statement)

In this chapter I will explain about If statement, OK check this code :
The if statement has this form, where condition is true or false.

... // Do these statements before.
if (condition) {
    ... // Do this clause if the condition is true.
}
... // Do these statements after.

or

... // Do these statements before.
if (condition) {
    ... // Do this clause if the condition is true
} else {
    ... // Do this clause if the condition is false
}
... // Do these statements after.

Example - EvaluateScore.java 
This displays one of two messages, depending on an input value.

// Description: Evaluate a test score.  Illustrates if statement.
// File  : if/EvalScore.java
// Author: Fred Swartz - 2007-04-09 - Placed in public domain.

import javax.swing.*;

public class EvalScore {
    public static void main(String[] args) {//... Input a score.
        String scoreStr = JOptionPane.showInputDialog(null, "Enter your score?");
        int score = Integer.parseInt(scoreStr);
        
        //... Create a message.
        String comment;   // Message to the user.
        if (score >= 60) {
            comment = "Not so bad";
        } else {
            comment = "This is terrible";
        }
        
        //... Output the message.
        JOptionPane.showMessageDialog(null, comment);
    }
}

Flowchart If Statement