【发布时间】：2019-09-10 18:55:56
【问题描述】：
到现在为止，我觉得我已经尝试了一切。我在尝试着 运行这个简单的俄罗斯方块游戏，但即使我没有 那里的例外情况，它仍然将 JFrame 窗口显示为黑色，并带有一个小 左上角的白色矩形。
这是我已经尝试过的：
- 玩弄 f.setVisible(true);正如许多人所建议的那样。
- 检查可能的无限循环（将 =+1 更改为 +=1）
- 还尝试包括：
//f.add(panel); //f.pack();
我的代码：
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();
}
}
【问题讨论】：
-
使用您发布的代码，我没有看到与您说的相同的错误。我在
paintComponent中遇到了一个异常，因为i最多为24，而数组只有12 个项目长。但如果越界异常得到修复，游戏就会开始（大部分）正确运行。