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我不能让我的数字按钮附加自己,可以说如果我想输入11,它将无法工作,它只在文本字段中显示1。它不会让我按另一个数字按钮,并将其附加到文本字段中的1或任何数字。它只是停止并等待,直到我按下一个按钮,操作计算器:我无法让我的号码在JTextField中重复
private ActionListener NumberTapped = new ActionListener() {
@Override
public void actionPerformed (ActionEvent e) {
// JOptionPane.showMessageDialog(null, "Number tapped");
JButton src = (JButton) e.getSource();
String numberSelected = "";
if (src.equals(btn0))
numberSelected = "0";
else if (src.equals(btn1))
numberSelected = "1";
else if (src.equals(btn2))
numberSelected = "2";
else if (src.equals(btn3))
numberSelected = "3";
else if (src.equals(btn4))
numberSelected = "4";
else if (src.equals(btn5))
numberSelected = "5";
else if (src.equals(btn6))
numberSelected = "6";
else if (src.equals(btn7))
numberSelected = "7";
else if (src.equals(btn8))
numberSelected = "8";
else if (src.equals(btn9))
numberSelected = "9";
else if (src.equals(btnA))
numberSelected = "1010";
else if (src.equals(btnB))
numberSelected = "1011";
else if (src.equals(btnC))
numberSelected = "1100";
else if (src.equals(btnD))
numberSelected = "1101";
else if (src.equals(btnE))
numberSelected = "1110";
else if (src.equals(btnF))
numberSelected = "1111";
if (operator.equals("") && operand1.equals("")) {
operand1 = operand1 + numberSelected;
outputField.setText(operand1);
} else if (!operator.equals("")) {//else if the operator has been set, then append the number onto operand2
operand2 = operand2 + numberSelected;
outputField.setText(operand2);
}
}
};
1)为了更好地提供帮助,请发布[MCVE]或[简短,独立,正确的示例](http://www.sscce.org/)。 2)另请参阅此工作[计算器示例](http://stackoverflow.com/a/7441804/418556)。它使用'ScriptEngine'来评估文本字段中的表达式。 –
什么是“运营商”,“运营商1”和“运营商2”。运营商是空的,但operator1不是? –