ByteBuf is a class in the io.netty.buffer package of the Netty library for JAVA. It represents a buffer abstraction with read and write indices that can be used for efficient data transfer between applications.
The capacity method returns the maximum number of bytes that can be stored in a ByteBuf instance. This method is useful for determining the space available in the buffer for writing data.
Here are some example code snippets:
// Creating a ByteBuf instance with a maximum capacity of 1024 bytes ByteBuf buf = Unpooled.buffer(1024); int capacity = buf.capacity(); // returns 1024
// Writing data to the buffer until it reaches capacity while (buf.isWritable()) { buf.writeByte(0x00); }
// Reading data from the buffer until it is empty while (buf.isReadable()) { byte b = buf.readByte(); }
In the first example, we create a ByteBuf instance with a maximum capacity of 1024 bytes and retrieve the capacity using the capacity() method.
In the second example, we use a while loop to write data to the buffer until it reaches its capacity. The isWritable() method returns true if there is space available in the buffer for writing.
In the third example, we read data from the buffer until it is empty. The isReadable() method returns true if there is data available in the buffer for reading.
Overall, the java io.netty.buffer package offers powerful and flexible tools for handling data transfer and manipulation in JAVA applications.
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