Get JDK 1.4 Tutorial PDF

By Gregory M. Travis

ISBN-10: 1930110669

ISBN-13: 9781930110663

This advisor to JDK 1.4 offers a whole reference application and is the reason and illustrates using the APIs. It offers pointers on transitioning to the strategies of model 1.4.

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In some operating systems, this means that no copying is necessary for reading and reduce copying of data in direct writing data—the data is transferred directly to and buf fers. These buf fers should from the disk. reside as close to the operating system as possible, to reduce the number of copying steps as much as possible. You might be tempted to allocate all buffers as direct buffers, but this would be a bad idea. Direct buffers should only be used for buffers that will actually benefit from the speed increase.

6 we’ll learn how to use the other types of buffers. NOTE Since the ByteBuffer is by far the most common, and most important, of the buffer classes, we will assume that any buffer we are talking about is a ByteBuffer unless otherwise specified. 3 Reading from a channel Now that we’ve seen how to create a buffer, we’ll see how we can read from a channel into a buffer. io package. read() method allowed you to read a number of bytes into an array all at once. In a sense, this approach to using streams is the precursor to the channel-oriented method of the New I/O API.

Note that you have two buffers here, each with its own position, limit, and capacity values. Suppose, for example, you wanted to read a series of floating-point values from a channel: you could read from the channel into the ByteBuffer, and then read the floats from the FloatBuffer. Since these two buffers point to the same data, the floating-point values in the FloatBuffer are made up of the bytes in the ByteBuffer. print( floatArray[i]+" " ); } It’s important to remember that the position and limit values of the two buffers are independent of each other.

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JDK 1.4 Tutorial by Gregory M. Travis

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