GUI问题（计算器）
我把此题分为三个类来处理的，不知为何编译就是不能够通过（在下面已标出），不知哪位高手可否指导一下？！程序代码：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class InputPanel extends JPanel {
public JTextField tf1, tf2, tfResult;
private JLabel label1, label2, label3;
public void init() {
setBackground(Color.CYAN);
setLayout(new GridLayout(3,1,5,8));
label1 = new JLabel("操作数1");
label2 = new JLabel("操作数2");
label3 = new JLabel("结果");
tf1 = new JTextField();
tf2 = new JTextField();
tfResult = new JTextField();
add(label1);
add(tf1);
add(label2);
add(tf2);
add(label3);
add(tfResult);
}
public JTextField getTf1() {
return tf1;
}
public JTextField getTf2() {
return tf2;
}
public JTextField getTfResult() {
return tfResult;
}
}
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class CalculatorPanel extends JPanel {
private JRadioButton rdbPlus, rdbMinus, rdbMulti, rdbDivide;
private ButtonGroup btg;
private JButton bt1, bt2;
private InputPanel iPanel;
double n1, n2, n3;
public void init() {
setLayout(new GridLayout(1,5,5,8));
rdbPlus = new JRadioButton("加");
rdbMinus = new JRadioButton("减");
rdbMulti = new JRadioButton("乘");
rdbDivide = new JRadioButton("除");
bt1 = new JButton("运算");
bt2 = new JButton("重置");
btg = new ButtonGroup();
btg.add(rdbPlus);
btg.add(rdbMinus);
btg.add(rdbMulti);
btg.add(rdbDivide);
add(rdbPlus);
add(rdbMinus);
add(rdbMulti);
add(rdbDivide);
add(bt1);
add(bt2);
}
public JRadioButton getRdbPlus() {
return rdbPlus;
}
public JRadioButton getRdbMinus() {
return rdbMinus;
}
public JRadioButton getRdbMulti() {
return rdbMulti;
}
public JRadioButton getRdbDivide() {
return rdbDivide;
}
public JButton getBt1() {
return bt1;
}
public JButton getBt2() {
return bt2;
}
}
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class CalculatorDemo extends JFrame implements ActionListener {
InputPanel iPanel ;
CalculatorPanel cPanel;
CalculatorDemo() {
super("计算器");
setSize(400,300);
setLocation(300,200);
iPanel = new InputPanel();
cPanel = new CalculatorPanel();
cPanel.getRdbPlus().addActionListener(this); // 此处不能通过编译
cPanel.getRdbMinus().addActionListener(this);
cPanel.getRdbMulti().addActionListener(this);
cPanel.getRdbDivide().addActionListener(this);
cPanel.getBt1().addActionListener(this);
cPanel.getBt2().addActionListener(this);
this.getContentPane().setLayout(new BorderLayout(0,80));
this.getContentPane().add(iPanel,BorderLayout.CENTER);
this.getContentPane().add(cPanel,BorderLayout.SOUTH);
iPanel.init();
cPanel.init();
}
public static void main(String[] args){
CalculatorDemo frame = new CalculatorDemo(); // 还有此处不能通过编译
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void actionPerformed(ActionEvent e) {
double n1 = 0.0;
double n2 = 0.0;
double n3 = 0.0;
if(e.getSource() instanceof JRadioButton) {
if(e.getActionCommand().equals("加")) {
n1 = Double.parseDouble(iPanel.getTf1().getText());
n2 = Double.parseDouble(iPanel.getTf2().getText());
}
if(e.getActionCommand().equals("减")) {
n1 = Double.parseDouble(iPanel.getTf1().getText());
n2 = Double.parseDouble(iPanel.getTf2().getText());
}
if(e.getActionCommand().equals("乘")) {
n1 = Double.parseDouble(iPanel.getTf1().getText());
n2 = Double.parseDouble(iPanel.getTf2().getText());
}
if(e.getActionCommand().equals("除")) {
n1 = Double.parseDouble(iPanel.getTf1().getText());
n2 = Double.parseDouble(iPanel.getTf2().getText());
}
}
if(e.getSource() == cPanel.getBt1()) {
n3 = n1 + n2;
iPanel.getTfResult().setText("" + n3);
}
if(e.getSource() == cPanel.getBt1()) {
n3 = n1 - n2;
iPanel.getTfResult().setText("" + n3);
}
if(e.getSource() == cPanel.getBt1()) {
n3 = n1 * n2;
iPanel.getTfResult().setText("" + n3);
}
if(e.getSource() == cPanel.getBt1()) {
n3 = n1 / n2;
iPanel.getTfResult().setText("" + n3);
}
if(e.getSource() == cPanel.getBt2()) {
iPanel.getTf1().setText(null);
iPanel.getTf2().setText(null);
iPanel.getTfResult().setText(null);
iPanel.getTf1().grabFocus();
}
}
}
[ 本帖最后由 bondy 于 2010-11-19 22:06 编辑 ]
----------------解决方案--------------------------------------------------------
程序代码：
/* InputPanel类 */
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class InputPanel extends JPanel {
private JTextField tf1, tf2, tfResult;
private JLabel label1, label2, label3;
public void init() {
setBackground(Color.CYAN);
setLayout(new GridLayout(3,1,5,8));
label1 = new JLabel("操作数1");
label2 = new JLabel("操作数2");
label3 = new JLabel("结果");
tf1 = new JTextField();
tf2 = new JTextField();
tfResult = new JTextField();
add(label1);
add(tf1);
add(label2);
add(tf2);
add(label3);
add(tfResult);
}
public JTextField getTf1() {
return tf1;
}
public JTextField getTf2() {
return tf2;
}
public JTextField getTfResult() {
return tfResult;
}
}
/* CalculatorPanel类 */
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class CalculatorPanel extends JPanel {
private JRadioButton rdbPlus, rdbMinus, rdbMulti, rdbDivide;
private ButtonGroup btg;
public JButton bt1, bt2;
private InputPanel iPanel;
public void init() {
setLayout(new GridLayout(1,5,5,8));
rdbPlus = new JRadioButton("加");
rdbMinus = new JRadioButton("减");
rdbMulti = new JRadioButton("乘");
rdbDivide = new JRadioButton("除");
bt1 = new JButton("运算");
bt1.setBackground(new Color(0,255,0));
bt2 = new JButton("重置");
bt2.setBackground(new Color(0,255,0));
btg = new ButtonGroup(); //创建一个按钮组控件
btg.add(rdbPlus);
btg.add(rdbMinus);
btg.add(rdbMulti);
btg.add(rdbDivide);
add(rdbPlus);
add(rdbMinus);
add(rdbMulti);
add(rdbDivide);
add(bt1);
add(bt2);
}
public JRadioButton getRdbPlus() {
return rdbPlus;
}
public JRadioButton getRdbMinus() {
return rdbMinus;
}
public JRadioButton getRdbMulti() {
return rdbMulti;
}
public JRadioButton getRdbDivide() {
return rdbDivide;
}
public JButton getBt1() {
return bt1;
}
public JButton getBt2() {
return bt2;
}
}
/* CalculatorDemo类 */
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
public class CalculatorDemo extends JFrame implements ActionListener {
InputPanel iPanel ;
CalculatorPanel cPanel;
private int symbol;
double n1 = 0.0;
double n2 = 0.0;
double n3 = 0.0;
CalculatorDemo() {
super("计算器");
setSize(400,300);
setLocation(300,200);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
iPanel = new InputPanel();
cPanel = new CalculatorPanel();
iPanel.init();
cPanel.init();
//this.getContentPane().setLayout(new BorderLayout(0,80));
setLayout(new BorderLayout(0,80));
add(iPanel,BorderLayout.CENTER);
add(cPanel,BorderLayout.SOUTH);
cPanel.getRdbPlus().addActionListener(this);
cPanel.getRdbMinus().addActionListener(this);
cPanel.getRdbMulti().addActionListener(this);
cPanel.getRdbDivide().addActionListener(this);
cPanel.getBt1().addActionListener(this);
cPanel.getBt2().addActionListener(this);
}
public void actionPerformed(ActionEvent e) {
if(e.getSource() instanceof JRadioButton) {
n1 = Double.parseDouble(iPanel.getTf1().getText());
n2 = Double.parseDouble(iPanel.getTf2().getText());
if(e.getActionCommand().equals("加")) {
symbol = 1;
}
if(e.getActionCommand().equals("减")) {
symbol = 2;
}
if(e.getActionCommand().equals("乘")) {
symbol = 3;
}
if(e.getActionCommand().equals("除")) {
symbol = 4;
}
}
if(e.getSource() == cPanel.getBt1()) {
switch(symbol)
{
case 1:
n3 = n1 + n2;
break;
case 2:
n3 = n1 - n2;
break;
case 3:
n3 = n1 * n2;
break;
case 4:
try {
n3 = n1 / n2;
} catch(ArithmeticException ae) {
ae.printStackTrace();
} finally {
System.out.println("divide by 0,please input again!");
}
break;
}
iPanel.getTfResult().setText(String.valueOf(n3));
}
if(e.getSource() == cPanel.getBt2()) {
iPanel.getTf1().setText(null);
iPanel.getTf2().setText(null);
iPanel.getTfResult().setText(null);
cPanel.getRdbPlus().setSelected(false);
cPanel.getRdbMinus().setSelected(false);
cPanel.getRdbMulti().setSelected(false);
cPanel.getRdbDivide().setSelected(false);
}
}
public static void main(String[] args){
new CalculatorDemo().setVisible(true);
}
}
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class InputPanel extends JPanel {
private JTextField tf1, tf2, tfResult;
private JLabel label1, label2, label3;
public void init() {
setBackground(Color.CYAN);
setLayout(new GridLayout(3,1,5,8));
label1 = new JLabel("操作数1");
label2 = new JLabel("操作数2");
label3 = new JLabel("结果");
tf1 = new JTextField();
tf2 = new JTextField();
tfResult = new JTextField();
add(label1);
add(tf1);
add(label2);
add(tf2);
add(label3);
add(tfResult);
}
public JTextField getTf1() {
return tf1;
}
public JTextField getTf2() {
return tf2;
}
public JTextField getTfResult() {
return tfResult;
}
}
/* CalculatorPanel类 */
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class CalculatorPanel extends JPanel {
private JRadioButton rdbPlus, rdbMinus, rdbMulti, rdbDivide;
private ButtonGroup btg;
public JButton bt1, bt2;
private InputPanel iPanel;
public void init() {
setLayout(new GridLayout(1,5,5,8));
rdbPlus = new JRadioButton("加");
rdbMinus = new JRadioButton("减");
rdbMulti = new JRadioButton("乘");
rdbDivide = new JRadioButton("除");
bt1 = new JButton("运算");
bt1.setBackground(new Color(0,255,0));
bt2 = new JButton("重置");
bt2.setBackground(new Color(0,255,0));
btg = new ButtonGroup(); //创建一个按钮组控件
btg.add(rdbPlus);
btg.add(rdbMinus);
btg.add(rdbMulti);
btg.add(rdbDivide);
add(rdbPlus);
add(rdbMinus);
add(rdbMulti);
add(rdbDivide);
add(bt1);
add(bt2);
}
public JRadioButton getRdbPlus() {
return rdbPlus;
}
public JRadioButton getRdbMinus() {
return rdbMinus;
}
public JRadioButton getRdbMulti() {
return rdbMulti;
}
public JRadioButton getRdbDivide() {
return rdbDivide;
}
public JButton getBt1() {
return bt1;
}
public JButton getBt2() {
return bt2;
}
}
/* CalculatorDemo类 */
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
public class CalculatorDemo extends JFrame implements ActionListener {
InputPanel iPanel ;
CalculatorPanel cPanel;
private int symbol;
double n1 = 0.0;
double n2 = 0.0;
double n3 = 0.0;
CalculatorDemo() {
super("计算器");
setSize(400,300);
setLocation(300,200);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
iPanel = new InputPanel();
cPanel = new CalculatorPanel();
iPanel.init();
cPanel.init();
//this.getContentPane().setLayout(new BorderLayout(0,80));
setLayout(new BorderLayout(0,80));
add(iPanel,BorderLayout.CENTER);
add(cPanel,BorderLayout.SOUTH);
cPanel.getRdbPlus().addActionListener(this);
cPanel.getRdbMinus().addActionListener(this);
cPanel.getRdbMulti().addActionListener(this);
cPanel.getRdbDivide().addActionListener(this);
cPanel.getBt1().addActionListener(this);
cPanel.getBt2().addActionListener(this);
}
public void actionPerformed(ActionEvent e) {
if(e.getSource() instanceof JRadioButton) {
n1 = Double.parseDouble(iPanel.getTf1().getText());
n2 = Double.parseDouble(iPanel.getTf2().getText());
if(e.getActionCommand().equals("加")) {
symbol = 1;
}
if(e.getActionCommand().equals("减")) {
symbol = 2;
}
if(e.getActionCommand().equals("乘")) {
symbol = 3;
}
if(e.getActionCommand().equals("除")) {
symbol = 4;
}
}
if(e.getSource() == cPanel.getBt1()) {
switch(symbol)
{
case 1:
n3 = n1 + n2;
break;
case 2:
n3 = n1 - n2;
break;
case 3:
n3 = n1 * n2;
break;
case 4:
try {
n3 = n1 / n2;
} catch(ArithmeticException ae) {
ae.printStackTrace();
} finally {
System.out.println("divide by 0,please input again!");
}
break;
}
iPanel.getTfResult().setText(String.valueOf(n3));
}
if(e.getSource() == cPanel.getBt2()) {
iPanel.getTf1().setText(null);
iPanel.getTf2().setText(null);
iPanel.getTfResult().setText(null);
cPanel.getRdbPlus().setSelected(false);
cPanel.getRdbMinus().setSelected(false);
cPanel.getRdbMulti().setSelected(false);
cPanel.getRdbDivide().setSelected(false);
}
}
public static void main(String[] args){
new CalculatorDemo().setVisible(true);
}
}
----------------解决方案--------------------------------------------------------