単純な単位質量変換 GUI アプリケーションを作成しようとしています。単位を選択する 2 つのコンボ ボックス、変換する数値を入力する入力ボックス、および変換結果を表示するテキストがあります。
私の問題は、ボタンを実際に押して計算を開始しようとしているのですが、listドロップダウンコンボボックスから何かを選択すると開始されることです。テキスト ボックスに数値を入力し、2 番目のコンボ ボックスから単位を選択し、最初のコンボ ボックスから何かを選択すると、必要な変数があるため機能します。
私のコードはすぐ下にあります。
public class GuiApp{
JFrame frame;
JButton button;
JTextField field;
JLabel prompt,result,to;
JPanel contentpane;
JComboBox list,list2;
public GuiApp(){
frame = new JFrame("Mass Conversion Application");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
contentpane=new JPanel();
contentpane.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
String [] type={"Units", "Gram(s)","Kilogram(s)", "Pound(s)","Ounce(s)"};
list=new JComboBox(type);
list.setAlignmentX(JComboBox.LEFT_ALIGNMENT);
list.setSelectedIndex(0);
list.addActionListener(new converty());
contentpane.add(list);
to=new JLabel("to");
contentpane.add(to);
list2=new JComboBox(type);
list2.setAlignmentX(JComboBox.RIGHT_ALIGNMENT);
list2.setSelectedIndex(0);
list2.addActionListener(new converty());
contentpane.add(list2);
prompt=new JLabel("Enter here:");
prompt.setAlignmentX(JLabel.LEFT_ALIGNMENT);
contentpane.add(prompt);
field=new JTextField(10);
contentpane.add(field);
button=new JButton("Convert");
button.setAlignmentX(JButton.CENTER_ALIGNMENT);
button.setEnabled(false);
button.addActionListener(new converty());
button.setActionCommand("Convert");
contentpane.add(button);
result=new JLabel(" asdff ");
result.setAlignmentX(JLabel.CENTER_ALIGNMENT);
contentpane.add(result);
frame.pack();
frame.setVisible(true);
frame.setContentPane(contentpane);
}
class converty implements ActionListener{
public void actionPerformed(ActionEvent event){
if (!list.getSelectedItem().toString().equalsIgnoreCase("Units") && !list2.getSelectedItem().toString().equalsIgnoreCase("Units")){
button.setEnabled(true);
}
if (list.getSelectedItem().toString().equalsIgnoreCase(list2.getSelectedItem().toString()) && button.getActionCommand().equals("Convert")){
double thing=Double.parseDouble(field.getText());
result.setText(thing+" "+list.getSelectedItem().toString()+" is equal to "+thing+" "+list2.getSelectedItem().toString());
}
else if (list.getSelectedItem().toString().equalsIgnoreCase("Gram(s)") && !list2.getSelectedItem().toString().equalsIgnoreCase("Kilogram(s)") && button.getActionCommand().equals("Convert")){
double thing=Double.parseDouble(field.getText());
result.setText(thing+" "+list.getSelectedItem().toString()+" is equal to "+(thing/1000)+" "+list2.getSelectedItem().toString());
}
else if (list.getSelectedItem().toString().equalsIgnoreCase("Gram(s)") && !list2.getSelectedItem().toString().equalsIgnoreCase("Pound(s)") && button.getActionCommand().equals("Convert")){
double thing=Double.parseDouble(field.getText());
result.setText(thing+" "+list.getSelectedItem().toString()+" is equal to "+(thing*453.59237)+" "+list2.getSelectedItem().toString());
}
else if (list.getSelectedItem().toString().equalsIgnoreCase("Gram(s)") && !list2.getSelectedItem().toString().equalsIgnoreCase("Ounce(s)") && button.getActionCommand().equals("Convert")){
double thing=Double.parseDouble(field.getText());
result.setText(thing+" "+list.getSelectedItem().toString()+" is equal to "+(thing*28.349523125)+" "+list2.getSelectedItem().toString());
}
else if (list.getSelectedItem().toString().equalsIgnoreCase("Kilogram(s)") && !list2.getSelectedItem().toString().equalsIgnoreCase("Gram(s)") && button.getActionCommand().equals("Convert")){
double thing=Double.parseDouble(field.getText());
result.setText(thing+" "+list.getSelectedItem().toString()+" is equal to "+(thing*1000)+" "+list2.getSelectedItem().toString());
}
else if (list.getSelectedItem().toString().equalsIgnoreCase("Kilogram(s)") && !list2.getSelectedItem().toString().equalsIgnoreCase("Pound(s)") && button.getActionCommand().equals("Convert")){
double thing=Double.parseDouble(field.getText());
result.setText(thing+" "+list.getSelectedItem().toString()+" is equal to "+(thing/0.45359237)+" "+list2.getSelectedItem().toString());
}
else if (list.getSelectedItem().toString().equalsIgnoreCase("Kilogram(s)") && !list2.getSelectedItem().toString().equalsIgnoreCase("Ounce(s)") && button.getActionCommand().equals("Convert")){
double thing=Double.parseDouble(field.getText());
result.setText(thing+" "+list.getSelectedItem().toString()+" is equal to "+(thing/0.0283495231257)+" "+list2.getSelectedItem().toString());
}
else if (list.getSelectedItem().toString().equalsIgnoreCase("Ounce(s)") && !list2.getSelectedItem().toString().equalsIgnoreCase("Gram(s)") && button.getActionCommand().equals("Convert")){
double thing=Double.parseDouble(field.getText());
result.setText(thing+" "+list.getSelectedItem().toString()+" is equal to "+(thing*28.349523125)+" "+list2.getSelectedItem().toString());
}
else if (list.getSelectedItem().toString().equalsIgnoreCase("Ounce(s)") && !list2.getSelectedItem().toString().equalsIgnoreCase("Pound(s)") && button.getActionCommand().equals("Convert")){
double thing=Double.parseDouble(field.getText());
result.setText(thing+" "+list.getSelectedItem().toString()+" is equal to "+(thing/0.0625)+" "+list2.getSelectedItem().toString());
}
else if (list.getSelectedItem().toString().equalsIgnoreCase("Ounce(s)") && !list2.getSelectedItem().toString().equalsIgnoreCase("Kilogram(s)") && button.getActionCommand().equals("Convert")){
double thing=Double.parseDouble(field.getText());
result.setText(thing+" "+list.getSelectedItem().toString()+" is equal to "+(thing/0.0625)+" "+list2.getSelectedItem().toString());
}
else if (list.getSelectedItem().toString().equalsIgnoreCase("Ounce(s)") && !list2.getSelectedItem().toString().equalsIgnoreCase("Pound(s)") && button.getActionCommand().equals("Convert")){
double thing=Double.parseDouble(field.getText());
result.setText(thing+" "+list.getSelectedItem().toString()+" is equal to "+(thing/0.0625)+" "+list2.getSelectedItem().toString());
}
}
}
private static void GuiApp(){
JFrame.setDefaultLookAndFeelDecorated(true);
GuiApp greeting= new GuiApp();
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable(){
public void run() {
GuiApp();
}
});
}
}