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Java / Concurrent collections

Difference between ConcurrentHashMap and HashMap.

ConcurrentHashMap is thread safe while HashMap is not.

ConcurrentHashMap does not allow NULL key or value while HashMap allows one null key.

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Explain concurrent collection API. List some of the concurrency collection interfaces. Explain BlockingQueue in Java concurrent collections. I have one List of Map like - List> list = new ArrayList>(); I want to return the Key if any value passed by user is equal to the value present in Map using Java 8 . One way to doing is - Map data = new HashMap<>(); list.stream().forEach(map -> { data.putAll(map.entrySet().stream() .collect(Collectors.toMap(entry -> entry.getKey(), entry -> (String) entry.getValue()))); }); String result = data.entrySet().stream() .filter(map -> "def".equals(map.getValue())) .map(map -> map.getKey()) .collect(Collectors.joining()); But I want to do to it without using collect(). Please help me on that. Thank you. What are the 4 forms of BlockingQueue methods? Does BlockingQueue supports removal of arbitrary element? Is BlockingQueue implementations are thread safe? Define poison pill or object in Java collections. What does drainDo method in BlockingQueue do? List the implementations of BlockingQueue. Does BlockingQueue allow null elements? Explain ArrayBlockingQueue in Java concurrency collections. What is Bounded buffer? Explain DelayQueue in Java Concurrent collections. Explain LinkedBlockingQueue in Java concurrent collections. Explain PriorityBlockingQueue in Java concurrency collections. Difference between ArrayBlockingQueue and LinkedBlockingQueue. Difference between synchronizedMap and ConcurrentHashMap in Java. Why does ConcurrentHashMap does not allow null key or values? Can we use ConcurrentHashMap in a single threaded application? Difference between Hashtable and ConcurrentHashMap in Java. What is High throughput computing? Difference between ConcurrentHashMap and HashMap. Explain SynchronousQueue in Java concurrent collections. What is shutdown hook in Java Thread? Difference between Runnable and Callable in Java Thread. How to stop a running thread in Java? Why is Thread.stop deprecated? Why are Thread.suspend and Thread.resume deprecated? Difference between findMonitorDeadlockedThreads and findDeadlockedThreads in Java ThreadMXBean. Define ownable synchronizer in Java thread. Explain ThreadMXBean in Java. Design patterns used in Java multithreading. Is final field initialized in constructor thread-safe? Difference between submit and execute method with ThreadPoolExecutor. If a synchronized method calls another non-synchronized method, is there a lock on the non-synchronized method? What is defensive copying in Java? What is Program counter? What is Java Shutdown Hook? When to use FixedThreadPool in Java? Advantages of immutable objects in multithreaded environment. Difference between LinkedBlockingQueue and ConcurrentLinkedQueue in Java. How to make sure the overrided method is also synchronized in Java? Explain ConcurrentHashMap in Java. Is ConcurrentHashMap thread-safe in Java? Can multiple threads read from ConcurrentHashMap at same time? How ConcurrentHashMap works internally? How does ConcurrentHashMap achieve thread-safety? How to atomically update a value in ConcurrentHashMap? Is Iterator of ConcurrentHashMap fail-safe or fail-fast? What is Spliterator in Java 8? What is reactive streaming in Java9? Why reactive programming is preferred? Explain stream pipelining in Java 8. How does CopyOnWriteArrayList internally works in Java? Difference between ConcurrentSkipListMap and ConcurrentHashMap.

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Java Serialization

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OOPS Concepts and its implementation in Java 18 Inheritance 29 Java Identifiers 4 JDK, JRE, JVM, JIT 69 Object, Class and Package 44 Variable 9 Class Variables (Static Variables) 13 Instance Variables (Non Static Variables) 3 Local Variables 6 Operators 9 Package 10 Data types 10 Modifiers 29 Methods 38 Control Statements 12 Access Modifiers 5 Constructor 38 Interface 46 Abstract Class 19 Enum 20 Arrays 11 Strings 32 Using String 29 Exception 55 Collections 56 List and its implementations 22 Map and its implementations 36 Set and its implementations 23 Queue and its implementations 4 Regular expressions 3 Design Patterns 75 Generics 20 Casting 5 volatile 13 Java ThreadLocal 10 Java Multithreading 113 Java Multithreading part II 17 final keyword 13 static keyword 16 Concurrent collections 55 Java Serialization 36 JDBC 53 JNDI 17 RMI 6 JAXB 10 JMX 9 log4j 18 Annotations 10 XML 14 Garbage collection 31 Programs 8 JVM 4 Java8 streams 25 JavaFX 6 Autosys 9

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