Question

我创建了一个框架并将图像显示为框架。但我无法设定框架的大小。正如我尝试过代码, 但是它给了我我设定的部分图像, 而不是整个图像。请帮助我调整图像大小。

JFrame frame = new JFrame("My Window");
frame.setSize(200,200);
int frameWidth = 200;
int frameHeight = 200;
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
frame.setBounds((int) screenSize.getWidth() - frameWidth, 0, frameWidth, frameHeight);
frame.pack();
frame.setVisible(true);

Answer 1

You are mixing absolute positioning and usage of layout managers. When you call setSize() or setBounds(), you are using absolute layout, ie, you manage manually the size and location of your components.

当您调用 pack () 时, 您会将配置和定位委托给您框架中组件的布局管理器。布局管理器根据其首选/ minim/ 最大大小和限制, 将组件的位置和大小根据其首选/ minim/ 最大大小和限制来决定。见关于布局管理器 < a href= > 的所有信息 http://docs. oracle. com/javase/tumental/ uiswing/ layout/ using. html" rel=“ no follow” >这里。

我建议依赖布局管理者因为它在不同平台上效果更好你的代码会更干净

Answer 2

package test.t100.t004;

import java.awt.Image;
import java.net.URL;

import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;

public class ImageSizedGUI {

    ImageSizedGUI(Image image) {
        JLabel label = new JLabel(new ImageIcon(image));

        JFrame f = new JFrame("Image");
        f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        // either this, or..
        f.setContentPane(new JScrollPane(label));

        f.pack();
        // ..this, but could produce undesirable results for images 
        // that are larger than screen size!
        // f.setMinimumSize(f.getSize());
        f.setLocationByPlatform(true);
        f.setVisible(true);
    }

    public static void main(String[] args) throws Exception {
        String address = (args.length>0 ? args[0] :
                "http://pscode.org/media/stromlo2.jpg");
        URL url = new URL(address);
        final Image image = ImageIO.read(url);
        SwingUtilities.invokeLater(new Runnable(){
            public void run() {
                new ImageSizedGUI(image);
            }
        });
    }
}

友情链接