Core Java - Interview Questions and Answers for 'Reader' | Search Interview Question

Core Java - Interview Questions and Answers for 'Reader' - 6 question(s) found - Order By Newest

Q1. What is the difference between the Reader/Writer class hierarchy and the InputStream/OutputStream class hierarchy?

Core Java

Ans. The Reader/Writer class hierarchy is character-oriented, and the InputStream/OutputStream class hierarchy is byte-oriented

Sample Code for InputStream

Sample Code for OutputStream

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Q2. Which class is used to read streams of characters from a file?

Core Java

Ans. FileReader

Sample Code for FileReader

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Q3. Name few Reader classes ?

Ans. http://www.buggybread.com/2015/01/java-input-reader-classes-and-interfaces.html

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Q4. Difference between Scanner and BufferedReader ? Which one is faster and Why ?

Core Java

Ans. Scanner is used for parsing tokens from the contents of the stream while BufferedReader just reads the stream.

BufferedReader read files efficiently by using a buffer to avoid physical disk operations.

Buffer size of Scanner is usually smaller than the Buffered Writer.

BufferedReader is faster that Scanner as it just reads the Stream and doesn't Parse the tokens to read the stream into primitive data types.

Sample Code for Scanner

Sample Code for BufferedReader

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Q5. How does encoding affect using Reader / writer classes or Stream classes in Java ?

Core Java

Ans. Which group of bytes represent which character is defined by character encoding. So when reading character by character from a stream of bytes using Reader, specifying character encoding becomes significant as the same group of bytes can represent different character in different character encoding(Eg UTF-8 and UTF-16 etc.)

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Q6. Write a program that reads file using FileReader and BufferedReader

Core Java

Ans. File file = new File("/home/sample.txt");
FileReader fileReader = new FileReader(file);
BufferedReader bufferedReader = new BufferedReader(fileReader);
while ((line = bufferedReader.readLine()) != null) {
System.out.println(line);
}

Sample Code for import java.io.BufferedReader; import java.io.File; import java.io.FileReader;

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