我正在尝试创建一个简单的小费计算器程序,但是,对于一般的操作侦听器,我有点新,所以我不确定自己做错了什么。 我希望按钮更新num的值,将其格式化为一个字符串,然后更改标签的文本(显示用户输入的内容(这是账单金额))。如何将两个动作添加到JButton?提示计算器程序
这里是我的代码:
package calculatorCW;
import java.awt.Color;
import java.awt.event.*;
import java.text.DecimalFormat;
import java.text.ParseException;
import javax.swing.*;
public class calGui {
double tip = 0;
String num = "000.00", output1 = "00.00", output2 = "00.00";
JFrame frame = new JFrame();
JPanel myPanel = new JPanel();
JLabel label1, label2, label3, label4;
JTextField myText1, myText2;
JButton buttons, tBtn1, tBtn2, tBtn3, calc, btn0;
DecimalFormat formatter = new DecimalFormat();
private int i = 1;
public calGui() {
initializeLabels();
initializeTextFields();
initializeButtons();
setPanels();
setBounds();
guiExtras();
setActionListeners();
}
public static void main(String[] args) {
new calGui();
}
public void initializeLabels() {
label1 = new JLabel("<html> <p style='font-size: 15px; color: red;'> TIP CALCULATOR </p></html>");
label2 = new JLabel("<html> <p style='color: white;'> Bill Amount:</p></html> ");
label3 = new JLabel("<html> <p style='color: white;'>Tip Percentage: </p></html>");
label4 = new JLabel("<html> <p style='color: white;'>Total Cost: </p></html>");
}
public void initializeTextFields() {
myText1 = new JTextField(output1);
myText2 = new JTextField(output2);
}
public void initializeButtons() {
tBtn1 = new JButton("<html> <p style='color: blue;'>15 %</p></html>");
tBtn2 = new JButton("<html> <p style='color: blue;'>18 %</p></html>");
tBtn3 = new JButton("<html> <p style='color: blue;'>20 %</p></html>");
calc = new JButton("<html> <p style='color: black;'>CALC</p></html>");
btn0 = new JButton("0");
//Buttons Loop
for (int col = 50; col <= 190; col = col + 70) {
for (int row = 253; row <= 393; row = row + 70) {
buttons = new JButton("" + i);
myPanel.add(buttons);
buttons.setBounds(row, col, 60, 50);
buttons.setActionCommand(String.valueOf(i));
i++;
}
}
}
public void setPanels() {
myPanel.add(tBtn1);
myPanel.add(tBtn2);
myPanel.add(tBtn3);
myPanel.add(calc);
myPanel.add(btn0);
myPanel.add(label1);
myPanel.add(label2);
myPanel.add(label3);
myPanel.add(label4);
myPanel.add(myText1);
myPanel.add(myText2);
}
public void setBounds() {
tBtn1.setBounds(23, 90, 60, 50);
tBtn2.setBounds(93, 90, 60, 50);
tBtn3.setBounds(163, 90, 60, 50);
calc.setBounds(13, 190, 100, 50);
btn0.setBounds(323, 260, 60, 50);
label1.setBounds(155, -5, 200, 50);
label2.setBounds(13, 50, 100, 20);
label3.setBounds(13, 70, 200, 20);
label4.setBounds(13, 160, 100, 20);
myText1.setBounds(96, 50, 100, 20);
myText2.setBounds(96, 160, 100, 20);
}
public void guiExtras() {
myPanel.setLayout(null);
myPanel.setSize(500, 400);
frame.add(myPanel);
frame.setBounds(600, 50, 500, 400);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
myText1.setEditable(false);
myText2.setEditable(false);
//myPanel.setOpaque(true);
myPanel.setBackground(Color.black);
}
public void setActionListeners() {
//bill amounts
buttons.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
num = num + (e.getActionCommand());
}
});
buttons.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try {
output1 = formatter.format(formatter.parse(num));
myText1.setText(output1);
} catch (ParseException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
});
//tips
tBtn1.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
tip = .15;
}
});
tBtn2.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
tip = .18;
}
});
tBtn3.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
tip = .20;
}
});
}
}
至少告诉你发布的代码有什么问题,并提出一个更具体的问题,而不是一堆要求。 –
欢迎来到Stack Overflow!你已经在你的问题中发布了很多代码,这使得我们(以及未来的读者)不清楚问题出在哪里。请将您的问题代码减少到10行或更少。请参阅:[如何创建最小,完整和可验证示例](http://stackoverflow.com/help/mcve)和[如何调试小程序](https://ericlippert.com/2014/03/05 /如何调试的小程序/)。 –
当我点击gui上的一个数字时,它没有更新账单数量Jlabel从“00.00”到用户输入的数字 –