本文介绍了在JFrame中显示.png图像?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有点卡住了。为什么不这样做?我只是得到一个错误说:
I am a little stuck. Why wont this work? I just get a error saying:
java.lang.NoSuchMethodError:main
java.lang.NoSuchMethodError: main
线程main中的异常
import java.awt.*; import javax.swing.*; @SuppressWarnings("serial") public class ShowPNG extends JFrame { public void main(String arg) { if (arg == null ) { arg = "C:/Eclipse/workspace/ShowPNG/bin/a.png"; } JPanel panel = new JPanel(); panel.setSize(500,640); panel.setBackground(Color.CYAN); ImageIcon icon = new ImageIcon(arg); JLabel label = new JLabel(); label.setIcon(icon); panel.add(label); this.getContentPane().add(panel); this.setVisible(true); } }
推荐答案
main需要是静态的,并且必须有一个String []的参数,而不是String。
main needs to be static, and must have an argument of String[], not String.
要修复这个在构造函数中的所有内容,例如
To fix this stick everything in a constructor, such as
import java.awt.*; import javax.swing.*; @SuppressWarnings("serial") public class ShowPNG extends JFrame { private ShowPNG(String arg){ if (arg == null ) { arg = "C:/Eclipse/workspace/ShowPNG/bin/a.png"; } JPanel panel = new JPanel(); panel.setSize(500,640); panel.setBackground(Color.CYAN); ImageIcon icon = new ImageIcon(arg); JLabel label = new JLabel(); label.setIcon(icon); panel.add(label); this.getContentPane().add(panel); } public static void main(String[] args) { new ShowPNG(args.length == 0 ? null : args[0]).setVisible(true); } }更多推荐
在JFrame中显示.png图像?
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