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 {
  private double length;
  private double width;

  public double getLength() {
    return length;
  }

  public void setLength(double length) {
    this.length = length;
  }

  public double getWidth() {
    return 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);
  }
}

Sample 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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