我正在编码选择排序可视化。所以，我遇到了一个问题：当我更改面板时（当我在主菜单中并按下按钮进行可视化时）我希望我的数组被绘制在面板上，但它没有发生。 我不知道在更换面板或绘制阵列时出现什么问题 我是java的新手，所以我希望你能帮助我！ 代码：
Main.java
import project.MainMenu;
public class Main {
public static void main(String[] args) {
new MainMenu();
}
}
MainMenu.java
package project;
import java.awt.*;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.border.Border;
import javax.swing.border.EmptyBorder;
public class MainMenu extends JFrame {
private static final long serialVersionUID = 1L;
private JPanel panel;
private JFrame frame;
private JLabel label;
private JButton vizualiseButton;
private JLabel description;
Dimension screen;
public MainMenu() {
frame = new JFrame();
panel = new JPanel();
GridLayout layout = new GridLayout(0, 1);
layout.setVgap(10);
panel.setLayout(layout);
panel.setBorder(new EmptyBorder(10,10,10,10));
label = new JLabel("Сортировка выбором");
label.setFont(label.getFont().deriveFont(36.0f));
label.setHorizontalAlignment(getX());
label.setPreferredSize(getPreferredSize());
description = new JLabel("");
description.setFont(label.getFont().deriveFont(20.0f));
description.setPreferredSize(getPreferredSize());
description.setText("<html><span>Описание какое-то сортировки</span></html>");
vizualiseButton = new JButton("Посмотреть визуализацию");
vizualiseButton.addMouseListener(new java.awt.event.MouseAdapter() {
boolean clicked = false;
public void mouseEntered(java.awt.event.MouseEvent evt) {
vizualiseButton.setBackground(new Color(155, 239, 245));
}
public void mouseExited(java.awt.event.MouseEvent evt) {
if (!clicked)
vizualiseButton.setBackground(new Color(255,255,255));
}
/// Changing panels. This might be an issue
public void mousePressed(java.awt.event.MouseEvent evt) {
clicked = true;
frame.add(new Sorting());
panel.setVisible(false);
}
});
JPanel buttonPanel = new JPanel();
buttonPanel.setSize(50,40);
buttonPanel.add(vizualiseButton, BorderLayout.CENTER);
panel.add(label, BorderLayout.NORTH);
panel.add(description, BorderLayout.CENTER);
panel.add(buttonPanel, BorderLayout.SOUTH);
screen = Toolkit.getDefaultToolkit().getScreenSize();
frame.setLayout(new BorderLayout());
frame.add(panel, BorderLayout.CENTER);
frame.setExtendedState(Frame.MAXIMIZED_BOTH);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setTitle("Сортировка выбором");
frame.setVisible(true);
}
}
Sorting.java
package project;
import javax.swing.*;
public class Sorting extends JPanel {
private JPanel buttonPanel;
private JButton addNum;
private JButton startVisualizing;
private JButton resetArray;
private int x = 15;
private int[] arr;
private int y = 15;
public Sorting(){
arr = new int[]{1,2,3};
/// array visualization
add(new ArrayVis(arr,x,y));
x += 10 * arr.length;
setVisible(true);
}
public void selectionSort() {
for (int i = 0; i < arr.length; i++) {
int min = i;
for (int j = i + 1; j < arr.length; j++) {
if (arr[j] < arr[min]) {
min = j;
}
}
int helper = arr[i];
arr[i] = arr[min];
arr[min] = helper;
}
}
}
ArrayVis.java
package project;
import javax.swing.*;
import java.awt.*;
public class ArrayVis extends JPanel {
private int[] arr;
private int x;
private int y;
public ArrayVis(int[] arr,int x, int y){
this.arr = arr;
this.x = x;
this.y = y;
setVisible(true);
}
@Override
public void paintComponent(Graphics g){
super.paintComponent(g);
for (int i = 0;i<arr.length;i++){
g.drawString(Integer.toString(arr[i]),x,y);
x += 10;
g.fillRect(20,20,30,30);
}
}
}