ByteBuffer的slice()方法

字節緩沖區切片

直接看個例子：

    @Test
    public void test1() {
        byte[] bytes = new byte[]{1,2,3,4,5};
        ByteBuffer byteBuffer = ByteBuffer.wrap(bytes);
        //使用slice之前，一般先調用position()和limit()方法，
        byteBuffer.position(2);
        // 2 5 5
        log.info("position:{},limit:{},capacity:{}", byteBuffer.position(), byteBuffer.limit(), byteBuffer.capacity());
        ByteBuffer byteBuffer1 = byteBuffer.slice();
        // 12345->345
        log.info("position:{},limit:{},capacity:{}", byteBuffer.position(), byteBuffer.limit(), byteBuffer.capacity());
        log.info("position:{},limit:{},capacity:{}", byteBuffer1.position(), byteBuffer1.limit(), byteBuffer1.capacity());
        byteBuffer1.put((byte)6);
        for (int i = 0; i < bytes.length; i++) {
            System.out.print(bytes[i]);
        }
        //使用slice()后，再調用arrayOffset()方法時，會出現返回值非0的情況
        //其是對原緩沖區的偏移
        log.info("offset:{}", byteBuffer1.arrayOffset());

    }

輸出結果：

2021-01-10 22:46:05 [INFO] position:2,limit:5,capacity:5
2021-01-10 22:46:05 [INFO] position:2,limit:5,capacity:5
2021-01-10 22:46:05 [INFO] position:0,limit:3,capacity:3
2021-01-10 22:46:05 [INFO] offset:2
12645

參考鏈接：https://www.cnblogs.com/marcotan/p/4256936.html