Question

如何将背景图像添加到我的JFrame中以及U应该在哪里添加代码？

import java.awt.*;
import java.awt.event.*;
import javax.swing.ImageIcon.*;
import javax.swing.*; //import java swing to use the Jframe etc

public class MathQuiz extends JFrame implements ActionListener
{

JCheckBox answer1 = new JCheckBox(); //checkbozx for answer 1
JCheckBox answer2 = new JCheckBox(); //checkbozx for answer 2
JCheckBox answer3 = new JCheckBox(); //checkbozx for answer 3
JTextArea textArea = new JTextArea();//text area for question
JButton exit = new JButton(); // button to exit quiz
JButton calculator = new JButton(); // button to open calculator
JLabel image = new JLabel(); //adds background image

// Some names which will be associated with numbers.
int answer;
int questionnumber;


/**
   * This bit of code starts the process of showing the window.
**/
public MathQuiz()
{
    // Drop down to the code labeled 'initComponents' below.

    try {
        initComponents();
    } catch (Exception e) {}

}


/**
 * This bit of code is the first bit that's run.
**/
static public void main(String[] args)
{
    MathQuiz frame = new MathQuiz(); 
    // The following code puts the Window on your screen.

    frame.setVisible(true); //allows the jframe to be visible
    frame.showQuestion(1);//shows the first question
    frame.setSize(370, 350);//sets the size of the frame

}

/**
 * This bit of code sets up how the Window looks.
**/
public void initComponents() throws Exception
{

编辑答案的复选框

    answer1.setSize(new Dimension(80, 20)); //set size of answer 1 checkbox
    answer1.setVisible(true); //sets visible to answer 1 checkbox
    answer1.setMaximumSize(new Dimension(80, 20)); 
    answer1.setMinimumSize(new Dimension(80, 20)); 
    answer1.setLocation(new Point(10, 180)); //set location answer 1 checkbox


    answer2.setSize(new Dimension(80, 20)); //set size of answer 2 checkbox
    answer2.setVisible(true);//sets visible to answer 2 checkbox
    answer2.setMaximumSize(new Dimension(80, 20));
    answer2.setMinimumSize(new Dimension(80, 20));
    answer2.setLocation(new Point(10, 210)); //set location answer 2 checkbox

    answer3.setSize(new Dimension(80, 20)); //set size of answer 3 checkbox
    answer3.setVisible(true);//sets visible to answer 3 checkbox
    answer3.setMaximumSize(new Dimension(80, 20));
    answer3.setMinimumSize(new Dimension(80, 20));
    answer3.setLocation(new Point(10, 240)); //set location answer 3 checkbox

编辑JFrame

上的文本区域的代码

    textArea.setSize(new Dimension(340, 80)); //set size of text ares
    textArea.setLineWrap(true); 
    textArea.setVisible(true); //sets visible to text area
    textArea.setMaximumSize(new Dimension(400, 140)); //set maximum size of text area
    textArea.setMinimumSize(new Dimension(400, 140)); //set minimum size of text area
    textArea.setLocation(new Point(10, 20)); //set location of text area
    textArea.setEditable(false);

编辑JFrame

上的退出按钮的代码

    exit.setSize(new Dimension(104, 40)); //set size of button
    exit.setVisible(true); //sets visible to button
    exit.setLocation(new Point(230, 180)); //set location of button
    exit.setText("Exit");

编辑JFrame

上的退出按钮的代码

    calculator.setSize(new Dimension(104, 40)); //set size of button
    calculator.setVisible(true); //sets visible to button
    calculator.setLocation(new Point(230, 230)); //set location of button
    calculator.setText("Calculator");

    image.setIcon(new ImageIcon("maths"));
    image.setVisible(true);

这将设置Window的大小并将swing实用程序添加到

    setSize(new Dimension(430, 292));
    setResizable(false);
    getContentPane().setLayout(null);
    setTitle("Multiple Choice Math Quiz!");
    setLocation(new Point(200, 200));
    getContentPane().add(answer1);
    getContentPane().add(answer2);
    getContentPane().add(answer3);
    getContentPane().add(textArea);
    getContentPane().add(exit);
    getContentPane().add(calculator);

Answer 1

您可以通过将图片添加到JLabel并依次添加到JFrame来正确执行此操作。

正如评论中所强调的，问题在于您使用的Null布局。

尝试其他layout manager。

如何将背景图像添加到jframe中

1 个答案: