求援，当用户输入的内容为java关键字时，就将它以不同颜色或不同字体显示 ，在线等

Question

是的，我有一个记事，当用户在里边写一些东西时，当用户输入一此java 的关键字时，就要对这些关键字作一些特殊的显示，就是编译器里一样的

Answer 1

按我的思路：
你可以将关键字放到一个ArrayList中，在输入单词时判断是否与关键字匹配，单词是以空格和各种符号(如=,+-(等)分隔
也可以参考一下别人的编辑器

Answer 2

我也是这样想的啊，但是当用户输入一此<- or  Delete or  -> or 向上，向下 移一行，我就要得到，我怎么得到它当前操作的是哪一个字符串呢我怎么得到当前的光标的位置

Answer 3

import java.awt.*;
import java.awt.event.*;
import java.lang.StringBuffer;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;class MyEditorKit extends DefaultEditorKit
{
    public MyEditorKit(){
        super();
    }    public ViewFactory getViewFactory(){
        return new MyViewFactory();
   }
}class MyViewFactory implements ViewFactory
{
    public MyViewFactory(){
    }    public View create(Element element){
        return new MyEditorView(element);
    }
}class MyEditorView extends PlainView implements MouseMotionListener
{
    boolean isDragging=false;
    public MyEditorView(Element element){
        super(element);
    }    protected int drawUnselectedText(Graphics g, int x, int y, int p0, int p1)
        throws BadLocationException{
        if(isDragging) return x;        Document doc=getDocument();
        Segment segment=new Segment(), token=new Segment();
        int index=0, count=p1-p0;
        char c='\u0000';        doc.getText(p0, count, segment);
        for(int i=0; i<count; i++){
            if(Character.isLetter(c=segment.array[segment.offset+i])||c=='_'){  // :)
                index=i;
                while(++i<count&&(Character.isLetter((c=segment.array[segment.offset+i]))||c=='_'||(c>='0'&&c<='9')));
                doc.getText(p0+index, (i--)-index, token);
                if(KeyWord.isKeyWord(token)){
//                  g.setFont(KEYWORDFONT);
                    g.setColor(KEYWORDCOLOR);
                }else{
                    g.setFont(TEXTFONT);
                    g.setColor(TEXTCOLOR);
                }
                x=Utilities.drawTabbedText(token, x, y, g, this, p0+index);
                continue;
            }else if(c>='0'&&c<='9'){
                index=i;
                while(++i<count&&(c=segment.array[segment.offset+i])>='0'&&c<='9');
                doc.getText(p0+index, (i--)-index, token);
                g.setColor(NUMCOLOR);
                x=Utilities.drawTabbedText(token, x, y, g, this, p0+index);
                continue;
            }else if(c=='/'){
                index=i;
                if(++i<count&&segment.array[segment.offset+i]=='/'){
                    doc.getText(p0+index, count-index, token);
                    g.setFont(COMMENTFONT);
                    g.setColor(COMMENTCOLOR);
                    x=Utilities.drawTabbedText(token, x, y, g, this, p0+index);
                    break;
                }
                doc.getText(p0+index, 1, token);
                g.setFont(TEXTFONT);
                g.setColor(TEXTCOLOR);
                x=Utilities.drawTabbedText(token, x, y, g, this, p0+index);
                i--;
                continue;
            }else if(c=='\''||c=='\"'){
                index=i;
                char ch='\u0000';
                while(++i<count){
                    if((ch=segment.array[segment.offset+i])=='\\'){
                        i++;
                        continue;
                    }else if(ch==c) break;
                }
                if(i>=count) i=count-1;
                doc.getText(p0+index, i-index+1, token);
g.setColor(Color.yellow);
g.fillRect(x, y-8, 4, 12);
                g.setFont(STRINGFONT);
                g.setColor(STRINGCOLOR);
                x=Utilities.drawTabbedText(token, x, y, g, this, p0+index);
                continue;
            }else{
                index=i;
                while(++i<count&&!Character.isLetter((c=segment.array[segment.offset+i]))&&c!='_'&&c!='/'&&c!='\''&&c!='\"'&&(c<'0'||c>'9'));
                doc.getText(p0+index, (i--)-index, token);
                g.setFont(TEXTFONT);
                g.setColor(TEXTCOLOR);
                x=Utilities.drawTabbedText(token, x, y, g, this, p0+index);
            }
        }
        return x;
    }    protected int drawSelectedText(Graphics g, int x, int y, int p0, int p1)
        throws BadLocationException{
        g.setFont(TEXTFONT);
        g.setColor(TEXTCOLOR);        isDragging=(p0-p1==0);        return super.drawSelectedText(g, x, y, p0, p1);
    }    public void mouseDragged(MouseEvent e){    }    public void mouseMoved(MouseEvent e){
    }    public static Font TEXTFONT=new Font("DialogInput", Font.PLAIN, 11);
    public static Color TEXTCOLOR=Color.black;
    public static Font NUMFONT=new Font("DialogInput", Font.PLAIN, 11);
    public static Color NUMCOLOR=Color.blue;
    public static Font KEYWORDFONT=new Font(TEXTFONT.getFontName(), Font.BOLD, TEXTFONT.getSize());
    public static Color KEYWORDCOLOR=new Color(0, 0, 128);
    public static Font  COMMENTFONT=TEXTFONT;
    public static Color COMMENTCOLOR=new Color(192, 192, 192);
    public static Font STRINGFONT=TEXTFONT;
    public static Color STRINGCOLOR=new Color(255, 0, 0);
}class KeyWord
{
    public KeyWord(){
    }    public static boolean isKeyWord(Segment seg){
        boolean isKey=false;
        for(int i=0; !isKey&&i<KEYWORDS.length; i++)
           if(seg.count==KEYWORDS[i].length()){
               isKey=true;
               for(int j=0; isKey&&j<seg.count; j++)
                   if(seg.array[seg.offset+j]!=KEYWORDS[i].charAt(j))
                       isKey=false;           }
       return isKey;
    }    public static final String[] KEYWORDS={
        "abstract",
        "boolean", "break", "byte",
        "case", "catch", "char", "class", "const", "continue",
        "default", "do", "double",
        "else", "extends",
        "final", "finally", "float", "for",
        "goto",
        "if", "implements", "import", "instanceof", "int", "interface",
        "long",
        "native", "new",
        "package",
        "private", "protected", "public",
        "return",
        "short", "static", "strictfp", "super", "switch", "synchronized",
        "this", "throw", "throws", "transient", "try",
        "void", "volatile",
        "while",
        "true", "false"
    };
}public class Editor extends JFrame
{
    Container c;
    JEditorPane editor=new JEditorPane();
    MyEditorKit  kit=new MyEditorKit(); public Editor(){
super("Editor");
initFrame();
setSize(640, 480);
} private void initFrame(){
c=getContentPane();
c.setLayout(new BorderLayout());
        editor.setFont(new Font("DialogInput", Font.PLAIN, 11));
        editor.setEditorKitForContentType("text/java", kit);
        editor.setContentType("text/java");        editor.addCaretListener(new CaretListener(){
            public void caretUpdate(CaretEvent e){
            }
        });
        c.add(new JScrollPane(editor), BorderLayout.CENTER);
} public static void main(String[] args){
Editor App=new Editor();
App.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
App.show();
}
}