Java 初始化JFrame窗口时出现黑屏
到现在为止,我觉得我已经尝试了一切。我正在努力 让这个简单的俄罗斯方块游戏运行,但即使我没有 除此之外,JFrame窗口仍然显示为黑色,带有一个小的 左上角的白色矩形 这是我已经尝试过的:Java 初始化JFrame窗口时出现黑屏,java,swing,jframe,Java,Swing,Jframe,到现在为止,我觉得我已经尝试了一切。我正在努力 让这个简单的俄罗斯方块游戏运行,但即使我没有 除此之外,JFrame窗口仍然显示为黑色,带有一个小的 左上角的白色矩形 这是我已经尝试过的: 使用f.setVisible(真)进行游戏;正如许多ppl建议的那样 检查可能的无限循环(将=+1更改为+=1) 还尝试包括://f.add(面板)//f、 包装() 我的代码: package fritol.sevela.java; import java.awt.Color; import java.a
//f.add(面板)//f、 包装()代码>
package fritol.sevela.java;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.ArrayList;
import java.util.Collections;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Tetris002 extends JPanel {
/**
*
*/
private static final long serialVersionUID = 1L;
/**
*
*/
private final Point[][][] myPoint= {
{
{new Point(0,1),new Point(1,1),new Point(2,1),new Point(3,1)},
{new Point(1,0),new Point(1,1),new Point(1,2),new Point(1,3)},
{new Point(0,1),new Point(1,1),new Point(2,1),new Point(3,1)},
{new Point(1,0),new Point(1,1),new Point(1,2),new Point(1,3)},
},
{
{new Point(0,1),new Point(1,1),new Point(2,1),new Point(2,0)},
{new Point(1,0),new Point(1,1),new Point(1,2),new Point(2,2)},
{new Point(0,1),new Point(1,1),new Point(2,1),new Point(0,1)},
{new Point(1,0),new Point(1,1),new Point(1,2),new Point(0,3)},
},
{
{new Point(0,1),new Point(1,1),new Point(2,1),new Point(2,0)},
{new Point(1,0),new Point(1,1),new Point(1,2),new Point(2,2)},
{new Point(0,1),new Point(1,1),new Point(2,1),new Point(0,0)},
{new Point(1,0),new Point(1,1),new Point(1,2),new Point(2,0)},
},
{
{new Point(0,0),new Point(0,1),new Point(1,0),new Point(1,1)},
{new Point(0,0),new Point(0,1),new Point(1,0),new Point(1,1)},
{new Point(0,0),new Point(0,1),new Point(1,0),new Point(1,1)},
{new Point(0,0),new Point(0,1),new Point(1,0),new Point(1,1)},
},
};
//Defining COLOURS
private final Color[] myColor= {Color.CYAN, Color.magenta,Color.orange,Color.yellow,Color.black,Color.pink,Color.red};
private Point pt;
private int currentPiece;
private int rotation;
private ArrayList<Integer> nextPiece=new ArrayList<Integer>();
private long score;
private Color[][] well;
private void init() {
well=new Color[12][24];
for(int i=0; i<12;i++) {
for(int j=0;j<23;j++) {
if(i==0||i==11||i==22) {
well[i][j]=Color.pink;
}else{
well[i][j]=Color.black;
}
}
}
newPiece();
}
public void newPiece() {
pt=new Point(5,2);
rotation=0;
if(nextPiece.isEmpty()) {
Collections.addAll(nextPiece, 0,1,2,3);
Collections.shuffle(nextPiece);
}
}
rotation.
private boolean collidesAt(int x, int y, int rotation) {
for(Point p: myPoint[currentPiece][rotation]) {
if(well[p.x+x][p.y+y]!=Color.black) {
return true;
}
}
return false;
}
private void rotate(int i) {
int newRotation=(rotation+i)%4;
if(newRotation<0) {
newRotation=3;
}
if(!collidesAt(pt.x,pt.y, newRotation)){
rotation=newRotation;
}
repaint(); //Some repaint function?
}
//move and move only??
public void move(int i) {
if(!collidesAt(pt.x,pt.y,rotation)) {
pt.x+=i;
}
repaint();
}
public void drop() {
if(!collidesAt(pt.x,pt.y,rotation)) {
pt.y+=1;
}else {
fixToWell();
}
repaint();
}
public void fixToWell() {
for(Point p: myPoint[currentPiece][rotation]) {
well[pt.x+p.x] [pt.y+p.y]=myColor[currentPiece];
}
clearRows();
newPiece();
}
public void deleteRow(int row) {
for(int j=row-1;j>0;j--) {
for (int i=1; i<11;i++){
well[i][j+1]=well[i][j];
}
}
}
//Now we will create Row
public void clearRows() {
boolean gap;
int numClear=0;
for(int j=21; j>0; j--) {
gap=false;
for(int i=1;i<11;i++) {
if(well[i][j]==Color.black) {
gap=true;
break;
}
}
if(!gap) {
deleteRow(numClear);
j+=1;
numClear+=1;
}
}
switch(numClear) { //score stuff
case 1:
score+=100;
break;
case 2:
score+=300;
break;
case 3:
score+=500;
break;
case 4:
score+=800;
break;
}
} //now we provide function to draw the piece //<>[]{}
private void drawPiece(Graphics g) {
g.setColor(myColor[currentPiece]);
for(Point p:myPoint[currentPiece][rotation]) {
g.fillRect((p.x+pt.x)*26,(pt.y+p.y)*26,25,25);
}
}
public void paintComponent(Graphics g) {
g.fillRect(0, 0, 26*12, 26*23);
for(int i=0; i<23;i++) {
for (int j=0;j<23;j++) {
g.setColor(well[i][j]);
g.fillRect(26*i,26*j, 25,25);
}
}
g.setColor(Color.WHITE);
g.drawString("Score:"+score, 19*12, 25);
drawPiece(g);
}
public static void main(String[] args) {
JFrame f=new JFrame("Tetris002");
//JPanel panel=new JPanel(); //Added by me
//f.setContentPane(panel); //added by me
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(12*26+10, 26*23+25);
//f.add(panel);
//f.pack();
f.setVisible(true);
final Tetris002 game=new Tetris002();
game.init();
f.add(game);
//Now Controls and Keys
f.addKeyListener(new KeyListener() {
@Override
public void keyTyped(KeyEvent e) {
}
public void keyReleased(KeyEvent e) {
}
public void keyPressed(KeyEvent e) {
switch(e.getKeyCode()) {
case KeyEvent.VK_UP:
game.rotate(-1);
break;
case KeyEvent.VK_DOWN:
game.rotate(+1);
break;
case KeyEvent.VK_LEFT:
game.move(-1);
break;
//case KeyEvent.VK_RIGHT:
//game.move(+1);
//break;
case KeyEvent.VK_SPACE:
game.drop();
game.score+=1;
break;
}
}
});
new Thread() {
public void run() {
while(true) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
game.drop();
}
}
}.start();
}
}
包fritol.sevela.java;
导入java.awt.Color;
导入java.awt.Graphics;
导入java.awt.Point;
导入java.awt.event.KeyEvent;
导入java.awt.event.KeyListener;
导入java.util.ArrayList;
导入java.util.Collections;
导入javax.swing.JFrame;
导入javax.swing.JPanel;
公共类Tetris002扩展了JPanel{
/**
*
*/
私有静态最终长serialVersionUID=1L;
/**
*
*/
私人终点[][]我的终点={
{
{新点(0,1),新点(1,1),新点(2,1),新点(3,1)},
{新点(1,0),新点(1,1),新点(1,2),新点(1,3)},
{新点(0,1),新点(1,1),新点(2,1),新点(3,1)},
{新点(1,0),新点(1,1),新点(1,2),新点(1,3)},
},
{
{新点(0,1),新点(1,1),新点(2,1),新点(2,0)},
{新点(1,0),新点(1,1),新点(1,2),新点(2,2)},
{新点(0,1),新点(1,1),新点(2,1),新点(0,1)},
{新点(1,0),新点(1,1),新点(1,2),新点(0,3)},
},
{
{新点(0,1),新点(1,1),新点(2,1),新点(2,0)},
{新点(1,0),新点(1,1),新点(1,2),新点(2,2)},
{新点(0,1),新点(1,1),新点(2,1),新点(0,0)},
{新点(1,0),新点(1,1),新点(1,2),新点(2,0)},
},
{
{新点(0,0),新点(0,1),新点(1,0),新点(1,1)},
{新点(0,0),新点(0,1),新点(1,0),新点(1,1)},
{新点(0,0),新点(0,1),新点(1,0),新点(1,1)},
{新点(0,0),新点(0,1),新点(1,0),新点(1,1)},
},
};
//定义颜色
私有最终颜色[]myColor={Color.CYAN,Color.品红色,Color.橙色,Color.黄色,Color.黑色,Color.粉色,Color.red};
私人点;
私用电流片;
私有整数旋转;
private ArrayList nextpice=new ArrayList();
私人长分数;
私人色彩[][]良好;
私有void init(){
井=新颜色[12][24];
对于(int i=0;i你看到控制台有没有任何可能的错误?因为当我运行你的代码时,我在这行中得到了ArrayIndexOutOfBounds
异常(在paintComponent
方法内部):g.setColor(well[i][j]);
。你的外循环是for(int i=0;i<23;i++)
而井
数组是新颜色[12][24]
。难怪会发生这种情况。将循环更改为for(int i=0;i<12;i++)
将使帧可见
不过也有一些注意事项
所有swing应用程序都必须在自己的线程上运行,称为EDT(事件调度线程)。在main
中调用SwingUtilities\invokeLater
,然后让应用程序在那里运行
SwingUtilities.invokeLater(()->{
JFrame f = new JFrame("Tetris002");
....
});
与其创建一个新线程
,不如看看如何使用javax.swing.Timer
看起来更好(从代码的角度来看),它是为这种情况创建的,因为任务将在EDT中运行。用很少的话,糟糕的(代码外观)线程
部分变成:
new Timer(1000, e -> {
game.drop();
}).start();
当您@覆盖paintComponent
时,请始终调用super.paintComponent(g)
。让组件“正常”绘制,然后执行以下操作:
你看到控制台有没有任何可能的错误?因为当我运行你的代码时,我在这行中得到了一个ArrayIndexOutOfBounds
异常(在paintComponent
方法中):g.setColor(well[I][j]);
。你的外循环是for(inti=0;I<23;I++
,而well
数组是新颜色[12][24]
。难怪会发生这种情况。将循环更改为(int i=0;i<12;i++)的将使帧可见
不过也有一些注意事项
所有swing应用程序都必须在自己的线程上运行,称为EDT(事件调度线程)。在main
中调用SwingUtilities\invokeLater
,然后让应用程序在那里运行
SwingUtilities.invokeLater(()->{
JFrame f = new JFrame("Tetris002");
....
});
与其创建一个新线程
,不如看看如何使用javax.swing.Timer
看起来更好(从代码的角度来看),它是为这种情况创建的,因为任务将在EDT中运行。用很少的话,糟糕的(代码外观)线程
部分变成:
new Timer(1000, e -> {
game.drop();
}).start();
当您@覆盖paintComponent
时,请始终调用super.paintComponent(g)
。让组件“正常”绘制,然后执行以下操作:
问题是函数paintComponent
。您给数组赋值很好。您超出了边界。在数组上循环时,我建议使用array.length
函数,而不是手动设置其长度。无论如何,如果您这样更改函数,它应该可以工作
public void paintComponent(Graphics g) {
g.fillRect(0, 0, 26 * 12, 26 * 23);
for (int i = 0; i < well.length; i++) {
for (int j = 0; j < well[i].length; j++) {
g.setColor(well[i][j]);
g.fillRect(26 * i, 26 * j, 25, 25);
}
}
g.setColor(Color.WHITE);
g.drawString("Score:" + score, 19 * 12, 25);
drawPiece(g);
}
公共组件(图形g){
g、 fillRect(0,0,26*12,26*23);
for(int i=0;i