我使用 Swing 用 Java 制作了一个扫雷游戏，但是当我运行它时，JFrame 没有弹出？ (没有错误) 它运行，但没有窗口显示。尝试调试没有成功。
非常感谢您的帮助:)
请注意，在 GameBoard 类中:
imgs = new Image[13]; //Number of images used
//Loading images, used later
for (int i = 0; i < 13; i++) {
imgs[i] = (new ImageIcon(i + ".png")).getImage();
}
这些行加载由我创建的代表图像(13 个图像)的数字，这些图像的 loadid 取决于鼠标适配器。
这是具有 main 方法的 MineSweeper 类:
package minesweeper;
import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;
public class MineSweeper extends JFrame {
public JLabel label;
public MineSweeper(){
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setSize(600, 600);
this.setLocationRelativeTo(null);
this.setTitle("Minesweeper");
label = new JLabel("");
this.add(label, BorderLayout.SOUTH);
GameBoard game = new GameBoard(label);
this.add(game);
setResizable(false);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
MineSweeper jf = new MineSweeper();
jf.setVisible(true);
}
});
}
}
这是 GameBoard 类:
package minesweeper;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.Random;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class GameBoard extends JPanel {
//Adding constant variables
private final int SIZE_OF_CELL = 20;
private static final int NUM_OF_ROWS = 20;
private static final int NUM_OF_CL = 20;
private final int SIZE_OF_FIELD = NUM_OF_ROWS * NUM_OF_CL;
//Adding other variables
private int NUM_OF_MINES_LEFT;
private Image[] imgs;
private static int[][] gameboard;
public static int mines = 40;
private int all_cells;
private static JLabel label;
boolean gamestarted = true; // Game is in progress, already started
//Constructor 1 parameter
public GameBoard(JLabel inputlabel) {
this.label = inputlabel;
imgs = new Image[13]; //Number of images used
//Loading images, used later
for (int i = 0; i < 13; i++) {
imgs[i] = (new ImageIcon(i + ".png")).getImage();
}
setDoubleBuffered(true);
addMouseListener(new Manager());
StartNewGame();
}
//Find mines around cell[i][j]
public static int FindMines(int ro, int co){
int cnt=0;
for(int y=-1;y<=1;y++){
for(int x = -1; x<=1;x++){
if(x==0 && y ==0) continue;
if(ro+y<0) continue;
if(co+x<0) continue;
if(gameboard[ro+y][co+x]==19) cnt++;
}
}
return cnt;
}
public static void StartNewGame(){
//NUM_OF_MINES_LEFT = 40; // Default value for number of mines is 30
gameboard = new int[20][20];
int minesleft=mines;
int row,col;
// int mines = NUM_OF_MINES_LEFT;
Random rng=new Random();
label.setText(Integer.toString(minesleft));
//initialize mine field
for(int i=0;i<20;i++){
for (int j=0;j<20;j++){
gameboard[i][j]=10;//default value is 10 -> its covered
}
}
//Set mines in random positions
while (mines>0){
row=rng.nextInt(NUM_OF_ROWS);
col=rng.nextInt(NUM_OF_CL);
if ((gameboard[row][col])!=19){
gameboard[row][col]+=9;;
minesleft--;
}
}
//Set numbers
for(int i=0;i<20;i++){
for (int j=0;j<20;j++){
if(gameboard[i][j]==19) gameboard[i][j]=19;
if(gameboard[i][j]==10){
gameboard[i][j]+= FindMines(i,j);
}
}
}
}
//public int FindEmptyCells(){
//}
@Override
public void paintComponent(Graphics grap){
int gamewon=0;
int[][] temp = new int[20][20];
for(int i=0;i<20;i++){
for(int j=0;j<20;j++){
temp[i][j]=gameboard[i][j];
if(gamestarted && temp[i][j]==9) gamestarted=false;
if(gamestarted == false){
if(temp[i][j]==19){
temp[i][j]= 9;
}else if(temp[i][j]==29){//10+11 for mark
temp[i][j]=11;
}else if(temp[i][j]>9){
temp[i][j]=10;
}
}else{
if (temp[i][j] > 19)
temp[i][j] = 11;
else if (temp[i][j] > 9) {
temp[i][j] = 10;
gamewon=1;
}
}
int toload= temp[i][j];
grap.drawImage(imgs[toload],j*15,i*15,this);
}
}
if(gamestarted==true && gamewon==0){
gamestarted=false;
label.setText("You won!");
}else if(gamestarted==false){
label.setText("You Lost!");
}
}
class Manager extends MouseAdapter{
@Override
public void mousePressed(MouseEvent ev){
boolean newpaint = false;
//Get event coordinates
int x= ev.getX();
int y= ev.getY();
int hit_cl= x / 15;
int hit_row= y/ 15;
if(gamestarted==false){
StartNewGame();
repaint();
}
if( (x < 20 * 15) && (y < 20 * 15) ){
if(ev.getButton() == MouseEvent.BUTTON3){
if(gameboard[hit_cl][hit_row] > 9){
newpaint=true;
if(gameboard[hit_cl][hit_row] <= 19){
if(mines > 0){
mines--;
String show=Integer.toString(mines);
gameboard[hit_cl][hit_row]+=11;
label.setText(show);
}else{
label.setText("Marks: 0");
}
}else{
mines++;
String show=Integer.toString(mines);
label.setText(show);
gameboard[hit_cl][hit_row]-=11;
}
}
}else{
if(gameboard[hit_cl][hit_row] > 19){
return;
}
if((gameboard[hit_cl][hit_row] > 9) && (gameboard[hit_cl]
[hit_row] <29)){
newpaint=true;
gameboard[hit_cl][hit_row]-=10;
if(gameboard[hit_cl][hit_row] == 9) gamestarted=false;
//if(gameboard[hit_cl][hit_row] == 10); //find_empty();
}
}
if(newpaint==true) repaint();
}
}
}
}
最佳答案
你做了什么调试？ :)
程序永远运行的最明显原因是它永远不会离开循环。
while (mines>0){
row=rng.nextInt(NUM_OF_ROWS);
col=rng.nextInt(NUM_OF_CL);
if ((gameboard[row][col])!=19){
gameboard[row][col]+=9;;
minesleft--;
}
}
StartNewGame() 方法(GameBoard 类)的这一部分导致无限循环，mines 变量永远不会在循环内更新。
快速查看您的代码，我可以注意到一些不好的做法，例如:
- 您不应该控制游戏状态或在其中设置标签文本 PaintComponent() 方法。该方法会被自动调用，并且它 应该仅绘制所有组件。所有的“逻辑”都在里面 可能会减慢你的程序，因为你无法控制有多少 该方法被调用的次数(当然你可以强制该方法 例如，使用 repaint() 方法调用)。
- 您应该关注java naming conventions
希望这有帮助:)
关于Java Swing JFrame 打不开(扫雷游戏)？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40695162/