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我目前被困在一些程序上，我确定有办法做到这一点，但就是想不到，所以就这样吧。所以我正在使用 Eclipse 窗口查看器，并根据我的需要制作了一个 GUI，我得到了一个 Ccombo，其中有几个选项可供选择，我想要做的是单击按钮时我希望程序能够看到他们选择了什么，然后根据他们选择的内容，将不同的结果放入另一个文本字段

OptionsOptimizer = new Shell();
    OptionsOptimizer.setSize(450, 340);
    OptionsOptimizer.setText("Options Optimizer");

    Label lblSpread = new Label(OptionsOptimizer, SWT.NONE);
    lblSpread.setAlignment(SWT.CENTER);
    lblSpread.setBounds(10, 10, 213, 15);
    lblSpread.setText("Type Of Spread");

    CCombo combo = new CCombo(OptionsOptimizer, SWT.BORDER);
    combo.setItems(new String[] {"Put Credit Spread", "Short Naked Put", "Put Broken Wing Butterfly", "Custom Naked Put", "Call Debit Spread", "Call Calander", "Call Ratio Backspread", "Put Diagonal", "Short Straddle", "Short Strangle", "Short Iron Condor", "Short Iron Butterfle"});
    combo.setBounds(10, 31, 213, 21);

     Button Enter = new Button(OptionsOptimizer, SWT.NONE);
     Enter.addMouseListener(new MouseAdapter() {
        public void mouseDoubleClick(MouseEvent e) {
            double profit = Double.parseDouble(Profit.getText());
            double margin = Double.parseDouble(Margin.getText());
            double roi = profit/margin;
            double roundroi = Math.round(roi*10000)/100.0;
            ROI.setText("Your return on investment is " + roundroi + "%");
            double percent = Double.parseDouble(ITM.getText());
            double OTM = ((100 - percent)/100);
            int day = Integer.parseInt(Days.getText());
            double roc = (roi/day)*OTM;
            double roundroc = Math.round(roc*10000)/100.0;
            ROC.setText("Your return on capital per day is " + roundroc + "%");
            double annual = roc*365*.4;
            double roundannual = Math.round(annual*10000)/100.0;
            Annual.setText("Your annual return is " + roundannual + "% if you invested 40% of your total equity");

            Point spread = combo.getSelection();
                if(spread.toString() == "Put Credit Spread")
                {
                    Volitility.setText("A fall in implied volitility will help your position");
                }   
    });

    Enter.setBounds(159, 108, 75, 25);
    Enter.setText("Evaluate");

}
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1 回答 1

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我可以看到您的代码存在一个问题：您正在使用 比较 Button 的文本==，但您应该使用spread.toString().equals("Put Credit Spread").

请参阅如何比较 Java 中的字符串？了解更多信息。

作为一点建议：CCombo 有一个getSelectionIndex函数，它返回从 开始的选定项目的整数值0，或者-1如果没有选择项目。使用此功能的好处是能够更改项目文本而无需更改逻辑。

于 2016-12-16T17:15:52.763 回答