convertawt2.java

小的程序,可以很简单的把一个化石温度转变成为设施温度

import java.awt.*;
import java.awt.event.*;

public class ConvertAWT2 extends Frame {
  private Label fahrenheitLabel;
  private TextField fahrenheitField;
  private Label centigradeLabel;
  private TextField centigradeField;
  private Button fahrenheitButton;
  private Button centigradeButton;
  
  private Panel p1,p2;

  // The instance of the following member class will be used as a listener
  // for WindowEvent and ActionEvent

  class GenericListener extends WindowAdapter implements ActionListener {
     public void windowClosing (WindowEvent e) { System.exit(0); }  
     public void actionPerformed(ActionEvent e){
        int fahrenheit, centigrade;
        if (e.getSource()==fahrenheitButton) {
            fahrenheit = getFahrenheit();
            centigrade=(int) ( (fahrenheit  - 32.0) * 5.0 / 9.0); 
            centigradeField.setText("" + centigrade);
        } else {
            centigrade=getCentigrade();
            fahrenheit =(int) ( centigrade * 9.0 / 5.0 + 32.0); 
            fahrenheitField.setText("" + fahrenheit);    
        }
     }
  }
 

  public ConvertAWT2() {    // constructor
    fahrenheitLabel = new Label("Degress Fahrenheit");
    fahrenheitField = new TextField("32",6);
    centigradeLabel = new Label("Degress Centigrade");
    centigradeField = new TextField("0",6);

    

    fahrenheitButton = new Button(">>>>>>");
    centigradeButton = new Button("<<<<<<");

    p1=new Panel();   p2=new Panel();
    p1.setLayout(new GridLayout(2,2));
    p2.setLayout(new GridLayout(1,2));

    p1.add(fahrenheitLabel);
    p1.add(centigradeLabel);
    p1.add(fahrenheitField);
    p1.add(centigradeField);
    p2.add(fahrenheitButton);
    p2.add(centigradeButton);
    
    add("North", p1);
    add("South",p2);
    
    // register event listeners
    GenericListener gl = new GenericListener(); 
    fahrenheitButton.addActionListener(gl);
    centigradeButton.addActionListener(gl);
    addWindowListener(gl);

  }  // end constructor       
       
  public int getFahrenheit() {
    String str = fahrenheitField.getText().trim();
    int fahrenheit = (new Integer(str)).intValue();
    return fahrenheit;
  }

  public int getCentigrade() {
    String str     = centigradeField.getText().trim();
    int centigrade = (new Integer(str)).intValue();
    return centigrade;
  }

  public static void main(String[] args) {
    Frame frm = new ConvertAWT2();
    frm.setSize(250,150);
    frm.setVisible(true);
  }
}