Java Encapsulation: Implementing Rectangle Class with Getter and Setter Methods

Java Encapsulatiion: Exercise-3 with Solution

Write a Java program to create a class called Rectangle with private instance variables length and width. Provide public getter and setter methods to access and modify these variables.

Sample Solution:

Java Code:

// Rectangle.java

// Rectangle Class
class Rectangle {
  // Declare a private double variable for length
  private double length;
  // Declare a private double variable for width
  private double width;

  // Getter method for length
  public double getLength() {
    return length;
  }

  // Setter method for length
  public void setLength(double length) {
    this.length = length;
  }

  // Getter method for width
  public double getWidth() {
    return width;
  }

  // Setter method for width
  public void setWidth(double width) {
    this.width = width;
  }
} 

// Main.java
// Main Class
public class Main {
    public static void main(String[] args) {
        // Create an instance of Rectangle
        Rectangle rectangle = new Rectangle();

        // Set values using setter methods
        rectangle.setLength(6.7);
        rectangle.setWidth(12.0);

        // Get values using getter methods
        double length = rectangle.getLength();
        double width = rectangle.getWidth();

        // Print the values
        System.out.println("Length: " + length);
        System.out.println("Width: " + width);
    }
}

Output:

Length: 6.7
Width: 12.0

Explanation:

In the above exercise,

the Rectangle class encapsulates the private instance variables length and width. The getLength() and getWidth() methods are public getter methods that allow other classes to access length and width values. The setLength() and setWidth() methods are public setter methods that allow other classes to modify length and width values.

In the Main class, an object rectangle of the Rectangle class is created. The setter methods (setLength() and setWidth()) are used to set length and width values. The getter methods (getLength() and getWidth()) are used to retrieve length and width values.

We then use System.out.println() statements to print the length and width values.

Flowchart:

Java Code Editor:

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