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Why does a character in Java take twice as much space to store as a character in C?
Different languages use different size types for different reasons. In this case, the difference is between ASCII and Unicode. Java characters use 2-bytes to store a Unicode character so as to allow a wider variety of characters in strings, whereas C, at least by default, only uses 1 byte to store a character.
What is the difference between File Reader and FileInputStream in java?
FileReader used to read the character stream in the file.i.e a file that contanis only the character means FileReader is the choice to read the file.On the other hand if the file contains image,byte like raw data format means FileInputStream is the choice to read the data in the file,.
How many no of instructions does the java byte code has?
200 instructions only.
How many character in 1 KB?
1 Kb is 1024 bytes and 1 character takes 1 byte of the main memory. So, it is 1024 chars in 1 Kb. The preceding is only true for languages which have 8-bit characters. Most modern computer languages support the concept of Unicode, which allows for character encodings in various languages. The most widespread Unicode encoding format is UTF-8, which uses between 1 and 4 bytes to represent a specific character symbol. For instance, the Java programming language assumes all characters are in Unicode UTF-16 format, which is a 16-bit character encoding. So, in Java, only 512 characters will fit in 1 kB.
What is character in java?
A character, or char, is single letter such as 'a'. It's a primitive data type, like int and long, and the letter is always put inside single quotes ' '. The class String, which is used for storing sentences, is made up of a whole bunch of char's put together.
How many KB in one character?
A character in ASCII format requires only one byte and a character in UNICODE requires 2 bytes.
Why does a character in Java take twice as much space to store as a character in C?
Different languages use different size types for different reasons. In this case, the difference is between ASCII and Unicode. Java characters use 2-bytes to store a Unicode character so as to allow a wider variety of characters in strings, whereas C, at least by default, only uses 1 byte to store a character.
How many characters is one byte?
Long long time ago a character was only one byte. Now (unicode) a character is 2 or 4 bytes, but usually we use a variable-length encoding called utf-8.
What is the difference between File Reader and FileInputStream in java?
FileReader used to read the character stream in the file.i.e a file that contanis only the character means FileReader is the choice to read the file.On the other hand if the file contains image,byte like raw data format means FileInputStream is the choice to read the data in the file,.
How many no of instructions does the java byte code has?
200 instructions only.
How many character in 1 KB?
1 Kb is 1024 bytes and 1 character takes 1 byte of the main memory. So, it is 1024 chars in 1 Kb. The preceding is only true for languages which have 8-bit characters. Most modern computer languages support the concept of Unicode, which allows for character encodings in various languages. The most widespread Unicode encoding format is UTF-8, which uses between 1 and 4 bytes to represent a specific character symbol. For instance, the Java programming language assumes all characters are in Unicode UTF-16 format, which is a 16-bit character encoding. So, in Java, only 512 characters will fit in 1 kB.
How is java byte code is different from other low level language?
Java byte-code is the code which generate after the compilation of .java file.And this code is only understand by JVM(java virtual machine ) which understand it and execute it.In other languages this type of functionality is not available.
Define byte offset?
A byte offset, typically used to index into a string or file, is a zero-based number of bytes. For example, in the string "this is a test", the byte offset of "this" is 0, of "is" is 5,"a" is 8, and "test" is 10.Note that this is not always the same as the "character offset". Some characters, such as Chinese ideograms, require two or more bytes to represent. Using ASCII characters only will ensure that the byte offset is always equal to the character offset.
Why it is not possible to execute java program on machine which does not have JVM installed on it?
when a java program is compiled it is converted into a non executable code which is byte code, and this byte code can only be interpreted by JVM. so a java program can't be executed on a machine which doesn't have JVM installed on it.
How much memory does it take to store the letter A?
You can store any of the 127 characters in the ASCII table using just 7 bits. The letter A has character code 65 (0x41) in all ASCII code pages. The code simply maps to the character's glyph in the current code page so you're not actually storing the letter, you are only storing its code. On most systems, the smallest unit of storage is a byte which is typically 8 bits long. The 8th bit is used to determine whether the character is in the standard ASCII character set (0 to 127) or the extended ASCII character set (128 to 255). Only the standard character set is guaranteed to be the same on all systems (the glyphs may vary in style but always represent the same character). The extended character set varies depending on which code page is current. If using UNICODE wide-characters, the character code will consume 2 or 4 bytes. On Windows, it is always 2 bytes. But if using multi-byte character encoding or standard ASCII, it is always 1 byte,
What is character in java?
A character, or char, is single letter such as 'a'. It's a primitive data type, like int and long, and the letter is always put inside single quotes ' '. The class String, which is used for storing sentences, is made up of a whole bunch of char's put together.
Can the Java Virtual Machine execute only Java byte code?
Yes. Note, however, that does not limit the language in which a program is written to Java. There are a number of languages designed to run in the JVM and the number is growing. See https://en.wikipedia.org/wiki/List_of_JVM_languagesfor reference.
