read(Reader reader)

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        int BLOCK;        char ach[];        CharArrayWriter writer;        BLOCK = 1024;        ach = new char[BLOCK];        writer = new CharArrayWriter(BLOCK);        int cch;_L2:        int cch;        cch = reader.read(ach, 0, BLOCK);        if(cch < 0)            break MISSING_BLOCK_LABEL_55;        if(cch <= 0) goto _L2; else goto _L1_L1:        writer.write(ach, 0, cch);          goto _L2        EOFException e;        e;        reader.close();        return writer.toString();

//以上说明 <0 break; =0 继续 ，>0执行writer.write(ach, 0, cch); 

主逻辑可以整理为如下： 

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        while((cch = reader.read(ach, 0, BLOCK))>=0){if(cch=0)continue;        writer.write(ach, 0, cch);         }

完美的代码应该如下： 

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    public static String read(Reader reader)        throws IOException    {        int BLOCK = 1024;        char ach[] = new char[BLOCK];        CharArrayWriter writer = new CharArrayWriter(BLOCK);        do        {            try            {                int cch = reader.read(ach, 0, BLOCK);                if(cch < 0)                    break;                if(cch > 0)                    writer.write(ach, 0, cch);                continue;            }            catch(EOFException e) { }            break;        } while(true);        reader.close();        return writer.toString();    }