求解 - Java - Chinaunix - Powered by Discuz! Archiver

飞云豹 发表于 2012-12-17 20:23

求解

我学java一周尝试做了个计算器运行没报错但单击按钮文本框中不显示相应的数字，郁闷求大师帮忙找找错
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextField;

public class edec extends JFrame implements ActionListener {
private JFrame frame;
private JButton button1, button2, button3, button4, button5, button6,
button7, button8, button9, button0, buttonadd, buttonreduce,
buttonride, buttondivide, buttonpoint, buttonequal;
private JTextField textField;
String string;

public void init() {
getContentPane().setLayout(null);
setBounds(100, 100, 291, 280);
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

final JButton button1 = new JButton();
button1.setBackground(Color.WHITE);
button1.setText("1");
button1.setBounds(10, 88, 59, 29);
getContentPane().add(button1);
button1.addActionListener(this);

final JButton button2 = new JButton();
button2.setBackground(Color.WHITE);
button2.setText("2");
button2.setBounds(75, 88, 59, 29);
getContentPane().add(button2);
button2.addActionListener(this);

final JButton button3 = new JButton();
button3.setBackground(Color.WHITE);
button3.setText("3");
button3.addActionListener(this);
button3.setBounds(140, 88, 59, 29);
getContentPane().add(button3);
button3.addActionListener(this);

final JButton button4 = new JButton();
button4.setBackground(Color.WHITE);
button4.setText("4");
button4.setBounds(10, 123, 59, 29);
getContentPane().add(button4);
button4.addActionListener(this);

final JButton button5 = new JButton();
button5.setBackground(Color.WHITE);
button5.setText("5");
button5.setBounds(75, 123, 59, 29);
getContentPane().add(button5);
button5.addActionListener(this);

final JButton button6 = new JButton();
button6.setBackground(Color.WHITE);
button6.setText("6");
button6.setBounds(140, 123, 59, 29);
getContentPane().add(button6);
button6.addActionListener(this);

final JButton button7 = new JButton();
button7.setBackground(Color.WHITE);
button7.setText("7");
button7.setBounds(10, 158, 59, 29);
getContentPane().add(button7);
button7.addActionListener(this);

final JButton button8 = new JButton();
button8.setBackground(Color.WHITE);
button8.setText("8");
button8.setBounds(75, 158, 59, 29);
getContentPane().add(button8);
button8.addActionListener(this);

final JButton button9 = new JButton();
button9.setBackground(Color.WHITE);
button9.setText("9");
button9.setBounds(140, 158, 59, 29);
getContentPane().add(button9);
button9.addActionListener(this);

final JButton button0 = new JButton();
button0.setBackground(Color.WHITE);
button0.setText("0");
button0.setBounds(10, 193, 59, 29);
getContentPane().add(button0);
button0.addActionListener(this);

final JButton buttonpoint = new JButton();
buttonpoint.setBackground(Color.WHITE);
buttonpoint.setText(".");
buttonpoint.setBounds(75, 193, 59, 29);
getContentPane().add(buttonpoint);
button0.addActionListener(this);

final JButton buttonequal = new JButton();
buttonequal.setBackground(Color.WHITE);
buttonequal.setText("=");
buttonequal.setBounds(140, 193, 59, 29);
getContentPane().add(buttonequal);
buttonequal.addActionListener(this);

final JButton buttondivide = new JButton();
buttondivide.setBackground(Color.WHITE);
buttondivide.setText("/");
buttondivide.setBounds(205, 88, 59, 29);
getContentPane().add(buttondivide);
buttondivide.addActionListener(this);

final JButton buttonride = new JButton();
buttonride.setBackground(Color.WHITE);
buttonride.setText("*");
buttonride.setBounds(205, 123, 59, 29);
getContentPane().add(buttonride);
buttonride.addActionListener(this);

final JButton buttonreduce = new JButton();
buttonreduce.setBackground(Color.WHITE);
buttonreduce.setText("-");
buttonreduce.setBounds(205, 158, 59, 29);
getContentPane().add(buttonreduce);
buttonreduce.addActionListener(this);

final JButton buttonadd = new JButton();
buttonadd.setBackground(Color.WHITE);
buttonadd.setText("+");
buttonadd.setBounds(205, 193, 59, 29);
getContentPane().add(buttonadd);
buttonadd.addActionListener(this);

final JTextField textField = new JTextField();
textField.setBounds(10, 53, 254, 29);
getContentPane().add(textField);
}

public static void main(String args[]) {
edec frame = new edec();
frame.setVisible(true);
frame.init();

}
String foreNum = null;
String currNum = null;
String currOpr = null;

public void actionPerformed(ActionEvent e) {
Object object = e.getSource();
if (object == button0 || object == button1 || object == button3
|| object == button2 || object == button4 || object == button5
|| object == button6 || object == button7 || object == button8
|| object == button9) {
textField.setText(e.getActionCommand());
} else if (object == buttonpoint) {
textField.setText(textField.getText() + '.');
} else if (object == buttonadd || object == buttonreduce
|| object == buttonride || object == buttonride) {
currNum = textField.getText();
if (currOpr == "+")
textField.setText(String.valueOf(Double.parseDouble(foreNum)
+ Double.parseDouble(currNum)));
else if (currOpr == "-")
textField.setText(String.valueOf(Double.parseDouble(foreNum)
- Double.parseDouble(currNum)));
else if (currOpr == "*")
textField.setText(String.valueOf(Double.parseDouble(foreNum)
* Double.parseDouble(currNum)));
else if (currOpr == "/") {
if (Double.parseDouble(textField.getText()) == 0)
textField.setText("除数不能为零");
else
textField
.setText(String.valueOf(Double.parseDouble(foreNum)
/ Double.parseDouble(currNum)));
}
} else if (object == buttonequal) {
currNum = textField.getText();
if (currOpr == "+")
textField.setText(String.valueOf(Double.parseDouble(foreNum)
+ Double.parseDouble(currNum)));
else if (currOpr == "-")
textField.setText(String.valueOf(Double.parseDouble(foreNum)
- Double.parseDouble(currNum)));
else if (currOpr == "*")
textField.setText(String.valueOf(Double.parseDouble(foreNum)
* Double.parseDouble(currNum)));
else if (currOpr == "/") {
if (Double.parseDouble(textField.getText()) == 0)
textField.setText("除数不能为零");
else
textField
.setText(String.valueOf(Double.parseDouble(foreNum)
/ Double.parseDouble(currNum)));
}
}

}
}

方兆国 发表于 2013-01-13 14:42

回复 1# 飞云豹

你的代码里面怎么有这个 public void init() ，你做的事JApplet吗

方兆国 发表于 2013-01-13 14:48

public void actionPerformed(ActionEvent e) 是这个么？好久不用，忘了if (object == buttonequal) {
                     currNum = textField.getText();
                     if (currOpr == "+")
                           textField.setText(String.valueOf(Double.parseDouble(foreNum)
                                             + Double.parseDouble(currNum)));
                     else if (currOpr == "-")
                           textField.setText(String.valueOf(Double.parseDouble(foreNum)
                                             - Double.parseDouble(currNum)));
                     else if (currOpr == "*")
                           textField.setText(String.valueOf(Double.parseDouble(foreNum)
                                             * Double.parseDouble(currNum)));
                     else if (currOpr == "/") {
                           if (Double.parseDouble(textField.getText()) == 0)
                                    textField.setText("除数不能为零");
                           else
                                    textField.setText(String.valueOf(Double.parseDouble(foreNum)
                                                                     / Double.parseDouble(currNum)));
                     }而且这一段儿，看着怪怪的
貌似不是String.valueOf(),而是.....toString()吧

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