Comments/Swing

import java.util.*;
import javax.swing.*;
public class Test {
  public static void main(String[] args) {
    //for(Object o: UIManager.getLookAndFeelDefaults().keySet())
    //System.out.println(o);
    for(Map.Entry<?,?> entry: UIManager.getDefaults().entrySet())
      System.out.println(entry.getKey());
  }
}

//aが押されても何もしない
textField.getInputMap(JComponent.WHEN_FOCUSED).put(KeyStroke.getKeyStroke("typed a"), "none");

• Overriding a Few Default Typed Key Bindings in a JTextComponent (Java Developers Almanac Example)

• Validating Text and Filtering Documents and Accessibility and the Java Access Bridge Tech Tips
• Implementing a Document Filter

//https://ateraimemo.com/data/swing/Sample.java
public void zooming(double zoom) {
  double origzoom = this.zoom;
  this.zoom = zoom;
  Point p = spCanvas.getViewport( ).getViewPosition( ); //左上の座標
  canvas.setPreferredSize(
    new Dimension((int)( PWIDTH * zoom ) , (int)( PHEIGHT * zoom )));
  canvas.revalidate( );
  // 左上の位置を拡大縮小した大きさでの位置にあわせる
  //<ins>
  Point pt = new Point(
    (int)( p.x * zoom / origzoom ) , (int)( p.y * zoom / origzoom ));
  canvas.scrollRectToVisible(new Rectangle(pt, spCanvas.getViewport( ).getSize()));
  //</ins>
  spCanvas.getViewport( ).setViewPosition(pt);
}

import java.awt.*;
import javax.swing.*;
public class Test{
  public static void main(String[] args) {
    //<XXX>
    createAndShowGUI();
    //</XXX>
    //EventQueue.invokeLater(new Runnable() {
    //  public void run() {
    //    createAndShowGUI();
    //  }
    //});
  }
  public static void createAndShowGUI() {
    JFrame frame = new JFrame();
    //<XXX>
    frame.setVisible(true);
    frame.setSize(300,200); //or frame.pack();
    frame.setLocationRelativeTo(null);
    //</XXX>
    frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    frame.getContentPane().add(new JScrollPane(new JTree()));
    //frame.setSize(320,240); //or frame.pack();
    //frame.setLocationRelativeTo(null);
    //frame.setVisible(true);
  }
}

import java.io.*;
public class Hoge {
  public static void main(String[] args) {
    try {
//       FileReader in = new FileReader(
//           new File(Hoge.class.getResource("hoge.ini").toURI()));
//       int ch;
//       while ((ch = in.read()) != -1) {
//         System.out.print((char)ch);
//       }
//       in.close();
      BufferedReader br = new BufferedReader(new InputStreamReader(
          Hoge.class.getResourceAsStream("hoge.ini"), "UTF-8"));
      String line;
      while ((line = br.readLine()) != null) {
        System.out.println(line);
      }
      br.close();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
public class Test {
  public static void main(String[] args) {
    for(String key:Arrays.asList(
      "win.frame.captionFont", "win.icon.font",
      "win.frame.captionFont", "win.menu.font",
      "win.messagebox.font", "win.frame.smallCaptionFont",
      "win.menu.font", "win.tooltip.font")) {
      System.out.println(Toolkit.getDefaultToolkit().getDesktopProperty(key));
    }
  }
}

((DefaultTableModel)table.getModel()).addRow(...); //JTableに行を追加
int i = table.convertRowIndexToView(table.getRowCount()-1); //ソートしないならconvertRowIndexToViewは必要ない
table.scrollRectToVisible(table.getCellRect(i, 0, true)); //追加した行の0列目のセル取得してscrollRectToVisibleで可視化