java - 在Java中，如何使数组中的每个元素成为一个按钮？

Question

对于我的 CS 项目，我正在做一个多项选择测验。每个测验都有一个问题和四个可能的答案。正确答案保存为字符串。所有错误的答案都保存在一个字符串数组中。我想为每个按钮制作一个按钮。但是我不想让正确答案一直在同一个位置，所以我想随机放置。乱放之后不知道怎么给字符串数组做按钮。帮助!

` 公共(public)显示(){

    answer1 = new JButton("1");
    answer2 = new JButton("2");
    answer3 = new JButton("3");
    answer4 = new JButton("");
    question = new JLabel ("question?");
}

public Display(String question1, String [] answers, String correct, String pictureName){
    //create a panel to hold buttons

    SimplePicture background = new SimplePicture(pictureName);
    JLabel picture = background.getJLabel();

    question = new JLabel(question1);

    //assign answers to buttons

    //generate a random number to determine where correct goes
    int index = (int)(Math.random()*4);

    //place correct answer in a certain button
    if (index == 0){
        answer1 = new JButton(correct);
    }
    else if (index == 1){
        answer2 = new JButton(correct);
    }
    else if (index == 2){
        answer3 = new JButton(correct);
    }
    else if (index == 3){
        answer4 = new JButton(correct);
    }

    //fill other spots with answers
    for (int i=0; i < answers.length; i++){
        this is where I need help

        }
    }`

Answer 1

编辑

现在回答你的问题:

因为您事先知道有多少个按钮，您可以简单地使用一个数组。

JButton[] buttons;

buttons = new JButton[4] // or new JButton[answers.length] if you ever 
                         // want to increase the amount of answers.

//assign answers to buttons

//generate a random number to determine where correct goes
int index = (int)(Math.random() * 4);

//put the correct answer to the random button:
buttons[index] = new JButton(correct)

//fill other spots with answers
for (int i = 1; i <= answers.length; i++) {
    buttons[(index + i) % answers.length] = new JButton(answers[i - 1]);
}

那么如果您不知道 % 是 java 中的模数运算符，它会做什么。因此，如果 (index + i) 超过 3(假设 answers.length 为 3)，它将再次变为 0，因此您不会得到 IndexOutOfBoundsException.

希望这对您有所帮助。