Question

尝试（FileOutputStream binFile = new FileOutputStream（“ data.dat”）; FileChannel binChannel = binFile.getChannel（））{

        ByteBuffer buffer = ByteBuffer.allocate(100);
        byte[] outputBytes = "Hello World!".getBytes();
        buffer.put(outputBytes);
        long int1Pos = outputBytes.length;
        buffer.putInt(245);

        binChannel.write(buffer);

        java.io.RandomAccessFile ra = new java.io.RandomAccessFile("data.dat", "rwd");
        FileChannel channel = ra.getChannel();

        ByteBuffer readBuffer = ByteBuffer.allocate(100);

        channel.position(int1Pos);
        channel.read(readBuffer);
        readBuffer.flip();
        System.out.println("Int3 = " + readBuffer.getInt());
         } catch(IOException e){
         }

Answer 1

您应该在其上签出Java文档。 https://docs.oracle.com/javase/7/docs/api/java/nio/Buffer.html

翻转此缓冲区。将限制设置为当前位置，然后将该位置设置为零。如果定义了标记，则将其丢弃。在执行一系列通道读取或放置操作之后，调用此方法以准备一系列通道写入或相对get操作。例如：

java：buffer.flip（）方法的确切功能是什么？

1 个答案: