ByteArrayInputStream&ByteArrayOutputStream源码分析

＃ByteArrayInputStream

源码

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public synchronized int read(byte b[], int off, int len) {

if (b == null) {

throw new NullPointerException();

} else if (off < 0 || len < 0 || len > b.length - off) {

throw new IndexOutOfBoundsException();

}

    if (pos >= count) {
        return -1;
    }

    int avail = count - pos;
    if (len > avail) {
        len = avail;
    }
    if (len <= 0) {
        return 0;
    }
    System.arraycopy(buf, pos, b, off, len);
    pos += len;
    return len;
}

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＃ByteArrayOutputStream