与小程序交互时 JTextArea 变黑？

Question

出于某种原因，如果您突出显示文本区域文本，背景会变成黑色，从而使文本不可读，同样当我 select 底部的单选按钮（见附图）时，整个文本然后区域变黑，再次使文本不可读！有人知道为什么要这样做吗？

这是我的文本区域的代码...

        //Text area that displays the games instructions
    textAreaInstructions = new JTextArea(
        "To play choose your difficulty and then click start. \n\n" +
        "The aim of the game is to select the 'golden' rectangle, you will be presented with 4 \n" +
        "rectangles and you must choose one that has height and width proportions that represent \n" +
        "the golden ratio: 1.618. If you're not too sure what a golden rectangle looks like it's \n" +
        "best you start on beginner until you get the hang of it! \n\n" +
        "For every correctly identified golden rectangle you score 1 piece of 'Gold', however if you \n" +
        "incorrectly identify a golden rectangle, 1 piece of 'Gold' will be taken away from your \n" +
        "score. Remember, you only have 30 seconds, so collect as much 'Gold' as you can, good luck! \n"); 
    c.add (textAreaInstructions);
    textAreaInstructions.setBounds(130, 110, 600, 200);
    textAreaInstructions.setEditable(false);
    textAreaInstructions.setBackground( new Color(0, 0, 0, 0) ); //Transparrent background to text area

Answer 1

Swing 不理解透明颜色。相反，您必须使用 setOpaque 并传递它 false

textAreaInstructions.setEditable(false);
//textAreaInstructions.setBackground( new Color(0, 0, 0, 0) );
textAreaInstructions.setOpaque(false);

对于 example，您也可以将 JLabel 的文本用 HTML 包裹起来。 JLabel默认透明

与小程序交互时 JTextArea 变黑？

JTextArea goes black when interacting with applet?

java

swing

bluej