JAVA GUI TempConverter.java

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;

public class TempConverter
{
JFrame myframe = new JFrame("華氏與攝氏溫度的轉換");
JTextField result = new JTextField(); //轉換結果顯示區
JTextField degree = new JTextField(); //輸入區
JButton f2c = new JButton("華氏轉攝氏");
JButton c2f = new JButton("攝氏轉華氏");
public static void main(String[] args)
{
TempConverter test = new TempConverter();
}
public TempConverter()
{
//先取得ContentPane物件
Container contentPane = myframe.getContentPane();

//將5個元件加到BroderLayout的五個位置
contentPane.add(new JLabel("請輸入溫度"),BorderLayout.NORTH);
contentPane.add(f2c,BorderLayout.EAST);
contentPane.add(c2f,BorderLayout.WEST);
contentPane.add(degree,BorderLayout.CENTER);
contentPane.add(result,BorderLayout.SOUTH);
//華氏轉攝氏按鈕的 ActionListener()
f2c.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
try{
//取得束入區的字串，並轉成浮點數
double f = Double.parseDouble(degree.getText());
//進行轉換，並將結果寫道視窗最下方
result.setText("華氏 "+f+" 度等於攝氏" + ((f-32)*5/9) + " 度");
}
catch(NumberFormatException ne)
{
degree.setText(""); //發生例外時清除輸入區內容
}
}
}
);

//攝氏 轉華氏按鈕的ActionListener()
c2f.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e)
{
try{
//取得輸入區的字串，並轉成浮點數
double c = Double.parseDouble(degree.getText());
//進行轉換，並將結果寫道視窗最下方
result.setText("攝氏 " + c + "  度等於華氏 " + (c/5*9+32)+"度");
}
catch(NumberFormatException ne)
{
degree.setText(""); //發生例外時清除輸入區內容
}
}
}
);
myframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
myframe.setSize(400,120);
myframe.setVisible(true);
}
}