Java JFrame .setSize(x, y) 不起作用?

问题描述

当我执行这段代码时，会弹出一个小窗口，里面大约是 116x63，整个大小包括 ~140x100 的边框.我如何将内部设置为我需要的?

When I execute this bit of code, a tiny window pops up that, and the inside of it is about 116x63, and the entire size including the border of ~140x100. How do I set the inside to be what I need it to?

public static void graphics() {
    JFrame frame = new JFrame();

    String title = "test window";
    frame.setTitle(title);

    frame.setSize(gridRow, gridCol); //101 x 101
    frame.setResizable(true);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
}

推荐答案

1. 创建一个自定义组件，从 JPanel 扩展，覆盖其 getPreferredSize 方法以返回您想要的窗口大小.
2. 将此添加到您的框架或将其设置为框架的内容窗格.
3. 在框架上调用pack

1. Create a custom component, extending from JPanel, override its getPreferredSize method to return the size of the window you would like.
2. Either add this to your frame or set it as the frame's content pane.
3. Call pack on the frame

更新示例

在我的电脑上，Frame size = java.awt.Dimension[width=216,height=238]

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class TestFrameSize01 {

    public static void main(String[] args) {
        new TestFrameSize01();
    }

    public TestFrameSize01() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);

                System.out.println("Frame size = " + frame.getSize());
            }
        });
    }

    public class TestPane extends JPanel {

        public TestPane() {
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(200, 200);
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            Graphics2D g2d = (Graphics2D) g.create();
            String text = getWidth() + "x" + getHeight();
            FontMetrics fm = g2d.getFontMetrics();
            int x = (getWidth() - fm.stringWidth(text)) / 2;
            int y = ((getHeight() - fm.getHeight()) / 2) + fm.getAscent();
            g2d.drawString(text, x, y);
            g2d.dispose();
        }
    }    
}

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