java - 将 ArrayList 类中的随机字符串打印到 JLabel 文本中

Question

我正在创建一个测验

我有一个类，其中包含 GUI 和用于放置在我的应用程序中提出的问题的位置的代码。下面的类将用于保存 JLabel 组件(以及其他 UI 元素)，并应显示提供给它的问题列表中的随机问题。我已将每个“问题列表”保存为另一个类中的 ArrayList 。

我知道您必须使用随机数生成器通过生成索引号从问题列表中选择一行，然后使用它从数组中检索一行以使用作为要在 JLabel

中显示的文本

但是，我不确定如何在实际代码中做到这一点，请任何人帮忙。

我的代码如下:

package ZillionaireGUI;

import java.awt.Frame;

import javax.swing.ButtonGroup;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JRadioButton;
import javax.swing.SwingUtilities;


public class questionDialog extends JDialog {
private JLabel Question;
private JRadioButton answerThree;
private JRadioButton answerFour;
private JRadioButton answerTwo;
private JRadioButton answerOne;
public questionDialog(Frame parent) {
    super(parent);
}


public questionDialog(JFrame frame) {
    super(frame);
    initGUI();
}

private void initGUI() {
    try {

        getContentPane().setLayout(null);

        Question = new JLabel();
        getContentPane().add(Question);
        Question.setText("jLabel1");
        Question.setBounds(39, 127, 383, 29);

        answerOne = new JRadioButton();
        getContentPane().add(answerOne);
        answerOne.setText("jRadioButton1");
        answerOne.setBounds(26, 183, 93, 20);

        answerTwo = new JRadioButton();
        getContentPane().add(answerTwo);
        answerTwo.setText("jRadioButton1");
        answerTwo.setBounds(130, 183, 93, 20);

        answerThree = new JRadioButton();
        getContentPane().add(answerThree);
        answerThree.setText("jRadioButton1");
        answerThree.setBounds(247, 183, 93, 20);

        answerFour = new JRadioButton();
        getContentPane().add(answerFour);
        answerFour.setText("jRadioButton1");
        answerFour.setBounds(360, 183, 93, 20);

        ButtonGroup group = new ButtonGroup();
        group.add(answerOne);
        group.add(answerTwo);
        group.add(answerThree);
        group.add(answerFour);


        this.setSize(490, 393);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

}

import java.util.*;
public class Questions {
public static void main(String[] args) {
    ArrayList<String> SPOquestions = new ArrayList<String>(); // adding the sports questions for the quiz

    SPOquestions.add("Who won the 2005 Formula One World Championship?");
    SPOquestions.add("Which team has the most Formula One Constructors titles?");
    SPOquestions.add("In what year did Roger Federer win his first 'Grand Slam'?");
    SPOquestions.add("How many 'Grand Slams' has Rafael Nadal won?");
    SPOquestions.add("Who has scored the most amount of goals in the Premier League?");
    SPOquestions.add("Who has won the most World Cups in football?");
    SPOquestions.add("How many MotoGP titles does Valentino Rossi hold?");
    SPOquestions.add("Who was the 2013 MotoGP champion?");
    SPOquestions.add("Who won the 2003 Rugby World Cup?");
    SPOquestions.add("In rugby league, how many points are awarded for a try?");
    SPOquestions.add("Who is the youngest ever snooker World Champion?");
    SPOquestions.add("In snooker, what is the highest maximum possible break?");
    SPOquestions.add("How many majors has Tiger Woods won?");
    SPOquestions.add("In golf, what is the tournament between the USA and Europe called?");
    SPOquestions.add("How many World Championships has darts player Phil Taylor won?");
    SPOquestions.add("What is the maximum possible amount of points a player can earn from throwing three darts?");
    SPOquestions.add("How many gold medals did Michael Phelps win at the 2008 Beijing Olympics?");
    SPOquestions.add("Who won the 2012 Olympic 100 metres mens race?");
    SPOquestions.add("Which of these events are not a part of the heptathlon?");
    SPOquestions.add("When was the first modern Olympics held?");

    ArrayList<String> MUSquestions = new ArrayList<String>(); // adding the music questions

    MUSquestions.add("'Slash' was a member of which US rock band?");
    MUSquestions.add("Brian May was a member of which English rock band?");
    MUSquestions.add("What is the name of the music festival held annually in the town of Boom, Belgium?");
    MUSquestions.add("The rapper Tupac Shakuer '2Pac' died in which year?");
    MUSquestions.add("Which of these bands headlined the 2013 Glastonbury music festival?");
    MUSquestions.add("Which of these people designed the 'Les Paul' series of guitars?");
    MUSquestions.add("Keith Moon was a drummer for which English rock band?");
    MUSquestions.add("Kanye West has a total of how many Grammy awards?");
    MUSquestions.add("Beyonce Knowles was formally a member of which US group?");
    MUSquestions.add("In which US city was rapper 'Biggie Smalls' born?");
    MUSquestions.add("Michael Jackson's first number one single in the UK as a solo artist was what?");
    MUSquestions.add("The best selling album of all time in the UK is what?");
    MUSquestions.add("The best selling album of all time in the US is what?");
    MUSquestions.add("What is the artist known as 'Tiesto's real name?");
    MUSquestions.add("Which of these was not a member of The Beatles?");

    ArrayList<String> GENquestions = new ArrayList<String>(); // adding general knowledge questions

    GENquestions.add("Who was the second President of the United States?");
    GENquestions.add("The youngest son of Bob Marley was who?");
    GENquestions.add("In the film '8 Mile', the character portrayed by Eminem is known as what?");
    GENquestions.add("What is the capital city of New Zealand?");
    GENquestions.add("What is the capital city of Australia?");
    GENquestions.add("How many millilitres are there in an English pint?");
    GENquestions.add("What was the biggest selling game for the PS2 worldwide?");
    GENquestions.add("What is the last letter of the Greek alphabet?");
    GENquestions.add("Who created the television series Futurama?");
    GENquestions.add("A word which reads the same backwards as it does forwards is known as a what?");
    GENquestions.add("A 'baker's dozen' consists of how many items?");
    GENquestions.add("World War 1 officially occured on which date?");
    GENquestions.add("'Trouble and strife' is cockney rhyming slang for what?");
    GENquestions.add("Who was the last Prime Minister to hail from the labour party in the UK?");
    GENquestions.add("WalMart is the parent company of which UK based supermarket chain?");




}

}

Answer 1

首先，您需要根据数组的大小生成一个随机数。从 Math.random() 获取 0.0 - 1.0 范围内的随机值，并将其乘以问题数组的大小(例如，MUSquestions.size()) ) - 这将为您提供数组中的随机索引。

然后。使用 ArrayList get 方法，传入索引，获取所需的字符串。