与applet交互时，JTextArea会变黑吗？

Question

出于某种原因，如果突出显示文本区域文本背景变黑，因此文本不可读，当我选择底部的单选按钮时（参见附图），整个文本区域再次变黑，再次使文字不可读！任何人都知道它为什么这样做？

这是我的文字区域的代码......

        //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并不了解透明色。相反，您必须使用setOpaque并将其传递给false

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

对于example，您也可以使用JLabel包含在HTML中的JLabel文本。默认情况下，{{1}}是透明的