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9.1

Java Applet

Asked by Maymoon125 in New to Java Programming

Tags: java applet

Hi all I'm trying to write a temperature conversion Applet that converts from Fahrenheit to celsius and also convertes to Kelvin. i need the program to be able to make conversions between any three scales.
the code will compile but the calculations are wrong
I did some codes but i dont like what i did maybe some body can help me with my codes
thanks

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             // Temperature Conversion Applet
import java.applet.*;
import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
 
public class calculator
	extends Applet
  	implements ActionListener
{
  	private TextField tfInput, tfResult;
  	private Button btF2C, btC2F,btF2K, btK2F, btC2K, btK2C;
 
  	private final String F2C = new String("Fahrenheit to Celsius");
  	private final String C2F = new String("Celsius to Fahrenheit");
  	private final String F2K = new String("Fahrenheit to Kelvin");
  	private final String K2F = new String("Kelvin to Fahrenheit");
  	private final String C2K = new String("Celsius to Kelvin");
  	private final String K2C = new String("Kelvin to Celsius");
 
  	//initialize user interface
  	public void init()
  	{
    	     	//set layout and foreground colors
    	     	setLayout(new BorderLayout());
    	     	setBackground(Color.white);
	     	setFont(new Font("Times New Roman", Font.PLAIN, 14));
 
    	     	//create text fields
    	     	tfInput = new TextField(6);
    	     	tfResult = new TextField(6);
 
            //set result field read only
    	     	tfResult.setEditable(false);
 
    	     	//create buttons
    	     	btF2C = new Button(F2C);
    	     	btC2F = new Button(C2F);
    	     	btF2K = new Button(F2K);
    	     	btK2F = new Button(K2F);
    	     	btC2K = new Button(C2K);
    	     	btK2C = new Button(K2C);
 
	     	//register listeners
    	     	btF2C.addActionListener(this);
    	     	btC2F.addActionListener(this);
    	     	btF2K.addActionListener(this);
    	     	btK2F.addActionListener(this);
    	     	btC2K.addActionListener(this);
    	     	btK2C.addActionListener(this);
 
    	     	//create 3 panels
    	     	Panel p1 = new Panel();
	     	p1.add(new Label(
	"Enter a temperature and select conversion type:"));
	     	p1.add(tfInput);
 
	     	Panel p2 = new Panel();
	     	p2.add(new Label("Result:"));
	     	p2.add(tfResult);
 
    	     	Panel p3 = new Panel();
    	     	p3.add(btF2C);
    	     	p3.add(btC2F);
    	     	p3.add(btF2K);
    	     	p3.add(btK2F);
    	     	p3.add(btC2K);
    	     	p3.add(btK2C);
 
		// add panels to frame
    	     	add(BorderLayout.NORTH, p1);
    	     	add(BorderLayout.CENTER, p2);
    	     	add(BorderLayout.SOUTH, p3);
  	}
 
	//event handler for buttons
  	public void actionPerformed(ActionEvent e)
  	{
    	     String actionCommand = e.getActionCommand();
    	     double t1, t2,t3,t4,t5,t6, t7;
    	     // get input temp
    	     t1=(Double.valueOf(tfInput.getText())).doubleValue();
 
    	     // compute result
    	     //F2C = (((t1 - 32) / 9) * 5);
    	     t2=actionCommand.equals(F2C) ? 5*(t1-32)/9 : 9*t1/5 + 32 ;
    	     t3=actionCommand.equals(F2K) ? (5*(t1-32)/9+273.15) : 9*t1/5 +305.15;
 
    	     // display result
    	     tfResult.setText(String.valueOf(t2));
	}
}
 
***************************************
<html>
<applet code = "calculator.class" width = "1000" height = "300">
</applet>
</html>

           
         

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Java Applet

Asked by Maymoon125 in New to Java Programming

Tags: java applet

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