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Author: admin | Category: Electronic Piano | 24.07.2016

To illustrate the concept of nested for loop, let us consider a program to generate a pyramid of numbers. On second iteration (pass) of outer loop, when i=2 then the inner loop executes 2 times and thus displaying value of i (i.e. Connect Us On FaceBook and Google+Dinesh Thakur is a Technology Columinist and founder of Computer Notes and Technology Motivation. I am trying to show the android keyboard which shows only numbers and a decimal point it works fine in devices like Lenovo but it doesn't works in devices like Samsung. Not the answer you're looking for?Browse other questions tagged java android keyboard or ask your own question. How do we know that our genetic similarities to other species is actually due to common ancestry? I am working on my Java IDE project in which i want to compile and run java files using runtime.
What is a word that means "something that is commonly known, but not commonly talked about"? Why did Hogwarts Library carry a book containing information on horcruxes if it was a banned subject?
Read from the opened input stream until "end-of-stream" encountered, or write to the opened output stream (optionally flush the buffered output).
The abstract superclass InputStream declares an abstract method read() to read one data-byte from the input source, and convert the unsigned byte value (of 0 to 255) to an int.
Two variations of read() methods are implemented in the InputStream for reading a block of bytes into a byte-array buffer.
Similar to the input counterpart, the abstract superclass OutputStream declares an abstract method write() to write a data-byte to the output sink. Both the InputStream and the OutputStream provides a close() method to close the stream, which performs the necessary clean-up operations as well as frees the system resources. The IO streams are often layered or chained with other IO steams, for purposes such as buffering, filtering or format conversion. To chain the streams together, simply pass an instance of one stream into the constructor of another stream. The first example copies a file by reading a byte from an input file and writing it to the output file. Instead of InputStream and OutputStream, Reader and Writer shall be used for character-based IO. The abstract superclass Writer similarly declares an abstract method write(), to write a character to the output sink. Object serialization is the process of representing a particular state of an object in a serialized bit-stream, so that the bit stream can be written out to an external device (such as a disk file or network).


The writeObject() method writes out the class of the object, the class signature, and values of non-static and non-transient fields. The optional argument_position specifies the position of the argument in the argument list. The optional precision restricts the number of characters (or number of decimal places for float-point numbers). Flag: '-' (left-justified), '+' (include sign), ' ' (include leading space), '0' (zero-padded), ',' (include grouping separator). Notice that the method format() has the same syntax as the method printf(), using the same set of format specifier as printf().
Disk Buffer is RAM that is built into the disk drive to store a block of data from the disk. OS Buffer: OS does its own buffering as it can cache more data and manage it more elegantly. Channel represents a connection to a physical IO device, such as file, network socket, or even another program.
All the byte streams are derived from the abstract superclass InputStream and OutputStream, as illustrated in the above class diagram. Hence, it has to differentiate between byte-based IO (for binary data), and character-based text IO. You can use a file pointer (of type long), similar to array index, to access individual byte or group of bytes in primitive types (such as int and double).
The classes GZIPInputStream and GZIPOutputStream (in package java.util) support reading and writing of compressed data in GZIP format. Varargs was introduced in JDK 1.5 (that is the reason Java cannot support printf() earlier). For examples: 'b', 'B' (boolean), 'h', 'H' (hex string), 's', 'S' (string), 'c', 'C' (character), 'd' (decimal integer), 'o' (octal integer), 'x', 'X' (hexadecimal integer), 'e', 'E' (float-point number in scientific notation), 'f' (floating-point number), '%' (percent sign).
The cost of transferring data from the disk surface to the disk buffer is by far the slowest and the most expensive operation, bacuase it involves physical movement of the disk.
There is no restriction on the level of nesting of loops but one should take care while nesting at multiple levels otherwise unexpected results may arise. A stream is a sequential and continuous one-way flow of information (just like water or oil flows through the pipe). Notice that most the IO methods "throws" IOException, which must be caught by the program or declared to be thrown to the calling method. This program took only 3 millisecond - a more than 1000 times speed-up compared with the previous example.
The program took 62 milliseconds, about 60 times speed-up compared with example 1, but slower than the programmer-managed buffer.


When character stream is used to read an 8-bit ASCII file, an 8-bit data is read from the file and put into the 16-bit char location of the Java program. Read "Data Representation: Character Encoding" for details about Unicode character set and Unicode encoding. Object serialization is necessary to save a state of an object into a disk file for persistence or sent the object across the network for applications such as Web Services, Distributed-object applications, and Remote Method Invocation (RMI). Furthermore, they are all sequential access streams, meant for reading and writing data sequentially. As illustrated from the above diagram, many layers of cache exist between you Java application and physical disk.
Because channels have a closer ties to the underlying platform, they can achieve better IO throughput. You can run the above example on a 8-bit ASCII text file and a 16-bit Unicode text file and observe the result. It is sometimes necessary to read a file record directly as well as modifying existing records or inserting new records. It advances automatically for every read and write operation by the number of bytes processed. It first breaks the text inputs into tokens using a delimiter pattern, which is by default whitespace (blank, tab and newline).
Xxx includes all primitive types (byte, short, int, long, float, double and boolean), BigInteger and BigNumber. However, method close() also throws an IOException, and therefore must be enclosed inside a nested try-catch block (which makes the codes a little ugly). The class RandomAccessFile provides supports for non-sequential, direct (or random) access to a disk file. RandomAccessFile is a two-way stream, supporting both input and output operations within the same stream. The Java program receives data from data source by opening an input stream, and sends data to data sink by opening an output stream. If your program needs to perform both input and output, you have to open two separate streams - an input stream and an output stream.



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