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1. Top results related to how are bytes written to the filestream in java code

   • how to identify the java version in which the code is written?

     Top Answer

     Answered Jul 15, 2022 · 9 votes

     How can we identify the version of Core Java/Java EE in which that project was developed?

     (Note that "developed for" and "runs on" are different questions. I am answering the former ... which is what was asked.)

     There is no 100% reliable way to do it.

     • If the project is built using Maven or Gradle, the project's declared dependencies (in the build files) will list specific versions of the Java EE APIs, and (typically) specific Java source and target version.
     • There probably be similar clues in an Ant build file, though in the case of dependencies you will be relying on clues in the pathnames of classpath entries ... which may not be there.
     • For Java EE, there may be clues in the namespace URLs used the XML files; e.g. web.xml , application.xml .
     • If the previous don't help, then you could test compile the codebase with various JDKs and against various Java EE APIs. That should narrow down the range of versions that the codebase is compatible with.
     • If you have existing .class files, then javap can tell you the target bytecode version that was used when building; see this answer. However, this is not a reliable indicator, because it doesn't tell you what version of Java the codebase was developed for.

     If you want to find out which version or versions of Java a project is actually compatible with or actually runs on, the only way to find out for sure is to test it.

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     1/5

   • How are integers cast to bytes in Java?

     Top Answer

     Answered Mar 16, 2010 · 31 votes

     This is called a narrowing primitive conversion. According to the spec:

     A narrowing conversion of a signed integer to an integral type T simply discards all but the n lowest order bits, where n is the number of bits used to represent type T. In addition to a possible loss of information about the magnitude of the numeric value, this may cause the sign of the resulting value to differ from the sign of the input value.

     So it's the second option you listed (directly copying the last 8 bits).

     I am unsure from your question whether or not you are aware of how signed integral values are represented, so just to be safe I'll point out that the byte value 1111 1111 is equal to -1 in the two's complement system (which Java uses).

     Other Answers

     Answered Mar 16, 2010 · 6 votes

     int i = 255;-byte b = (byte)i;-

     So the value of be in hex is 0xFF but the decimal value will be -1.

     int i = 0xff00;-byte b = (byte)i;-

     The value of b now is 0x00. This shows that java takes the last byte of the integer. ie. the last 8 bits but this is signed.

     Other Answers

     Answered Mar 16, 2010 · 4 votes

     or does it just directly copy the last 8 bits of the integer

     yes, this is the way this casting works

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     2/5

   • How to indent a multi-line paragraph being written to the console in java

     Top Answer

     Answered May 23, 2017 · 45 votes

     NOTE: The approach described below does not meet the updated requirements described by @BillMan in the question's comments. This will not automatically wrap lines that are longer than the console line length - only use this approach if wrapping isn't an issue.

     String output = <your string here>String indented = output.replaceAll("(?m)^", "\t");-

     If you're unfamiliar with Java regular expressions, it works as follows:

     • (?m) enables multiline mode. This means each line in output is considered individually, instead of treating output as a single line (which is the default).
     • ^ is a regex matching the start of each line.
     • \t causes each match of the preceding regex (i.e. the start of each line) to be replaced by a tab character.

     As an example, the following code:

     String output = "foo\nbar\nbaz\n"String indented = output.replaceAll("(?m)^", "\t");System.out.println(indented);

     Produces this output:

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     3/5

   • How are the primitive data types in java defined/written?

     Top Answer

     Answered Jul 30, 2018 · 2 votes

     No, there is no such thing as int.java or double.java These low level types are hard-coded at the JVM level. They are primitive types even at byte-code level (e.g. different bytecodes apply to operands of 4 bytes as opposed to 8 bytes, or to integral types as opposed to floating point types). You may want to study the implementation of one or more open source Java VMs to see how they are handled (https://en.wikipedia.org/wiki/List_of_Java_virtual_machines#Free_and_open_source_implementations). Also, even compilers treat them specially and make certain assumptions about them, e.g. for optimization purposes.

     The other reason for them not having equivalent Java classes (unlike the capitalized ones, java.lang.Integer, java.lang.Double etc.) is that they don't have methods of their own, that you can call, for example with the dot notation. When you do use a primitive type as an object, a conversion takes place (known as autoboxing -- https://en.wikipedia.org/wiki/Object_type_(object-oriented_programming)#Autoboxing) where the primitive type is converted to one of the wrapper types, transparently for the programmer. It is worth having a look at the source code of these classes, for some interesting internal functionality.

     Also you cannot create instances of them, by using the new keyword. The compiler or the VM allocate space for them, as necessary, on the stack, as object or class fields, or even directly in the code.

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     4/5

   • How to return to a specific line in the code in java?

     Top Answer

     Answered Nov 14, 2013 · 1 votes

     I need to have a way to return to a specific line of code please, not end the program with .break

     Unfortunately you won't get what you "need" here. Java does not have a goto statement. However, goto's are never required. For example:

     //codeif(condition) goto code

     is the same as

     do { //code} while(condition);

     Any logic that you want is implementable with while/if/for and methods. If you post more code, we may be able to help you figure out what to use.

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     5/5

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2. www.programiz.com › java-programming › fileinputstreamJava FileInputStream (With Examples) - Programiz

   www.programiz.com › java-programming › fileinputstream

   • Cached

   Data in the file: This is a line of text inside the file. In the above example, we have created a file input stream named input. The input stream is linked with the input.txt file. FileInputStream input = new FileInputStream("input.txt"); To read data from the file, we have used the read() method inside the while loop.

3. www.geeksforgeeks.org › java-program-to-writeJava Program to Write Bytes using ByteStream - GeeksforGeeks

   www.geeksforgeeks.org › java-program-to-write

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   Sep 14, 2021 · Java Byte streams are used to perform input and output of 8-bit bytes. To write Bytes using BytesStream to a file Java provides a specialized stream for writing files in the file system known as FileOutputStream. This stream provides the basic OutputStream functionality applied for writing the contents of a file.

4. People also ask

   How to write byte using bytestream to a file in Java?

   • To write Bytes using BytesStream to a file Java provides a specialized stream for writing files in the file system known as FileOutputStream. This stream provides the basic OutputStream functionality applied for writing the contents of a file. FileOutputStream class is an output stream for writing data to a file.

   Java Program to Write Bytes using ByteStream - GeeksforGeeks

   www.geeksforgeeks.org/java-program-to-write-bytes-using-bytestream/

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   How to create a file input stream in Java?

   • It extends the InputStream abstract class. Before we learn about FileInputStream, make sure to know about Java Files. In order to create a file input stream, we must import the java.io.FileInputStream package first. Once we import the package, here is how we can create a file input stream in Java.

   Java FileInputStream (With Examples) - Programiz

   www.programiz.com/java-programming/fileinputstream

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   How do byte streams work?

   • Programs use byte streams to perform input and output of 8-bit bytes. All byte stream classes are descended from InputStream and OutputStream. There are many byte stream classes. To demonstrate how byte streams work, we'll focus on the file I/O byte streams, FileInputStream and FileOutputStream.

   Byte Streams (The Java™ Tutorials > Essential Java Classes - Oracle

   docs.oracle.com/javase/tutorial/essential/io/bytestreams.html

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   What is FileInputStream in Java?

   • The FileInputStream class of the java.io package can be used to read data (in bytes) from files. It extends the InputStream abstract class. Before we learn about FileInputStream, make sure to know about Java Files. In order to create a file input stream, we must import the java.io.FileInputStream package first.

   Java FileInputStream (With Examples) - Programiz

   www.programiz.com/java-programming/fileinputstream

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5. www.codejava.net › java-se › file-ioJava File IO FileInputStream and FileOutputStream Examples

   www.codejava.net › java-se › file-io

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   Jul 28, 2019 · 2. Understanding the FileOutputStream Clas The FileOutputStream is a byte output stream class that provides methods for writing bytes to a file. We can create an instance of this class by supplying a File . or a path name, and/or specify to overwrite or append to an existing file, using the following constructors:

6. stackoverflow.com › questions › 4350084arrays - byte[] to file in Java - Stack Overflow

   stackoverflow.com › questions › 4350084

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   Dec 4, 2010 · 20. From Java 7 onward you can use the try-with-resources statement to avoid leaking resources and make your code easier to read. More on that here. To write your byteArray to a file you would do: try (FileOutputStream fos = new FileOutputStream("fullPathToFile")) {. fos.write(byteArray);

   Usage example

   FileUtils.writeByteArrayToFile(new File("pathname"), myByteArray)

   See more on stackoverflow

7. docs.oracle.com › javase › tutorialByte Streams (The Java™ Tutorials > Essential Java Classes ...

   docs.oracle.com › javase › tutorial

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   Byte Streams. Programs use byte streams to perform input and output of 8-bit bytes. All byte stream classes are descended from InputStream and OutputStream. There are many byte stream classes. To demonstrate how byte streams work, we'll focus on the file I/O byte streams, FileInputStream and FileOutputStream.

8. docs.oracle.com › javase › 8FileInputStream (Java Platform SE 8 ) - Oracle

   docs.oracle.com › javase › 8

   • Cached

   A FileInputStream obtains input bytes from a file in a file system. What files are available depends on the host environment. FileInputStream is meant for reading streams of raw bytes such as image data. For reading streams of characters, consider using FileReader. File, FileDescriptor, FileOutputStream, Files.newInputStream(java.nio.file.Path ...

9. www.programiz.com › java-programming › fileoutputstreamJava FileOutputStream (With Examples) - Programiz

   www.programiz.com › java-programming › fileoutputstream

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   In the above example, we have created a file output stream named output. The file output stream is linked with the file output.txt. FileOutputStream output = new FileOutputStream("output.txt"); To write data to the file, we have used the write() method. Here, when we run the program, the output.txt file is filled with the following content.