JTree的例子和Frame居中显示

最新推荐文章于 2025-07-13 10:34:36 发布

原创最新推荐文章于 2025-07-13 10:34:36 发布 · 1.3k 阅读

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import java.awt.*;
import javax.swing.*;
import javax.swing.tree.*;

public class jtree{
public static void main(String args[]){
  //DefaultMutableTreeNode root=new DefaultMutableTreeNode("root");

  JTree jt=new JTree();//构造函数：JTree()

  JPanel jp=new JPanel();
  jp.setLayout (new BoxLayout (jp, BoxLayout.X_AXIS));
  jp.setPreferredSize(new Dimension(700,400));
  jp.add(new JScrollPane(jt));
  JFrame jfrm=new JFrame("JFrame");
  jfrm.setContentPane(jp);
  jfrm.pack();
  jfrm.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);


  // center frame in screen
  Toolkit kit = Toolkit.getDefaultToolkit();
  Dimension screenSize = kit.getScreenSize();
  int screenHeight = screenSize.height;
  int screenWidth = screenSize.width;
  jfrm.setSize(500,300);
  int frameH=jfrm.getHeight();
  int frameW=jfrm.getWidth();
  jfrm.setLocation((screenWidth-frameW) / 2, (screenHeight-frameH) / 2);


  jfrm.setVisible(true);
}
}