Should FileReader be used to read a Java bytecode (*.class) file? a. No---bytecode files can only be executed, never read.
How to use FileReader in Java?
To use the FileReader in the application, we must first import it from package java.io using the import statement. For creating the instance of FileReader, use one of its constructors. 2.1. Creating FileReader using the name of the file
Which class is used to specify the character encoding of FileReader?
Here, we have used the Charset class to specify the character encoding of the file reader. The FileReader class provides implementations for different methods present in the Reader class.
How to read bytecode?
If you want to see bytecodes, just use javap which comes with the JDK. Show activity on this post. use javap. it's a part of the standard jdk. Show activity on this post. Not sure how it will help you, unless you can read byte code... Show activity on this post. Any binary file editor will do - gHex or xxd are two recommendations.
How to read data from a file in Java?
Java FileReader class is used to read data from the file. It returns data in byte format like FileInputStream class. It is character-oriented class which is used for file handling in java. Let's see the declaration for Java.io.FileReader class: It gets filename in string.
Should FileReader be used to read a Java bytecode eg a class file Which of the following is an appropriate answer?
1 point 13) Should File Reader be used to read a Java byte code (e.g, a. ... No, the bytes in bytecode files are not intended to be interpreted as characters. c. Yes, any file can be read with FileReader under byte-stream class.Nov 18, 2020
How do I use FileReader?
The FileReader class of the java.io package can be used to read data (in characters) from files....Other Methods of FileReader.MethodDescriptionmark()mark the position in file reader up to which data has been readreset()returns the control to the point in the reader where the mark was set1 more row
What class does readLine () belong to?
Java Console classThe readLine(String fmt, Object args) method is a static method of Java Console class. It is used to provide a formatted prompt, then reads a single line of text from the console.
Which method is used to notify the operating system that a file is no longer needed in Java?
Basic Overview. The Object#wait() method is used within a synchronization block or member method and causes the thread it is called in to wait indefinitely until another thread calls Object#notify() (or it's variation Object#notifyAll() ) on the same object that the original Object#wait() was called on.Dec 11, 2018
What is FileReader class in java?
FileReader is a class in the java.io package which can be used to read a stream of characters from the files. This class uses either specified charset or the platform's default charset for decoding from bytes to characters.Feb 9, 2022
How do you read from a file using FileReader class?
import java. io. FileReader; import java. ... class Main.{ public static void main(String[] args){ File file = new File("doc.txt");try (FileReader fr = new FileReader(file)) {char[] chars = new char[(int) file. length()]; fr. read(chars);String fileContent = new String(chars); System. out. ... } catch (IOException e) {More items...
Which of these method of FileReader class is used to read characters from a file?
Online Test72.Which of these method of FileReader class is used to read characters from a file?a.read()b.scanf()c.get()d.getInteger()
What is the use of readLine in Java?
The readLine(String, Object) method of Console class in Java is used to read a single line of text from the console by providing a formatted prompt.Jun 12, 2020
How do you read a Stdin line in Java?
A simple solution is to use the Scanner class for reading a line from System.in . A Scanner breaks its input into tokens using a delimiter pattern, which by default matches whitespace. We can also use StringTokenizer with the Scanner in place of String. split() to split the input as StringTokenizer is much faster.
What is use of File class in Java?
Java File class represents the files and directory pathnames in an abstract manner. This class is used for creation of files and directories, file searching, file deletion, etc. The File object represents the actual file/directory on the disk.
How do I read a file?
First, open a text file for reading by using the open() function. Second, read text from the text file using the file read() , readline() , or readlines() method of the file object....1) open() function.ModeDescription'w'Open a text file for writing text'a'Open a text file for appending text1 more row
What is Java library file?
Libraries in java are essentially packages that contain classes or interfaces, which generally fall under a certain category. These classes or interfaces contain methods which you may be willing to use in your program without having to rewrite the whole method again.Nov 1, 2019
What is a filereader?
FileReader is a class in the java.io package which can be used to read a stream of characters from the files. This class uses either specified charset or the platform’s default charset for decoding from bytes to characters.
What does "read" mean in Java?
read (): The read () method reads and passes a single character or -1 if the stream is ended.
What does getencoding do?
getEncoding (): The getEncoding () is used to return the title of the character encoding which is being used by the stream.
What is charset class?
Charset: The Charset class is used to define methods for producing encoders and decoders and for recovering several names combined with the charset.
What is a filereader in Java?
The FileReader class of the java.io package can be used to read data (in characters) from files. It extends the InputSreamReader class. Before you learn about FileReader, make sure you know about the Java File.
How to create a file reader?
Once we import the package, here is how we can create the file reader. 1. Using the name of the file. FileReader input = new FileReader (String name); Here, we have created a file reader that will be linked to the file specified by the name. 2. Using an object of the file. FileReader input = new FileReader (File fileObj);
What is read in a char array?
read (char [] array, int start, int length) - reads the number of characters equal to length from the reader and stores in the specified array starting from the position start
What is the method to specify the type of character encoding?
Note: We have used the Charset.forName () method to specify the type of character encoding. To learn more, visit Java Charset (official Java documentation).
What is data in a file?
Data in the file: This is a line of text inside the file.
Where is input.txt file?
Note: The file input.txt should be present in the current working directory.
Does input1 specify character encoding?
input1 does not specify the character encoding. Hence the getEncoding () method returns the default character encoding.
Example 1: Read using FileReader
In this example, we are calling the read () method of FileReader class to read the data from the file, this method reads the one character at a time and returns its ASCII value in the integer format. To print the actual data we must typecast it to the char.
Example 2: Read Using FileReader
In the following example, we are reading the data from the file. Firstly we created a FileReader after that using the read () method we are reading each character and print it on the console.
Conclusion
In this tutorial, we learned about the read () method of FileReader class in Java, which is used to read a single character and return it in the form of an integer value, in the range of 0 to 65535 and returns -1 if the end of the stream has been reached.
