java如何在JFrame中设置JPanel的大小？
我想为我的地图和更高版本的迷你地图创建一个自定义大小的JPanel，地图生成器和spritesheet阅读器工作正常。但是，当我将JPanel设置为与JFrame不同的大小，然后使用setSize（）或setBounds（）并运行程序时，它的尺寸与JFrame相同
主要类别：
import java.awt.Color;
import java.awt.image.BufferedImage;
import java.util.Random;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class Main extends JPanel {
private static SpriteSheet sc = new SpriteSheet();
private static JLabel[][] mapTiles = new JLabel[40][40];
private static int[][] mapTileCode = new int[40][40];
public Main() {
JFrame f = new JFrame();
setLayout(null);
this.setSize(625, 625);
f.add(this);
f.setSize(1000, 1000);
f.setUndecorated(true);
f.setLocationRelativeTo(null);
this.setBackground(new Color(150, 150, 150));
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
}
public static void main(String args[]) {
new Main().mapSetup();
}
public void mapSetup() {
Random r = new Random();
for (int x = 0; x < 40; x++) {
for (int y = 0; y < 40; y++) {
int l = r.nextInt(6);
BufferedImage i = sc.getTile(l);
ImageIcon im = new ImageIcon(i);
mapTileCode[y][x]=l;
mapTiles[y][x] = new JLabel(im);
mapTiles[y][x].setBounds(y * 25, x * 25, 25, 25);
this.add(mapTiles[y][x]);
repaint();
}
}
}
}
SpriteSheet类：
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
public class SpriteSheet {
final int W = 25;
final int H = 25;
BufferedImage spriteSheet;
public BufferedImage getTile(int tile) {
if (new File("img/SpriteSheet.png").exists()) {
try {
spriteSheet = ImageIO.read(new File("img/SpriteSheet.png"));
} catch (IOException e) {
e.printStackTrace();
}
int tileX = 1 + tile + (tile * 25);
int tileY = 1 + (0 * 25);
return spriteSheet.getSubimage(tileX, tileY, 25, 25);
} else {
System.err.println("no files found");
return null;
}
}
}
# 1 楼答案
你看到的结果是由LayoutManager带来的。你（至少）有两个选择：