我的兩個類如何共享相同的JFrame或Frame？
[英]How could my two classes share the same JFrame or Frame?
問題描述
好了，所以我的第一堂課創建了Frame並在其中放置了一個紅色矩形，我可以移動它。 現在我正在做的是為藍色矩形創建另一個類。 現在，我嘗試創建第二類，並將第一類擴展到該類。 這似乎沒有做的工作。
Summery： 我需要怎么做才能使它們共享同一幀？ 有辦法嗎？
解決的版本 我的代碼（頭等艙）：已 編輯
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
public class MyGame extends JPanel implements ActionListener, KeyListener {
Timer t = new Timer(5, this);
int x = 0, y = 0, velx =0, vely =0, g = 0;
private Color color;
public MyGame() {
t.start();
addKeyListener(this);
setFocusable(true);
setFocusTraversalKeysEnabled(false);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(400, 400);
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(color);
g.fillRect(x, y, 50, 30);
}
@Override
public void actionPerformed(ActionEvent e) {
if (x < 0) //stops us from going backwards past x = 0
{
velx = 0;
x = 0;
}
if (y < 0) //stops us from going to the sky
{
vely = 0;
y = 0;
}
if (y > 330) // stops us from going through the ground
{
vely = 0;
y = 330;
}
x += velx;
y += vely;
repaint();
}
@Override
public void keyPressed(KeyEvent e) {
int code = e.getKeyCode();
{
if (code == KeyEvent.VK_DOWN) {
vely = 1; // removing velx = 0 allows us to go vertically and horizontlly at the same time
}
if (code == KeyEvent.VK_UP) {
vely = -1; // same goes for here
}
if (code == KeyEvent.VK_LEFT) {
velx = -1;
}
{
if (code == KeyEvent.VK_RIGHT) {
velx = 1;
}
}
}
}
@Override
public void keyTyped(KeyEvent e) {
}
@Override
public void keyReleased(KeyEvent e) {
velx = 0;
vely = 0;
}
public static void main (String arge[]){
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new Incoming());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
（第二類）：已編輯
import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
public class Incoming extends MyGame {
private Color color;
int x = 0, y = 0, velx = 0, vely = 0;
public Incoming() {
color = Color.BLUE;
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(color);
g.fillRect(x, y, 50, 30);
}
@Override
public void actionPerformed(ActionEvent e) {
super.actionPerformed(e);
if (x < 0) //stops us from going backwards past x = 0
{
velx = 0;
x = 0;
}
if (y < 0) //stops us from going to the sky
{
vely = 0;
y = 0;
}
if (y > 330) // stops us from going through the ground
{
vely = 0;
y = 330;
}
x += velx;
y += vely;
repaint();
}
@Override
public void keyPressed(KeyEvent e) {
super.keyPressed(e);
int code = e.getKeyCode();
{
if (code == KeyEvent.VK_S) {
vely = 1; // removing velx = 0 allows us to go vertically and horizontlly at the same time
}
if (code == KeyEvent.VK_NUMPAD8) {
vely = -1; // same goes for here
}
if (code == KeyEvent.VK_NUMPAD4) {
vely = 0;
velx = -1;
}
{
if (code == KeyEvent.VK_NUMPAD6) {
vely = 0;
velx = 1;
}
}
}
}
@Override
public void keyReleased(KeyEvent e) {
super.keyReleased(e);
velx = 0;
vely = 0;
}
}
謝謝
2 個解決方案
解決方案1
1 已采納 2014-05-15 01:21:01
您可以利用組件的顏色屬性支持，也可以提供自己的顏色屬性，可以通過使用setter和getter進行設置和檢索
以下示例僅使用組件現有的foreground屬性...
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import javax.swing.AbstractAction;
import javax.swing.ActionMap;
import javax.swing.InputMap;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class GameExample {
public static void main(String[] args) {
new GameExample();
}
public GameExample() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
MyGame game = new MyGame();
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(game);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class MyGame extends JPanel implements ActionListener {
Timer t = new Timer(5, this);
int x = 0, y = 0, velx = 0, vely = 0, g = 0;
public MyGame() {
t.start();
setFocusTraversalKeysEnabled(false);
setForeground(Color.RED);
InputMap im = getInputMap(WHEN_IN_FOCUSED_WINDOW);
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_UP, 0, false), "up-pressed");
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_DOWN, 0, false), "down-pressed");
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_LEFT, 0, false), "left-pressed");
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT, 0, false), "right-pressed");
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_UP, 0, true), "up-released");
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_DOWN, 0, true), "down-released");
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_LEFT, 0, true), "left-released");
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT, 0, true), "right-released");
ActionMap am = getActionMap();
am.put("up-pressed", new YDelatAction(-1));
am.put("down-pressed", new YDelatAction(1));
am.put("left-pressed", new XDelatAction(-1));
am.put("right-pressed", new XDelatAction(1));
am.put("up-released", new YDelatAction(0));
am.put("down-released", new YDelatAction(0));
am.put("left-released", new XDelatAction(0));
am.put("right-released", new XDelatAction(0));
}
@Override
public Dimension getPreferredSize() {
return new Dimension(400, 400);
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(getForeground());
g.fillRect(x, y, 50, 30);
}
@Override
public void actionPerformed(ActionEvent e) {
if (x < 0) //stops us from going backwards past x = 0
{
velx = 0;
x = 0;
}
if (y < 0) //stops us from going to the sky
{
vely = 0;
y = 0;
}
if (y > 330) // stops us from going through the ground
{
vely = 0;
y = 330;
}
x += velx;
y += vely;
repaint();
}
public class XDelatAction extends AbstractAction {
private int value;
public XDelatAction(int value) {
this.value = value;
}
@Override
public void actionPerformed(ActionEvent e) {
vely = 0;
velx = value;
}
}
public class YDelatAction extends AbstractAction {
private int value;
public YDelatAction(int value) {
this.value = value;
}
@Override
public void actionPerformed(ActionEvent e) {
vely = value;
}
}
}
}
這將允許您通過執行以下操作來創建使用不同顏色的新實例：
MyGame game = new MyGame();
game.setForeground(Color.BLUE);
或者您可以使用類似...的方法來創建新的子類。
public class MyBlueGame extends MyGame {
public MyBlueGame () {
setForeground(Color.BLUE);
}
}
一般而言，您應該比KeyListener更喜歡鍵綁定API ，因為它可以更好地控制生成鍵事件所需的焦點級別，並且通常會產生更多可重用和可配置的代碼（IMHO）
更新
因此，根據您的示例代碼...
每個類都需要自己的color屬性，該屬性獨立於另一個屬性，否則繼承將成為障礙（父類將使用子類的值）
您還需要更改子類的keyPressed和keyReleased方法，以便兩個矩形可以彼此獨立移動。
這不是我的首選解決方案。 我將擁有一個單一的游戲界面，該界面能夠呈現整個游戲（所有實體）的狀態，並提供一種可以從表面上添加（或可能從中移除）游戲元素的方式以及一種能夠就能控制這些元素的更新方式...但這就是我...
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class GameTest {
public static void main(String[] args) {
new GameTest();
}
public GameTest() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new Incoming());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class MyGame extends JPanel implements ActionListener, KeyListener {
Timer t = new Timer(5, this);
int x = 0, y = 0, velx = 0, vely = 0, g = 0;
private Color color;
public MyGame() {
color = Color.RED;
t.start();
addKeyListener(this);
setFocusable(true);
setFocusTraversalKeysEnabled(false);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(400, 400);
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(color);
g.fillRect(x, y, 50, 30);
}
@Override
public void actionPerformed(ActionEvent e) {
if (x < 0) //stops us from going backwards past x = 0
{
velx = 0;
x = 0;
}
if (y < 0) //stops us from going to the sky
{
vely = 0;
y = 0;
}
if (y > 330) // stops us from going through the ground
{
vely = 0;
y = 330;
}
x += velx;
y += vely;
repaint();
}
@Override
public void keyPressed(KeyEvent e) {
int code = e.getKeyCode();
{
if (code == KeyEvent.VK_DOWN) {
vely = 1; // removing velx = 0 allows us to go vertically and horizontlly at the same time
}
if (code == KeyEvent.VK_UP) {
vely = -1; // same goes for here
}
if (code == KeyEvent.VK_LEFT) {
velx = -1;
}
{
if (code == KeyEvent.VK_RIGHT) {
velx = 1;
}
}
}
}
@Override
public void keyTyped(KeyEvent e) {
}
@Override
public void keyReleased(KeyEvent e) {
velx = 0;
vely = 0;
}
}
public class Incoming extends MyGame {
private Color color;
int x = 0, y = 0, velx = 0, vely = 0;
public Incoming() {
color = Color.BLUE;
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(color);
g.fillRect(x, y, 50, 30);
}
@Override
public void actionPerformed(ActionEvent e) {
super.actionPerformed(e);
if (x < 0) //stops us from going backwards past x = 0
{
velx = 0;
x = 0;
}
if (y < 0) //stops us from going to the sky
{
vely = 0;
y = 0;
}
if (y > 330) // stops us from going through the ground
{
vely = 0;
y = 330;
}
x += velx;
y += vely;
repaint();
}
@Override
public void keyPressed(KeyEvent e) {
super.keyPressed(e);
int code = e.getKeyCode();
{
if (code == KeyEvent.VK_NUMPAD2) {
vely = 1; // removing velx = 0 allows us to go vertically and horizontlly at the same time
}
if (code == KeyEvent.VK_NUMPAD8) {
vely = -1; // same goes for here
}
if (code == KeyEvent.VK_NUMPAD4) {
vely = 0;
velx = -1;
}
{
if (code == KeyEvent.VK_NUMPAD6) {
vely = 0;
velx = 1;
}
}
}
}
@Override
public void keyReleased(KeyEvent e) {
super.keyReleased(e);
velx = 0;
vely = 0;
}
}
}
解決方案2
0 2014-05-15 01:01:46
我認為您要做的就是將顏色設置為類MyGame的參數，從而為您的類添加字段顏色。
private Color colour;
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(Colour);
g.fillRect(x,y,70,40);
}
JFrame f = new JFrame();
MyGame s = new MyGame();
s.setCoulor(Color.RED) // s.setCoulor(Color.BLUE)
f.add(s);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(600,400);
f.setVisible(true);
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