JAVA的GUI距离转换器不使用单选按钮转换

-4

当你运行该文件，它将工作，直到你把一个数字放在文本字段，然后它打破并说空字符串。我只需要帮助这部分。我在英寸字段中使用1英寸转换为厘米。其余评论我只是为了测试和专注于厘米。没有评论它仍然以同样的方式崩溃。这个问题似乎是来自作为行为监听者的行529区域。任何和所有的帮助将是美好的和appriciatedJAVA的GUI距离转换器不使用单选按钮转换

package hardingconversiongui; 

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


public class GuiConversion extends JFrame { 

private JPanel panel1;     // A holding panel 
private JPanel panel2; 
private JPanel panel3; 
private JPanel panel4; 
private JPanel panel5; 
private JPanel panel6; 
private JPanel panel7; 
private JPanel panel8; 
private JPanel panel9; 
private JPanel panel10; 
private JPanel panel11; 
private JLabel messageLabel; 
private JTextField textField; 
private ButtonGroup radioButtonGroup; 
private final int WINDOW_WIDTH = 900; 
private final int WINDOW_HEIGHT = 900; 
private JRadioButton centimetersButton; 
private JRadioButton metersButton; 
private JRadioButton yardsButton; 
private JRadioButton milesButton; 
private JRadioButton feetButton; 
private JRadioButton inchesButton; 
private JRadioButton kilometersButton; 
private JRadioButton squaremetersButton; 
private JRadioButton squareyardsButton; 
private JRadioButton squarefeetButton; 
private JRadioButton squareinchesButton; 
private JRadioButton cubicfeetButton; 
private JRadioButton cubicinchesButton; 
private JRadioButton cubicmetersButton; 
private JRadioButton cubicyardsButton; 
private JRadioButton ouncesButton; 
private JRadioButton kilogramsButton; 
private JRadioButton poundsButton; 
private JRadioButton gramsButton; 
private JRadioButton quartsButton; 
private JRadioButton pintsButton; 
private JRadioButton cupsButton; 
private JRadioButton gallonsButton; 

/** 
* Constructor 
*/ 
public GuiConversion() { 
    // Set the title. 
    setTitle("CONVERTER"); 

    // Set the size of the window. 
    setSize(WINDOW_WIDTH, WINDOW_HEIGHT); 

    setLayout(new GridLayout(11, 1)); 

    // Specify an action for the close button. 
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

    // Build the panel and add it to the frame. 
    buildPanel1(); 

    // Add the panel to the frame's content pane. 
    add(panel1); 

    buildPanel2(); 
    add(panel2); 

    buildPanel3(); 
    add(panel3); 

    buildPanel4(); 
    add(panel4); 

    buildPanel5(); 
    add(panel5); 

    buildPanel6(); 
    add(panel6); 

    buildPanel7(); 
    add(panel7); 

    buildPanel8(); 
    add(panel8); 

    buildPanel9(); 
    add(panel9); 

    buildPanel10(); 
    add(panel10); 

    buildPanel11(); 
    add(panel11); 

    // Display the window. 
    setVisible(true); 

} 

/** 
* The buildPanel method adds a label, text field, and and three buttons to 
* a panel. 
*/ 
private void buildPanel1() { 
    // Create the label, text field, and radio buttons. 
    messageLabel = new JLabel("Enter inches"); 
    textField = new JTextField(10); 
    centimetersButton = new JRadioButton("Convert to centimeters"); 
    metersButton = new JRadioButton("Convert to meters"); 
    feetButton = new JRadioButton("Convert to feet"); 
    yardsButton = new JRadioButton("Convert to yards"); 
    kilometersButton = new JRadioButton("Convert to kilometers"); 

    // Group the radio buttons. 
    radioButtonGroup = new ButtonGroup(); 
    radioButtonGroup.add(centimetersButton); 
    radioButtonGroup.add(metersButton); 
    radioButtonGroup.add(feetButton); 
    radioButtonGroup.add(yardsButton); 
    radioButtonGroup.add(kilometersButton); 

    // Add action listeners to the radio buttons. 
    centimetersButton.addActionListener(new RadioButtonListener()); 
    metersButton.addActionListener(new RadioButtonListener()); 
    feetButton.addActionListener(new RadioButtonListener()); 
    yardsButton.addActionListener(new RadioButtonListener()); 
    kilometersButton.addActionListener(new RadioButtonListener()); 

    // Create a panel and add the components to it. 
    panel1 = new JPanel(); 
    panel1.add(messageLabel); 
    panel1.add(textField); 
    panel1.add(centimetersButton); 
    panel1.add(metersButton); 
    panel1.add(feetButton); 
    panel1.add(yardsButton); 
    panel1.add(kilometersButton); 
} 

private void buildPanel2() { 
    // Create the label, text field, and radio buttons. 
    messageLabel = new JLabel("Enter feet"); 
    textField = new JTextField(10); 
    metersButton = new JRadioButton("Convert to meters"); 
    yardsButton = new JRadioButton("Convert to yards"); 
    kilometersButton = new JRadioButton("Convert to kilometers"); 
    milesButton = new JRadioButton("Convert to miles"); 

    // Group the radio buttons. 
    radioButtonGroup = new ButtonGroup(); 
    radioButtonGroup.add(metersButton); 
    radioButtonGroup.add(yardsButton); 
    radioButtonGroup.add(kilometersButton); 
    radioButtonGroup.add(milesButton); 

    // Add action listeners to the radio buttons. 
    metersButton.addActionListener(new RadioButtonListener()); 
    yardsButton.addActionListener(new RadioButtonListener()); 
    kilometersButton.addActionListener(new RadioButtonListener()); 
    milesButton.addActionListener(new RadioButtonListener()); 
    // Create a panel and add the components to it. 
    panel2 = new JPanel(); 
    panel2.add(messageLabel); 
    panel2.add(textField); 
    panel2.add(metersButton); 
    panel2.add(yardsButton); 
    panel2.add(kilometersButton); 
    panel2.add(milesButton); 
} 

private void buildPanel3() { 
    messageLabel = new JLabel("Enter yards"); 
    textField = new JTextField(10); 
    metersButton = new JRadioButton("Convert to meters"); 
    feetButton = new JRadioButton("Convert to feet"); 
    kilometersButton = new JRadioButton("Convert to kilometers"); 
    milesButton = new JRadioButton("Convert to miles"); 

    radioButtonGroup = new ButtonGroup(); 
    radioButtonGroup.add(metersButton); 
    radioButtonGroup.add(feetButton); 
    radioButtonGroup.add(kilometersButton); 
    radioButtonGroup.add(milesButton); 

    metersButton.addActionListener(new RadioButtonListener()); 
    feetButton.addActionListener(new RadioButtonListener()); 
    kilometersButton.addActionListener(new RadioButtonListener()); 
    milesButton.addActionListener(new RadioButtonListener()); 

    panel3 = new JPanel(); 
    panel3.add(messageLabel); 
    panel3.add(textField); 
    panel3.add(metersButton); 
    panel3.add(feetButton); 
    panel3.add(kilometersButton); 
    panel3.add(milesButton); 
} 

private void buildPanel4() { 
    messageLabel = new JLabel("Enter square yards"); 
    textField = new JTextField(10); 
    squareinchesButton = new JRadioButton("Convert to square inches"); 
    squaremetersButton = new JRadioButton("Convert to square meters"); 
    squarefeetButton = new JRadioButton("Convert to square feet"); 

    radioButtonGroup = new ButtonGroup(); 
    radioButtonGroup.add(squareinchesButton); 
    radioButtonGroup.add(squaremetersButton); 
    radioButtonGroup.add(squarefeetButton); 

    squareinchesButton.addActionListener(new RadioButtonListener()); 
    squaremetersButton.addActionListener(new RadioButtonListener()); 
    squarefeetButton.addActionListener(new RadioButtonListener()); 

    panel4 = new JPanel(); 
    panel4.add(messageLabel); 
    panel4.add(textField); 
    panel4.add(squareinchesButton); 
    panel4.add(squaremetersButton); 
    panel4.add(squarefeetButton); 
} 

private void buildPanel5() { 
    messageLabel = new JLabel("Enter square miles"); 
    textField = new JTextField(10); 
    squareinchesButton = new JRadioButton("Convert to square inches"); 
    squarefeetButton = new JRadioButton("Convert to square feet"); 
    squareyardsButton = new JRadioButton("Convert to square yards"); 

    radioButtonGroup = new ButtonGroup(); 
    radioButtonGroup.add(squareinchesButton); 
    radioButtonGroup.add(squarefeetButton); 
    radioButtonGroup.add(squareyardsButton); 

    squareinchesButton.addActionListener(new RadioButtonListener()); 
    squarefeetButton.addActionListener(new RadioButtonListener()); 
    squareyardsButton.addActionListener(new RadioButtonListener()); 

    panel5 = new JPanel(); 
    panel5.add(messageLabel); 
    panel5.add(textField); 
    panel5.add(squareinchesButton); 
    panel5.add(squarefeetButton); 
    panel5.add(squareyardsButton); 
} 

private void buildPanel6() { 
    messageLabel = new JLabel("Enter cubic feet"); 
    textField = new JTextField(10); 
    cubicinchesButton = new JRadioButton("Convert to cubic inches"); 
    cubicmetersButton = new JRadioButton("Convert to cubic meters"); 
    cubicyardsButton = new JRadioButton("Convert to cubic yards"); 

    // Group the radio buttons. 
    radioButtonGroup = new ButtonGroup(); 
    radioButtonGroup.add(cubicinchesButton); 
    radioButtonGroup.add(cubicmetersButton); 
    radioButtonGroup.add(cubicyardsButton); 
    ; 
    cubicinchesButton.addActionListener(new RadioButtonListener()); 
    cubicmetersButton.addActionListener(new RadioButtonListener()); 
    cubicyardsButton.addActionListener(new RadioButtonListener()); 

    // Create a panel and add the components to it. 
    panel6 = new JPanel(); 
    panel6.add(messageLabel); 
    panel6.add(textField); 
    panel6.add(cubicinchesButton); 
    panel6.add(cubicmetersButton); 
    panel6.add(cubicyardsButton); 
} 

private void buildPanel7() { 
    messageLabel = new JLabel("Enter cubic yards"); 
    textField = new JTextField(10); 
    cubicinchesButton = new JRadioButton("Convert to cubic inches"); 
    cubicmetersButton = new JRadioButton("Convert to cubic meters"); 
    cubicfeetButton = new JRadioButton("Convert to cubic feet"); 

    // Group the radio buttons. 
    radioButtonGroup = new ButtonGroup(); 
    radioButtonGroup.add(cubicinchesButton); 
    radioButtonGroup.add(cubicmetersButton); 
    radioButtonGroup.add(cubicfeetButton); 

    cubicinchesButton.addActionListener(new RadioButtonListener()); 
    cubicmetersButton.addActionListener(new RadioButtonListener()); 
    cubicfeetButton.addActionListener(new RadioButtonListener()); 

    panel7 = new JPanel(); 
    panel7.add(messageLabel); 
    panel7.add(textField); 
    panel7.add(cubicinchesButton); 
    panel7.add(cubicmetersButton); 
    panel7.add(cubicfeetButton); 
} 

private void buildPanel8() { 
    messageLabel = new JLabel("Enter ounces"); 
    textField = new JTextField(10); 
    kilogramsButton = new JRadioButton("Convert to kilograms"); 
    poundsButton = new JRadioButton("Convert to pounds"); 
    gramsButton = new JRadioButton("Convert to grams"); 

    // Group the radio buttons. 
    radioButtonGroup = new ButtonGroup(); 
    radioButtonGroup.add(kilogramsButton); 
    radioButtonGroup.add(poundsButton); 
    radioButtonGroup.add(gramsButton); 

    kilogramsButton.addActionListener(new RadioButtonListener()); 
    poundsButton.addActionListener(new RadioButtonListener()); 
    gramsButton.addActionListener(new RadioButtonListener()); 

    panel8 = new JPanel(); 
    panel8.add(messageLabel); 
    panel8.add(textField); 
    panel8.add(kilogramsButton); 
    panel8.add(poundsButton); 
    panel8.add(gramsButton); 
} 

private void buildPanel9() { 
    messageLabel = new JLabel("Enter pounds"); 
    textField = new JTextField(10); 
    kilogramsButton = new JRadioButton("Convert to kilograms"); 
    ouncesButton = new JRadioButton("Convert to ounces"); 
    gramsButton = new JRadioButton("Convert to grams"); 

    radioButtonGroup = new ButtonGroup(); 
    radioButtonGroup.add(kilogramsButton); 
    radioButtonGroup.add(ouncesButton); 
    radioButtonGroup.add(gramsButton); 

    kilogramsButton.addActionListener(new RadioButtonListener()); 
    ouncesButton.addActionListener(new RadioButtonListener()); 
    gramsButton.addActionListener(new RadioButtonListener()); 

    panel9 = new JPanel(); 
    panel9.add(messageLabel); 
    panel9.add(textField); 
    panel9.add(kilogramsButton); 
    panel9.add(ouncesButton); 
    panel9.add(gramsButton); 
} 

private void buildPanel10() { 
    messageLabel = new JLabel("Enter pints"); 
    textField = new JTextField(10); 
    ouncesButton = new JRadioButton("Convert to ounces"); 
    cupsButton = new JRadioButton("Convert to cups"); 
    quartsButton = new JRadioButton("Convert to quarts"); 
    gallonsButton = new JRadioButton("Convert to gallons"); 

    radioButtonGroup = new ButtonGroup(); 
    radioButtonGroup.add(ouncesButton); 
    radioButtonGroup.add(cupsButton); 
    radioButtonGroup.add(quartsButton); 
    radioButtonGroup.add(gallonsButton); 

    ouncesButton.addActionListener(new RadioButtonListener()); 
    cupsButton.addActionListener(new RadioButtonListener()); 
    quartsButton.addActionListener(new RadioButtonListener()); 
    gallonsButton.addActionListener(new RadioButtonListener()); 

    panel10 = new JPanel(); 
    panel10.add(messageLabel); 
    panel10.add(textField); 
    panel10.add(ouncesButton); 
    panel10.add(cupsButton); 
    panel10.add(quartsButton); 
    panel10.add(gallonsButton); 
} 

private void buildPanel11() { 
    messageLabel = new JLabel("Enter quarts"); 
    textField = new JTextField(10); 
    ouncesButton = new JRadioButton("Convert to ounces"); 
    pintsButton = new JRadioButton("Convert to pints"); 
    cupsButton = new JRadioButton("Convert to cups"); 
    gallonsButton = new JRadioButton("Convert to gallons"); 

    radioButtonGroup = new ButtonGroup(); 
    radioButtonGroup.add(ouncesButton); 
    radioButtonGroup.add(pintsButton); 
    radioButtonGroup.add(cupsButton); 
    radioButtonGroup.add(gallonsButton); 

    ouncesButton.addActionListener(new RadioButtonListener()); 
    pintsButton.addActionListener(new RadioButtonListener()); 
    cupsButton.addActionListener(new RadioButtonListener()); 
    gallonsButton.addActionListener(new RadioButtonListener()); 

    panel11 = new JPanel(); 
    panel11.add(messageLabel); 
    panel11.add(textField); 
    panel11.add(ouncesButton); 
    panel11.add(pintsButton); 
    panel11.add(cupsButton); 
    panel11.add(gallonsButton); 
} 

/** 
* Private inner class that handles the event when the user clicks one of 
* the radio buttons. 
*/ 
private class RadioButtonListener implements ActionListener { 

    @Override 
    public void actionPerformed(ActionEvent e) { 
     String input;   // To hold the user's input 
     String convertTo = ""; // The units we're converting to 
     double convertingNumber = 0.0; // To hold the conversion 

     // Get the inches entered. 
     input = textField.getText(); 
     // Determine which radio button was clicked. 
     if (e.getSource() == centimetersButton) { 
      convertTo = "centimeters."; 
      convertingNumber = Double.parseDouble(input) * 2.54; 
     }/* else if (e.getSource() == metersButton) { 

      convertTo = " meters."; 
      convertingNumber = Double.parseDouble(input) * .0254; 
     } else if (e.getSource() == feetButton) { 

      convertTo = " feet."; 
      convertingNumber = Double.parseDouble(input)/12; 
     } else if (e.getSource() == yardsButton) { 

      convertTo = " yards."; 
      convertingNumber = Double.parseDouble(input)/36; 
     } else if (e.getSource() == kilometersButton) { 
      // Convert to miles. 
      convertTo = " kilometers."; 
      convertingNumber = Double.parseDouble(input) * 0.0000254; 
     }*/ 

     // Display the conversion. 
     JOptionPane.showMessageDialog(null, convertingNumber); 
    } 
} 

public static void main(String[] args) { 
    GuiConversion guiConversion = new GuiConversion(); 
} 
}

来源

2017-03-12 JavaStudent1

那么，你需要回答的第一个问题是，哪个字段实际上是输入字段。因为你已经附加了一个'ActionListener'，所以每次选择时，它都会触发'ActionListener'，而不管文本字段中输入什么。更好的解决方案可能是有一个“转换”按钮，它会触发，检查所选内容并从文本字段中读取值。在尝试转换值之前，您还应该检查输入是否为空 – MadProgrammer

您无法在每个面板中使用相同的变量'textField'。对于每件事你都需要不同的变量，否则你只是在下一个重写每个'buildPanelx'。如果你注释掉了构造函数中的所有buildPanel，但它是可行的。 – Kelo

当你建立你的屏幕，你正在使用1变量的textField。您可以使用它来创建一个新的TextField，然后将其添加到面板1，然后使用它创建一个新的TextField（失去对最后一个的引用）。这重复，直到你到最后一个。这意味着当你从“textField”对象获得“输入”值时，它只会查看你所做的最后一个（屏幕上的最后一个）。您需要为每个TextField创建一个单独的变量。 textInches，textFeet，textYards等

更新：这里有一些代码可能有助于理顺你。

package net.bcr666.javatest; 

import java.awt.BorderLayout; 
import java.awt.CardLayout; 
import java.awt.FlowLayout; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 

import javax.swing.ButtonGroup; 
import javax.swing.JButton; 
import javax.swing.JComboBox; 
import javax.swing.JFrame; 
import javax.swing.JLabel; 
import javax.swing.JPanel; 
import javax.swing.JRadioButton; 
import javax.swing.JTextField; 

public class GuiConversion extends JFrame { 
private static final long serialVersionUID = 1L; 

private JRadioButton rdoLength = new JRadioButton("Length"); 
private JRadioButton rdoArea = new JRadioButton("Area"); 
private JRadioButton rdoVolume = new JRadioButton("Volume"); 
private JRadioButton rdoWeight = new JRadioButton("Weight"); 
private JRadioButton rdoLiquidVolume = new JRadioButton("Liquid Volume"); 

ButtonGroup group = new ButtonGroup(); 
{ 
    group.add(rdoLength); 
    group.add(rdoArea); 
    group.add(rdoVolume); 
    group.add(rdoWeight); 
    group.add(rdoLiquidVolume); 
    rdoLength.setSelected(true); 
} 

CardLayout layoutCard = new CardLayout(); 
JPanel pnlCard = new JPanel(layoutCard); 

public GuiConversion() { 
// Set the title. 
setTitle("CONVERTER"); 

setLayout(new BorderLayout()); 

// Specify an action for the close button. 
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

getContentPane().add(buildSelectionPanel(), BorderLayout.NORTH); 
getContentPane().add(pnlCard, BorderLayout.CENTER); 

pnlCard.add(buildLengthPanel(), "LENGTH"); 
pnlCard.add(buildAreaPanel(), "AREA"); 
pnlCard.add(buildVolumePanel(), "VOLUME"); 
pnlCard.add(buildWeightPanel(), "WEIGHT"); 
pnlCard.add(buildLiquidVolumePanel(), "LIQUID VOLUME"); 

rdoLength.addActionListener(new ActionListener(){ 
    @Override 
    public void actionPerformed(ActionEvent arg0) { 
     layoutCard.show(pnlCard, "LENGTH"); 
    } 
}); 
rdoArea.addActionListener(new ActionListener(){ 
    @Override 
    public void actionPerformed(ActionEvent arg0) { 
     layoutCard.show(pnlCard, "AREA"); 
    } 
}); 
rdoVolume.addActionListener(new ActionListener(){ 
    @Override 
    public void actionPerformed(ActionEvent arg0) { 
     layoutCard.show(pnlCard, "VOLUME"); 
    } 
}); 
rdoWeight.addActionListener(new ActionListener(){ 
    @Override 
    public void actionPerformed(ActionEvent arg0) { 
     layoutCard.show(pnlCard, "WEIGHT"); 
    } 
}); 
rdoLiquidVolume.addActionListener(new ActionListener(){ 
    @Override 
    public void actionPerformed(ActionEvent arg0) { 
     layoutCard.show(pnlCard, "LIQUID VOLUME"); 
    } 
}); 

pack(); 
// Display the window. 
setVisible(true); 
} 

private JPanel buildSelectionPanel() { 
    JPanel panel = new JPanel(new FlowLayout()); 

    panel.add(new JLabel("Please select conversion type")); 
    panel.add(rdoLength); 
    panel.add(rdoArea); 
    panel.add(rdoVolume); 
    panel.add(rdoWeight); 
    panel.add(rdoLiquidVolume); 

    return panel; 
} 

private JPanel buildLengthPanel() { 
    JPanel panel = new JPanel(new FlowLayout()); 

    String[] inputTypes = {"Inches","Feet","Yards"}; 
    JComboBox<String> cboInputType = new JComboBox<>(inputTypes); 
    JTextField txtInputLength = new JTextField(10); 
    String[] convertTypes = {"Centimeters","Meters","Feet","Yards","Kilometers"}; 
    JComboBox<String> cboConvertType = new JComboBox<>(convertTypes); 
    JTextField txtConvertLength = new JTextField(10); 
    txtConvertLength.setEnabled(false); 
    JLabel lblConvertType = new JLabel(); 
    JButton btnConvertLength = new JButton("Convert"); 
    btnConvertLength.addActionListener(new ActionListener(){ 
     @Override 
     public void actionPerformed(ActionEvent e) { 
      try { 
       txtConvertLength.setText(""); 
       lblConvertType.setText(""); 
       double inputLength = Double.parseDouble(txtInputLength.getText()); 
       String strInputType = (String) cboInputType.getSelectedItem(); 
       String strConvertType = (String) cboConvertType.getSelectedItem(); 
       double convertFactor = 0.0d; 
       if ("Inches".equals(strInputType)) { 
        if ("Centimeters".equals(strConvertType)) { 
         convertFactor = 2.54; 
        } else if ("Meters".equals(strConvertType)) { 
         convertFactor = 0.0254; 
        } else if ("Kilometers".equals(strConvertType)) { 
         convertFactor = 0.0000254; 
        } else if ("Inches".equals(strConvertType)) { 
         convertFactor = 1.0; 
        } else if ("Feet".equals(strConvertType)) { 
         convertFactor = 0.0833333; 
        } else if ("Yards".equals(strConvertType)) { 
         convertFactor = 0.0277778; 
        } 
       } else if ("Feet".equals(strInputType)) { 
        // some conversion 
       } else if ("Yards".equals(strInputType)) { 
        // some conversion 
       } 

       double convertLength = inputLength * convertFactor; 
       txtConvertLength.setText(Double.toString(convertLength)); 
       lblConvertType.setText(strConvertType); 
       GuiConversion.this.pack(); // resize the frame to account for added text 
      } catch (Exception ex) { 
       // could not convert text to number, should probably warn the user 
      } 
     } 
    }); 

    panel.add(new JLabel("Convert ")); 
    panel.add(txtInputLength); 
    panel.add(cboInputType); 
    panel.add(new JLabel(" to ")); 
    panel.add(cboConvertType); 
    panel.add(btnConvertLength); 
    panel.add(new JLabel(" = ")); 
    panel.add(txtConvertLength); 
    panel.add(lblConvertType); 

    return panel; 
} 

private JPanel buildAreaPanel() { 
    JPanel panel = new JPanel(new FlowLayout()); 

    panel.add(new JLabel("Area")); 

    return panel; 
} 

private JPanel buildVolumePanel() { 
    JPanel panel = new JPanel(new FlowLayout()); 

    panel.add(new JLabel("Volume")); 

    return panel; 
} 

private JPanel buildWeightPanel() { 
    JPanel panel = new JPanel(new FlowLayout()); 

    panel.add(new JLabel("Weight")); 

    return panel; 
} 

private JPanel buildLiquidVolumePanel() { 
    JPanel panel = new JPanel(new FlowLayout()); 

    panel.add(new JLabel("Liwuid Volume")); 

    return panel; 
} 

public static void main(String[] args) { 
    GuiConversion guiConversion = new GuiConversion(); 
} 
}

来源

2017-03-12 21:45:32

更新：我添加了代码来帮助说明。 –

JAVA的GUI距离转换器不使用单选按钮转换

回答

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