如何设置JPanel的宽度和高度? [英] How to Set JPanel's Width and Height?
问题描述
我正在使用 Java 开发 Snake 游戏.电路板(所有操作发生的地方)的宽度和高度应该是固定的(640 像素 * 480 像素).
I'm developing Snake game using Java. Board's (where all action takes it place) width and height should be fixed (640 pixels * 480 pixels).
结构:
- 主类,继承自JFrame类,
- Board 类,继承自 JPanel 类;
- Main class that extends from JFrame class,
- Board class that extends from JPanel class;
在 Main 类中,我有类似的东西...
In Main class I have something like...
setSize( 1024, 768 );
...在董事会课上我有...
...and in Board class I have...
setSize( BOARDS_WIDTH, BOARDS_HEIGHT );
问题是主窗口和唯一窗口似乎是 1024 * 768,但里面的面板 - 不像 640 * 480.我也有 setBackground() 并且背景填充超过 640* 480.
Problem is that main and only windows seems to be like 1024 * 768, but panel inside it - not like 640 * 480. I have setBackground() as well and background is filled more than 640 * 480.
有什么办法可以让 Board 的宽度和高度像 640 * 480,但主窗口的宽度和高度 - 与 Board 的宽度和高度一样多吗?
Is there any way to make Board's width and height like 640 * 480, but main windows width and height - as much as Board's width and height are correct?
现在看起来像这样......
Right now it looks like this...
一切正常......几乎.
All works... almost.
主类:
add( new Board(), BorderLayout.CENTER );
pack();
setResizable( false );
setLocationRelativeTo( null );
setVisible( true );
setDefaultCloseOperation( EXIT_ON_CLOSE );
setTitle( "Snake (by daGrevis)" );
董事会类:
setPreferredSize( new Dimension( 640, 480 ) );
灰色背景为 642 * 482!就像会有 1 个像素的边框一样!
Gray background is 642 * 482! Like there would be border that wraps all by 1 pixel!
推荐答案
拜托,事情发生了 xxx*x,这根本不是真的,检查一下
please, something went xxx*x, and that's not true at all, check that
JButton Size - java.awt.Dimension[width=400,height=40]
JPanel Size - java.awt.Dimension[width=640,height=480]
JFrame Size - java.awt.Dimension[width=646,height=505]
代码(来自 Trail:使用 JFC/Swing 创建 GUI 的基本内容 ,但我仍然满意那会过时 )
code (basic stuff from Trail: Creating a GUI With JFC/Swing , and yet I still satisfied that that would be outdated )
忘记setDefaultCloseOperation()
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class FrameSize {
private JFrame frm = new JFrame();
private JPanel pnl = new JPanel();
private JButton btn = new JButton("Get ScreenSize for JComponents");
public FrameSize() {
btn.setPreferredSize(new Dimension(400, 40));
btn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("JButton Size - " + btn.getSize());
System.out.println("JPanel Size - " + pnl.getSize());
System.out.println("JFrame Size - " + frm.getSize());
}
});
pnl.setPreferredSize(new Dimension(640, 480));
pnl.add(btn, BorderLayout.SOUTH);
frm.add(pnl, BorderLayout.CENTER);
frm.setLocation(150, 100);
frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // EDIT
frm.setResizable(false);
frm.pack();
frm.setVisible(true);
}
public static void main(String[] args) {
java.awt.EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
FrameSize fS = new FrameSize();
}
});
}
}
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