Java移除注释

public class Comments {
    StringBuilder template;
    final String holder1 = "←";
    final String holder2 = "↓";
    final String holder3 = "↖";
    int quote = 1024;

    public Comments(String template) throws Exception {
        this.template = new StringBuilder(template);
        //这段代码可有可无，安全起见最好加上
        if (template.indexOf(holder1) > -1)
            throw new Exception("this file already have the placeholder1, please check your file before compile!!");
        if (template.indexOf(holder2) > -1)
            throw new Exception("this file already have the placeholder2, please check your file before compile!!");
        if (template.indexOf(holder3) > -1)
            throw new Exception("this file already have the placeholder3, please check your file before compile!!");
        //这段代码可有可无，安全起见最好加上
    }

    public StringBuilder analysis() {
        String[] str1 = new String[quote];
        escape(template,"\\",holder1,str1);
//----------------------------------------------------------------------------
        String[] str2 = new String[quote];
        replace(template,"\"",holder2,str2);
//----------------------------------------------------------------------------
        String[] str3 = new String[quote];
        replace(template,"\"",holder3,str3);
//----------------------------------------------------------------------------
        replaceA(template,"//","\n");
        replaceB(template,"/*","*/");
//----------------------------------------------------------------------------
        restore(template,str3,holder3);
        restore(template,str2,holder2);
        restore(template,str1,holder1);

        return template;
    }

    private void restore(StringBuilder sb,String[] from,String holder){
        for (int i = 0; i < from.length; i++) {
            String ch = holder+i;
            int po = sb.indexOf(ch);
            if(po > -1)
            sb.replace(po,po+ch.length(),from[i]);
        }
    }

    private void escape(StringBuilder sb,String ch,String holder,String[] restore){
        int po1 = sb.indexOf(ch);
        int po2 = po1+2;

        int index = 0;
        while(po1 != -1){
            restore[index] = sb.substring(po1, po2);
            sb.replace(po1,po2,holder+index);
            index++;
            po1 = sb.indexOf(ch);
            po2 = po1+2;
        }
    }

    private void replace(StringBuilder sb,String ch,String holder,String[] restore){
        int po1 = sb.indexOf(ch);
        int po2 = sb.indexOf(ch,po1+1)+1;

        int index = 0;
        while(po1 != -1 && po2 != -1){
            restore[index] = sb.substring(po1, po2);
            sb.replace(po1,po2,holder+index);
            index++;
            po1 = sb.indexOf(ch);
            po2 = sb.indexOf(ch,po1+1)+1;
        }
    }

    private void replaceA(StringBuilder sb,String from,String to){
        int po1 = sb.indexOf(from);
        int po2 = sb.indexOf(to,po1+1);

        while(po1 != -1 && po2 != -1){
            sb.replace(po1,po2,"");
            po1 = sb.indexOf(from);
            po2 = sb.indexOf(to,po1+1);
        }
    }

    private void replaceB(StringBuilder sb,String from,String to){
        int po1 = sb.indexOf(from);
        int po2 = sb.indexOf(to,po1+1)+2;

        while(po1 != -1 && po2 != -1){
            sb.replace(po1,po2,"");
            po1 = sb.indexOf(from);
            po2 = sb.indexOf(to,po1+1)+2;
        }
    }
}