read()和read(byte[])差别在哪里
逐个字节去复制一个文件，效率超慢，都说用read(byte[])，查看api里面的似乎read(byte[])也是循环调用read函数代码如下[code] public int read(byte b[], int off, int len) throws IOException {
if (b == null) {
throw new NullPointerException();
} else if (off < 0 || len < 0 || len > b.length - off) {
throw new IndexOutOfBoundsException();
} else if (len == 0) {
return 0;
}
int c = read();
if (c == -1) {
return -1;
}
b[off] = (byte)c;
int i = 1;
[color=Red] try {
for (; i < len ; i++) {
c = read();
if (c == -1) {
break;
}
b[off + i] = (byte)c;
}[/color]
} catch (IOException ee) {
}
return i;
}[/code]
不大清楚为什么read(byte[])也是逐个字节从磁盘读?????
页:
[1]