我想清理我的代码，我想知道是否可以将这些JLabels放入ArrayList。
这将用于do-while循环，其中将检查我的播放器的冲突。
以下是GamePane课程。此代码中包含移动播放器，并具有冲突代码。这是我创建ArrayList：
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
/**
* This class Holds the game pane that has the moving player. It also contains
* the GamePane
*
* @author 602052004
*
*/
public class GamePane extends JPanel implements ActionListener, KeyListener {// *change GamePane to GamePane
// This is were the game screen is made and the player is created.
private static final long serialVersionUID = 1L;
JLabel player = new JLabel();
JLabel finish = new JLabel();
// This is were the JLabels for the walls are created
//JLabel wall1 = new JLabel();
//ArrayList<JLabel> array = new ArrayList<>();
ArrayList<JLabel> array = new ArrayList<>();
array.add(wall1);
JLabel wall1 = new JLabel();
JLabel wall2 = new JLabel();
JLabel wall3 = new JLabel();
JLabel wall4 = new JLabel();
JLabel wall5 = new JLabel();
JLabel wall6 = new JLabel();
JLabel wall7 = new JLabel();
JLabel wall8 = new JLabel();
JLabel wall9 = new JLabel();
JLabel wall10 = new JLabel();
JLabel wall11 = new JLabel();
JLabel wall12 = new JLabel();
JLabel wall13 = new JLabel();
JLabel wall14 = new JLabel();
JLabel wall15 = new JLabel();
JLabel wall16 = new JLabel();
JLabel wall17 = new JLabel();
JLabel wall18 = new JLabel();
JLabel wall19 = new JLabel();
JLabel wall20 = new JLabel();
JLabel wall21 = new JLabel();
JLabel wall22 = new JLabel();
JLabel wall23 = new JLabel();
JLabel wall24 = new JLabel();
int playerSpeed = 5;
int FPS = 40;
private final Set<Integer> keys = new HashSet<>();
// The keys set holds the keys being pressed
public static void main(String[] args) {
// Open the GUI window
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
// Create a new object and
// run its go() method
new GamePane().go();
}
});
}
GamePane() {
// Run the parent class constructor
super();
// Allow the panel to get focus
setFocusable(true);
// Don't let keys change the focus
}
/**
* The frame that shows my game. It contains the game frame which holds my
* JPanel GameStage and ButtonPane.
*/
protected void go() {
setLayout(new CardLayout());
// Setup the window
JFrame GameFrame = new JFrame();
// Add this panel to the window
GameFrame.setLayout(new CardLayout());
GameFrame.add(this, "main");
GameFrame.setContentPane(this);
// Set's the window properties
GameFrame.setTitle("main");
GameFrame.setSize(800, 600);
GameFrame.setLocationRelativeTo(null);
GameFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
GameFrame.setVisible(true);
GameFrame.add(new ButtonPane(GameFrame), "buttons");
// Creates the new JPanel that will hold the game.
JPanel gamestage = new JPanel();
gamestage.setBackground(Color.darkGray);
GameFrame.add(gamestage, "game");
gamestage.setLayout(null);
// *Move the setup of the player and the timer under the walls
// Get a sample of collisions going so that i can do it over the weekend
// Setup the movable box
player.setBounds(25, 25, 20, 20);
player.setVisible(true);
player.setBackground(Color.cyan);
// Opaque makes the background visible
player.setOpaque(true);
// Setup the key listener
addKeyListener(this);
// Null layout allows moving objects!!!
gamestage.add(player);
// Set the timer
Timer tm = new Timer(1000 / FPS, this);
tm.start();
wall1.setBounds(10, 15, 10, 480);
wall1.setVisible(true);
wall1.setBackground(Color.white);
wall1.setOpaque(true);
gamestage.add(wall1);
wall2.setBounds(10, 10, 755, 10);
wall2.setVisible(true);
wall2.setBackground(Color.white);
wall2.setOpaque(true);
gamestage.add(wall2);
// wall3.setBounds(x, y, width, height);
wall3.setBounds(10, 100, 100, 10);
wall3.setVisible(true);
wall3.setBackground(Color.white);
wall3.setOpaque(true);
gamestage.add(wall3);
wall4.setBounds(100, 60, 10, 40);
wall4.setVisible(true);
wall4.setBackground(Color.white);
wall4.setOpaque(true);
gamestage.add(wall4);
wall5.setBounds(70, 60, 35, 10);
wall5.setVisible(true);
wall5.setBackground(Color.white);
wall5.setOpaque(true);
gamestage.add(wall5);
wall6.setBounds(60, 100, 10, 90);
wall6.setVisible(true);
wall6.setBackground(Color.white);
wall6.setOpaque(true);
gamestage.add(wall6);
wall7.setBounds(10, 230, 60, 10);
wall7.setVisible(true);
wall7.setBackground(Color.white);
wall7.setOpaque(true);
gamestage.add(wall7);
wall8.setBounds(60, 230, 10, 65);
wall8.setVisible(true);
wall8.setBackground(Color.white);
wall8.setOpaque(true);
gamestage.add(wall8);
wall9.setBounds(60, 290, 125, 10);
wall9.setVisible(true);
wall9.setBackground(Color.white);
wall9.setOpaque(true);
gamestage.add(wall9);
wall10.setBounds(175, 300, 10, 45);
wall10.setVisible(true);
wall10.setBackground(Color.white);
wall10.setOpaque(true);
gamestage.add(wall10);
wall11.setBounds(130, 335, 45, 10);
wall11.setVisible(true);
wall11.setBackground(Color.white);
wall11.setOpaque(true);
gamestage.add(wall11);
wall12.setBounds(10, 335, 70, 10);
wall12.setVisible(true);
wall12.setBackground(Color.white);
wall12.setOpaque(true);
gamestage.add(wall12);
wall13.setBounds(10, 435, 60, 10);
wall13.setVisible(true);
wall13.setBackground(Color.white);
wall13.setOpaque(true);
gamestage.add(wall13);
wall14.setBounds(10, 385, 230, 10);
wall14.setVisible(true);
wall14.setBackground(Color.white);
wall14.setOpaque(true);
gamestage.add(wall14);
wall15.setBounds(60, 390, 10, 50);
wall15.setVisible(true);
wall15.setBackground(Color.white);
wall15.setOpaque(true);
gamestage.add(wall15);
wall16.setBounds(230, 290, 10, 155);
wall16.setVisible(true);
wall16.setBackground(Color.white);
wall16.setOpaque(true);
gamestage.add(wall16);
wall17.setBounds(10, 485, 750, 10);
wall17.setVisible(true);
wall17.setBackground(Color.white);
wall17.setOpaque(true);
gamestage.add(wall17);
wall18.setBounds(70, 180, 60, 10);
wall18.setVisible(true);
wall18.setBackground(Color.white);
wall18.setOpaque(true);
gamestage.add(wall18);
wall19.setBounds(120, 180, 10, 55);
wall19.setVisible(true);
wall19.setBackground(Color.white);
wall19.setOpaque(true);
gamestage.add(wall19);
}
public boolean areColliding(JLabel a, JLabel b) {
return a.getBounds().intersects(b.getBounds());
}
/**
* this method makes the player move. It takes the players speed and subtracts
* or adds the player speed to the current position of the player. It also
* figures out were the player is at currently aswell.
*
* @param arg0
*/
@Override
public void actionPerformed(ActionEvent arg0) {
// Move up if W is pressed
if (keys.contains(KeyEvent.VK_W)) {
player.setLocation(player.getX(), player.getY() - playerSpeed);
}
// Move right if D is pressed
if (keys.contains(KeyEvent.VK_D)) {
player.setLocation(player.getX() + playerSpeed, player.getY());
}
// Move down if S is pressed
if (keys.contains(KeyEvent.VK_S)) {
player.setLocation(player.getX(), player.getY() + playerSpeed);
}
// Move left if A is pressed
if (keys.contains(KeyEvent.VK_A)) {
player.setLocation(player.getX() - playerSpeed, player.getY());
}
// Check for collisions
if (areColliding(wall1, player)) {
// Reposition the target
int newX = (int) (25);
int newY = (int) (25);
player.setLocation(newX, newY);
}else
// Check for collisions
if (areColliding(wall2, player)) {
// Reposition the target
int newX = (int) (25);
int newY = (int) (25);
player.setLocation(newX, newY);
}else
// Check for collisions
if (areColliding(wall3, player)) {
// Reposition the target
int newX = (int) (25);
int newY = (int) (25);
player.setLocation(newX, newY);
}
}
@Override
public void keyPressed(KeyEvent e) {
// Add the key to the list
// of pressed keys
if (!keys.contains(e.getKeyCode())) {
keys.add(e.getKeyCode());
}
}
@Override
public void keyReleased(KeyEvent e) {
// Remove the key from the
// list of pressed keys
keys.remove((Integer) e.getKeyCode());
}
@Override
public void keyTyped(KeyEvent e) {
}
}
以下是ButtonPane课程。它控制屏幕切换。切换的两个屏幕是GamePane和ButtonPane。 GamePane包含墙和运行游戏的所有代码。 ButtonPane类如下：
/**
* This pane contains the button and sets up the button pane
*/
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class ButtonPane extends JPanel {
private JButton startBTN;// Calls the JButton
JFrame game;
public ButtonPane(JFrame g) {
game = g;
setLayout(new GridBagLayout());
setBackground(Color.gray);// Sets the menu stages color blue
startBTN = new JButton("Start");// Creates a new button
add(startBTN);// Adds the button on the startStage
startBTN.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (game.getContentPane().getLayout() instanceof CardLayout) {
CardLayout layout = (CardLayout) getParent().getLayout();
layout.show(game.getContentPane(), "game");
}
}
});
}
}
答案 0 :(得分：0)
您可以在for循环中使用Object.keys(response[0]);初始化ArrayList，如下所示：
JLabel要从ArrayList<JLabel> array = new ArrayList<>();
for (int i = 0, i < numberOfLabels, i++)
{
array.add(new JLabel());
}
检索元素，只需使用：
ArrayList如果您想将已创建的array.get(elementIndex);
放入JLabels，您可以执行以下操作：
ArrayList对于array.add(labelObject);
中所需的每个JLabel对象。
答案 1 :(得分：0)
您可以使用ArrayList存储JLabel
但是在向你的arraylist添加一个已经存在的JLabel时你会很困难（因为，当你找回它时你不知道要访问哪个索引）。
跟踪JLabel的更好方法是创建地图，您经常需要为JLabel指定文字，以便用它来识别您的JLabel：< / p>
Map<String, JLabel> map = new HashMap<>();
map.put(your-label-name, new JLabel(your-label-name));
如果您知道您的标签将重复，请在JLabel密钥中添加前缀。