Java JFrame .setSize(x,y)不起作用?

时间:2013-05-10 01:07:56

标签: java swing window jframe

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

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);
}

1 个答案:

答案 0 :(得分:3)

  1. 创建一个自JPanel扩展的自定义组件,覆盖其getPreferredSize方法,以返回您想要的窗口大小。
  2. 将其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
  4. 更新了示例

    enter image description here

    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();
            }
        }    
    }