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When to use the readAllBytes() method of InputStream in Java 9?
Since Java 9, we can use the readAllBytes() method from InputStream class to read all bytes into a byte array. This method reads all bytes from an InputStream object at once and blocks until all remaining bytes have read and end of a stream is detected, or an exception is thrown.
The reallAllBytes() method can't automatically close the InputStream instance. When it can reach the end of a stream, the further invocations of this method can return an empty byte array. We can use this method for simple use cases where it is convenient to read all bytes into a byte array and not intended for reading input streams with a large amount of data.
Syntax
public byte[] readAllBytes() throws IOException
In the below example, we have created a "Technology.txt" file in a "C:\Temp" folder with simple data: { "JAVA", "PYTHON", "JAVASCRIPT", "SELENIUM", "SCALA"}.
Example
import java.nio.*;
import java.nio.file.*;
import java.io.*;
import java.util.stream.*;
import java.nio.charset.StandardCharsets;
public class ReadAllBytesMethodTest {
public static void main(String args[]) {
try(InputStream stream = Files.newInputStream(Paths.get("C://Temp//Technology.txt"))) {
// Convert stream to string
String contents = new String(stream.readAllBytes(), StandardCharsets.UTF_8);
// To print the string content
System.out.println(contents);
} catch(IOException ioe) {
ioe.printStackTrace();
}
}
}Output
"JAVA", "PYTHON", "JAVASCRIPT", "SELENIUM", "SCALA"
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