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public static class JButtonEx extends JButton {
		public JButtonEx(String str) {
			setText(str);
		}
		public JButtonEx() {
		}
		@Override
		public Point getToolTipLocation(MouseEvent e) {
			Point po = e.getPoint();
			po.x += 20;
			po.y -= 10;
			return po;
		}
	}

import java.util.Enumeration;
import java.util.TreeSet;
import javax.swing.UIDefaults;
import javax.swing.UIManager;

public class ListUIDefaultsKeys {
	public static void main(String args[]) throws Exception {
		UIManager.LookAndFeelInfo looks[] = UIManager.getInstalledLookAndFeels();

		for (UIManager.LookAndFeelInfo info : looks) {
			System.out.println("Installed L&F "+info.getName());
		}

		TreeSet<String> lafDefaultKeys = new TreeSet<>();
		UIDefaults defaults = UIManager.getDefaults();

		Enumeration<Object> newKeys = defaults.keys();
		while (newKeys.hasMoreElements()) {
				lafDefaultKeys.add(newKeys.nextElement().toString());
		}

		System.out.println("================== UIDefaults Keys & Values ==================");
		
		int i = 1;
		for (String key : lafDefaultKeys) {
				try {
						String value = defaults.get(key).toString();
						System.out.println(String.format("%03d", i) + " " + key );
						System.out.println("    " + value);
				} catch (Exception e){
						e.printStackTrace();
				}
				i++;
		}
	}
}
--------------------------------------------------

出力の一部
--------------------------------------------------
================== UIDefaults Keys & Values ==================
001 AbstractButton.click.textAndMnemonic
    クリック
002 AbstractDocument.addition.textAndMnemonic
    追加
003 AbstractDocument.deletion.textAndMnemonic
    削除
004 AbstractDocument.redo.textAndMnemonic
    やり直し
005 AbstractDocument.styleChange.textAndMnemonic
    スタイル変更
006 AbstractDocument.undo.textAndMnemonic
    元に戻す
007 AbstractUndoableEdit.redo.textAndMnemonic
    やり直し
008 AbstractUndoableEdit.undo.textAndMnemonic
    元に戻す
009 AuditoryCues.allAuditoryCues
    [Ljava.lang.Object;@4ac68d3e
010 AuditoryCues.cueList
    [Ljava.lang.Object;@4ac68d3e
011 AuditoryCues.noAuditoryCues
    [Ljava.lang.Object;@3339ad8e
＜以下略＞

# VSCode Extension Pack for Java
--------------------------------------------------
Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
        Unreachable catch block for InvalidPropertiesFormatException. This exception is never thrown from the try statement body
        Unreachable catch block for FileNotFoundException. This exception is never thrown from the try statement body
        Unreachable catch block for IOException. This exception is never thrown from the try statement body
        at XMLtoSetProperty.main(XMLtoSetProperty.java:32)
--------------------------------------------------

# javacコマンド
--------------------------------------------------
XMLtoSetProperty.java:32: エラー: 例外FileNotFoundExceptionは対応するtry文の本体ではスローされません
		} catch (FileNotFoundException e){
		  ^
XMLtoSetProperty.java:34: エラー: 例外IOExceptionは対応するtry文の本体ではスローされません
		} catch (IOException e){
		  ^
XMLtoSetProperty.java:36: エラー: 例外InvalidPropertiesFormatExceptionはすでに捕捉されています
		} catch (InvalidPropertiesFormatException e){
		  ^
XMLtoSetProperty.java:58: エラー: 例外IOExceptionは報告されません。スローするには、捕捉または宣言する必要があります
				in.close();
				        ^
XMLtoSetProperty.java:54: エラー: 例外FileNotFoundExceptionは報告されません。スローするには、捕捉または宣言する必要があります
			in = new FileInputStream(file);
			     ^
XMLtoSetProperty.java:55: エラー: 例外IOExceptionは報告されません。スローするには、捕捉または宣言する必要があります
			settings.loadFromXML(in);
			                    ^
エラー6個
--------------------------------------------------

// Windows,Macはサイズ8,Ubuntuは7,Linux Mintは10に設定

public static int font_size(){
	String OS = System.getProperty("os.name").toLowerCase();
	int[] font_sizes = new int[1];
	if (OS.contains("linux")){
		try{
			Process p = Runtime.getRuntime().exec("cat /etc/issue");
			try{
				p.waitFor();
				InputStream is = p.getInputStream();
				InputStreamReader inputStreamReader = new InputStreamReader(is);
				Stream<String> streamOfString= new BufferedReader(inputStreamReader).lines();
				String str = streamOfString.collect(Collectors.joining());
								
				if (str.contains("Ubuntu")){
					int font_size = 7;
					font_sizes[0] = font_size;
				}else if (str.contains("Mint")){
					int font_size = 10;
					font_sizes[0] = font_size;
				}else{
					int font_size = 8;
					font_sizes[0] = font_size;
				}
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			
		} catch (IOException e) {
			e.printStackTrace();
		}
	} else {
		int font_size = 8;
		font_sizes[0] = font_size;
	}
	return font_sizes[0];
}

＜メソッドのみ＞

static int[] showDialog(Component component, String title, Color initialColor) throws HeadlessException{
		int[] color_case = new int[4];
		JColorChooser chooser = new JColorChooser(initialColor != null ? initialColor : Color.white);

		String swatches = UIManager.getString("ColorChooser.swatchesNameText");
		String hsv = UIManager.getString("ColorChooser.hsvNameText");
		String hsl = UIManager.getString("ColorChooser.hslNameText");
		String rgb = UIManager.getString("ColorChooser.rgbNameText");
		String cmyk = UIManager.getString("ColorChooser.cmykNameText");

		List<String> list = Arrays.asList(hsv,hsl,rgb);

		for (AbstractColorChooserPanel p : chooser.getChooserPanels()) {
			if (!list.contains(p.getDisplayName())) {
				chooser.removeChooserPanel(p);
			}
		}
		
		ColorTracker tracker = new ColorTracker(chooser,initialColor);

		ActionListener okListener = new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				int[] colors = tracker.getColor();
				color_case[0] = colors[0];
				color_case[1] = colors[1];
				color_case[2] = colors[2];
				color_case[3] = colors[3];
			}
		};

		ActionListener cancelListener = new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				int[] colors = tracker.getInitial();
				color_case[0] = colors[0];
				color_case[1] = colors[1];
				color_case[2] = colors[2];
				color_case[3] = colors[3];
			}
		};

		// ダイアログを作成
		JDialog dialog = JColorChooser.createDialog(component, title, true, chooser, okListener, cancelListener);
		dialog.setVisible(true);

		return color_case;
	}

	static class ColorTracker implements Serializable{
		JColorChooser chooser;
		Color color;
		int red;
		int green;
		int blue;
		int alpha;
		int[] colors;
	  
		ColorTracker(JColorChooser Chooser,Color initialColor){
			this.chooser = Chooser;
			this.color = initialColor;
			
		}
	  
		int[] getColor(){
			this.color = this.chooser.getColor();

			colors = new int[4];
			colors[0] = this.color.getRed();
			colors[1] = this.color.getGreen();
			colors[2] = this.color.getBlue();
			colors[3] = this.color.getAlpha();

			return colors;
		}
		int[] getInitial(){
			colors = new int[4];
			colors[0] = this.color.getRed();
			colors[1] = this.color.getGreen();
			colors[2] = this.color.getBlue();
			colors[3] = this.color.getAlpha();

			return colors;
		}
	}