将答案文本字段返回给java时遇到问题。他们不是添加整数并显示真实答案，而是将字符串添加到一起。例如，8 + 7是87而不是15。
private static final int NUMBERS = 10;
//store buttons in array
private JButton[] keys = new JButton[NUMBERS];
private JTextField keyField = new JTextField(15);
private String[] labels = new String[]{"1", "2", "3",
"4", "5", "6",
"7", "8", "9",
"0", };
private JButton bequal = new JButton("=");
private JButton bdivison = new JButton("/");
private JButton badd = new JButton("+");
private JButton bsubtract = new JButton("-");
private JButton btimes = new JButton("*");
private JButton bC = new JButton("C");
int Count=1;
public int first;
public int second;
public String what;
Calc calcObject = new Calc();
public Calculator() {
JPanel mainPanel = new JPanel(new BorderLayout());
getContentPane().add(mainPanel);
JPanel buttonPanel = new JPanel(new GridLayout(3, 4));
mainPanel.add(buttonPanel, BorderLayout.CENTER);
mainPanel.add(keyField, BorderLayout.NORTH);
mainPanel.add(bequal, BorderLayout.SOUTH);
bequal.addActionListener(this);
bC.addActionListener(this);
bdivison.addActionListener(this);
badd.addActionListener(this);
bsubtract.addActionListener(this);
btimes.addActionListener(this);
// Use loop to build each of the button
for (int i = 0; i < NUMBERS; i++) {
// Construct key from labels in array
keys[i] = new JButton(labels[i]);
// Add actionlistener and add to button panel
keys[i].addActionListener(this);
buttonPanel.add(keys[i]);
buttonPanel.add(bdivison);
buttonPanel.add(badd);
buttonPanel.add(btimes);
buttonPanel.add(bC);
buttonPanel.add(bsubtract);
}
setSize(200, 250);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void actionPerformed(ActionEvent e) {
for (int i = 0; i < NUMBERS; i++) {
if (e.getSource() == keys[i]) {
// Now that we know which key was pressed, get the
// appropriate string from the array and append to the
// contents of the textfield
keyField.setText(keyField.getText()+labels[i]);
}
if(e.getSource() == bC){
// clear button pressed
keyField.setText("");
}
if(e.getSource()== bequal){
// first = keyField.getText();
// second = Integer.parseInt(keyField.getText());
second = Integer.parseInt(keyField.getText());
// calcObject.Equal(second, first, what);
// calcObject.Equal(second, first, what);
// keyField.setText(calcObject.Answer());
keyField.setText(String.valueOf(calcObject.Equal(second, first, what)));
// keyField.setText(calcObject.Equal(second, first, what));
}
if(e.getSource()== bdivison){
//first = Integer.parseInt(keyField.getText());
first = Integer.parseInt(keyField.getText());
what = "Divison";
keyField.setText("");
}
if(e.getSource()== badd){
// first = Integer.parseInt(keyField.getText());
// first = keyField.getText();
what = "Add";
first = Integer.parseInt(keyField.getText());
keyField.setText("");
}
if(e.getSource()== bsubtract){
// first = Integer.parseInt(keyField.getText());
first = Integer.parseInt(keyField.getText());
what = "Subtract";
keyField.setText("");
}
if(e.getSource()== btimes){
// first = Integer.parseInt(keyField.getText());
first = Integer.parseInt(keyField.getText());
what = "Times";
keyField.setText("");
}
}
}
public static void main(String[] args) {
Calculator s = new Calculator();
}
这是另一个
int answernum;
public String answer;
public String a1;
int Equal(int second, int first, String what) {
if(what.equals("Add")){
answernum = first+second;
// answer = Integer.toString(answernum);
}
if(what.equals("Subtract")){
answernum = first - second;
// answer = Integer.toString(answernum);
}
if(what.equals("Division")){
answernum = first / second;
// answer = Integer.toString(answernum);
}
if(what.equals("Times")){
answernum = first * second;
// answer =Integer.toString(answernum);
}
return answernum;
}