Java 11 Interview Questions and Answers
Prepare for your Interview today!
It supports the latest Unicode version, particularly in the classes below:
Java Flight Recorder (JFR) is a profiling tool that collects data about events during the execution of a Java application in Java Virtual Machine (JVM). JFR is integrated into the JVM and part of the JDK distribution.
javac -d out -sourcepath src/com/withoutbook/flightrecorder/FlightRecTest.java
Once compilation is successful, the following options can be taken to start the program:java -XX:+UnlockCommercialFeatures -XX:+FlightRecorder -XX:StartFlightRecording=duration=200s,filename=recording.jfr -cp ./out/ com.withoutbook.flightrecorder.FlightRecTest
jcmd 4532 JFR.start duration=70s filename=recording.jfr
Below commands relevant to Java Flight Recorder are://Start a recording.JFR.start//It check the status of all recordings running for the specified process, including the recording file name, identification number, duration.JFR.check//It stop recording with a specific identification number, by default, recording 1 is stopped.JFR.stop//It dump the data collected by the recording with a specific identification number, by default, data from recording 1 is dumped.JFR.dump
Java 11 has Implement the ChaCha20 and ChaCha20-Poly1305 ciphers.
ChaCha20 is a new stream cipher which replaces the older, insecure RC4 stream cipher.
Poly1305 is a cryptographic Message Authentication Code (MAC), used on both Encrypted and Decrypted messages, it creates the authentication token and guarantees the integrity of the message.
In ChaCha20-Poly1305 algorithm, ChaCha20 Stream cipher performs the Encryption and Poly1305 performs the Authentication. The ChaCha20 and ChaCha20-Poly1305 algorithms will implement the javax.crypto.CipherSpi API within the SunJCE provider.
It enhances the Java launcher to run the program provided as a single Java source code file, including the use of "shebang" files and related techniques from within the script.
It provides a way to get information from the JVM about Java object heap allocations that:
Most helpful rated by users: