Bug 6146 Java Editor Preference Page is missing most of the mnemonics
summary says it all.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/JavaEditorPreferencePage.java
Composite behaviorComposite= new Composite(parent, SWT.NULL);
		GridLayout layout= new GridLayout(); layout.numColumns= 2;
		behaviorComposite.setLayout(layout);
				
		String label= "Highlight matching brackets";
		addCheckBox(behaviorComposite, label, CompilationUnitEditor.MATCHING_BRACKETS, 0);
		
		label= "Matching brackets highlight color:";
		addColorButton(behaviorComposite, label, CompilationUnitEditor.MATCHING_BRACKETS_COLOR, 0);
		
		label= "Text font:";
		addTextFontEditor(behaviorComposite, label, AbstractTextEditor.PREFERENCE_FONT);
		
		label= "&Displayed tab width:";
		addTextField(behaviorComposite, label, JavaSourceViewerConfiguration.PREFERENCE_TAB_WIDTH, 2, 0);
		return behaviorComposite;
	}
	
	private Control createContentAssistPage(Composite parent) {
		Composite contentAssistComposite= new Composite(parent, SWT.NULL);
		GridLayout layout= new GridLayout(); layout.numColumns= 2;
		contentAssistComposite.setLayout(layout);
				
		String label= "Insert &single proposals automatically";
		addCheckBox(contentAssistComposite, label, ContentAssistPreference.AUTOINSERT, 0);
		
		label= "Show only proposals visible in the invocation &context";
		addCheckBox(contentAssistComposite, label, ContentAssistPreference.SHOW_VISIBLE_PROPOSALS, 0);