关于计算器的Bug, 为什么我的“=”操作会无效的呢？？ 望java同路人赐教！！

Question

本帖最后由 c09034120207 于 2011-05-08 15:17:52 编辑

Answer 1

bAdd.addActionListener(new setLabelText_ActionListener());
bDec.addActionListener(new setLabelText_ActionListener());
bMul.addActionListener(new setLabelText_ActionListener());
bDiv.addActionListener(new setLabelText_ActionListener());
bCal.addActionListener(new setLabelText_ActionListener());
按钮的监听器加错了吧应该用这个setOperator_ActionListener吧

Answer 2

能不能详细一点呢？？  我改为setOperator_ActionListener监听了   bAdd.addActionListener(new setOperator_ActionListener());
bDec.addActionListener(new setOperator_ActionListener());
bMul.addActionListener(new setOperator_ActionListener());
bDiv.addActionListener(new setOperator_ActionListener());
bCal.addActionListener(new setOperator_ActionListener());
但是运行时还是出现错误啊1！！   等于监听失败

Answer 3

报错如下：Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: empty String
at sun.misc.FloatingDecimal.readJavaFormatString(Unknown Source)
at java.lang.Double.parseDouble(Unknown Source)
at jisuanqi.Calculator.stringTodouble(Calculator.java:7)
at jisuanqi.Calculator.operate(Calculator.java:11)
at jisuanqi.Calculator.opAdd(Calculator.java:34)
at jisuanqi.CalaulatorGUI$setOperator_ActionListener.actionPerformed(CalaulatorGUI.java:150)
at java.awt.Button.processActionEvent(Unknown Source)为什么会这样？？

Answer 4

at jisuanqi.Calculator.stringTodouble(Calculator.java:7)
public String opAdd(String x){
operate(" ");
op=add;
return result;
}private void operate(String x)
{
double x1=stringTodouble(x);
double y=stringTodouble(result)