Help please!!

[Nancy Bradley]

This program is suppose to calculate area and perimeter of a rectangle and an applet to test it.
When I run the program I can input the length and width, but the computer does not do any calculations
I can not figure it out
Thank you for your help and time
Nancy B

[Nancy Bradley]

Sorry I forgot to type the code.
This is the Rectangle class

// 3-24-04
// create a class rectangle and an applet to test created class

public class Rectangle extends Object
{
  private float perimeter;
  private float area;
  float mainX, mainY;
 
  // constructor
  public Rectangle()
  {
  }
 
  public void setLength(float x)                 // set length
  {
    x = ((x >= 1 & x < 20) ? x : 1);                  // range validation
  }
 
  public void setWidth(float y)                  // set width
  {
    y = ((y >= 1 & y < 20) ? y : 1);                // range validation
  }
 
  public float getLength()                        // get length
  {
    return mainX;
  }
 
  public float getWidth()                         // get width
  {
    return mainY;
  }
 
  public float getPerimeter()                     // calculates perimeter
  {
    return perimeter = (2 * mainX) + (2 * mainY);
  }
 
  public float getArea()                          // calculates area
  {
    return area = (mainX * mainY);
  }
}

and here is the applet

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
import Rectangle;
 
public class Rectangle1 extends JApplet implements ActionListener
{
  // field's labels
  private JLabel lengthLabel, widthLabel, outputLabel;               
  // number enter by user
  private JTextField lengthField, widthField, outputField;            
  // height and width variables
  private float x, y;                                                 
  private Rectangle rect;
 
  public void init()
  {
    // calls Rectangle constructor
    rect = new Rectangle();                                        
    Container c = getContentPane();
    c.setLayout(new FlowLayout());
    // set up length label and length field
    lengthLabel = new JLabel("Length");
    lengthField = new JTextField(10);
    lengthField.addActionListener(this);
    c.add(lengthLabel);
    c.add(lengthField);
    // set up width label and width field
    widthLabel = new JLabel("Width");
    widthField = new JTextField(10);
    widthField.addActionListener(this);
    c.add(widthLabel);
    c.add(widthField);
    // set up output field
    outputLabel = new JLabel("Test Output");
    outputField = new JTextField(20);
    outputField.setEditable(false);
    c.add(outputLabel);
    c.add(outputField);
 
    // calls updateDisplay
    updateDisplay();                                               
  }
   
  // set up a response depending on weather the input is in the 
  // length or width field
  public void actionPerformed(ActionEvent e)                         
  {
    if (e.getSource() == lengthField)
    {
      rect.setLength(Float.parseFloat(lengthField.getText()));
    }
 
    else if (e.getSource() == widthField)
    {
      rect.setWidth(Float.parseFloat(widthField.getText()));
    }
 
    updateDisplay(); 
    // calls updateDisplay
  }
 
  // display results in the output field
  public void updateDisplay()                                        
  {
    outputField.setText("Length:" + rect.getLength() + "\nWidth:" + 
        rect.getWidth() + "\nPerimeter:" + rect.getPerimeter() + "\nArea:" + 
        rect.getArea());
  }
}

[ edited to alleviate need to scroll left-right -ds ]
[ April 08, 2004: Message edited by: Dirk Schreckmann ]

[Ashok C. Mohan]

 
public void setLength (float x)                 // set length
{
    x= (( x>=1 & x<20) ? x:1);                  // range validation
}
public void setWidth (float y)                  // set width
{
   y= (( y>=1 & y<20) ? y:1);                // range validation
}
 

Here the x and y are local to the methods,setting those values will not have any effect in mainx and mainy.try setting the mainx and mainy values instead of x and y in the setter methods....

[Amit Ghai]

you have done a small mistake.
in your setLength you are assigning value to x and y
change that to mainX and mainY. Then your program will display wt u want.
public void setLength(float x) // set length
{
mainX = ((x >= 1 & x < 20) ? x : 1); // range validation
}
public void setWidth(float y) // set width
{
mainY = ((y >= 1 & y < 20) ? y : 1); // range validation
}