弹出JAVA消息

//我想添加消息弹出窗口，如果你是对的，它表明你的答案是正确的，恭喜

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//如果出现错误，则表明您的答案不正确。请重试

您可以通过显示警报对话框来执行此操作，请查看以下内容：

if(answers[index] != 'A')
        answer_labelA.setForeground(new Color(255,0,0)); //It shows if the button that you choose is correct, the button become color green and wrong become color red
    if(answers[index] != 'B')
        answer_labelB.setForeground(new Color(255,0,0)); //It shows if the button that you choose is correct, the button become color green and wrong become color red
    if(answers[index] != 'C')
        answer_labelC.setForeground(new Color(255,0,0)); //It shows if the button that you choose is correct, the button become color green and wrong become color red
    if(answers[index] != 'D')
        answer_labelD.setForeground(new Color(255,0,0)); //It shows if the button that you choose is correct, the button become color green and wrong become color red