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(); }