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As we haven't specified the type of TreeSet, it being evaluated with the first element insertion. Once it's identified that it's of type String and as no comparator has been defined, the comparison is done using the String compareTo method. String compareTo method compares the elements by the content / value.
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Ans. float is a native data type whereas Float is a class. A Float object will always take more memory than float variable as there are metadata overheads with the objects.
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Q717. Difference between HashMap and WeakHashMap ?
Ans. WeakHashMap uses weak reference for keys, which means if the key object doesn't have any reference then both key/value mapping will become eligible for garbage collection.
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Q720. When are static and instance methods resolved ? During compile time or Runtime ?
Ans. Static methods are resolved during compile time and hence they cannot participate in runtime polymorphism. Instance methods are resolved during runtime.
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Q726. Have you used Kafka in your project ? If Yes, for what ?
Ans. We were using Kafka as a replacement for JMS Message Queue for better throughput. We were just using a simple Java multi threaded client as order of message consumption didn't matter to us.
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Q730. Which is of the following is NOT TRUE for JVM ?
a. JVM reads Byte Code and generates Machine Code. b. JVM is a virtual Machine that acts as a intermediary between Java Application and Host Operating System. c. JVM reads Source Code and generates Byte Code. d. JVM acts as a translator that translates different Machine code ( on the basis of Host Machine ) for a common Byte Code.
Ans. JVM reads Source Code and generates Byte Code.
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a. HashMap came before HashTable. b. HashMap allows null values whereas Hashtable doesn’t allow null values. c. HashTable and HashMap allow Key-Value pairs. d. Hashtable is synchronized whereas HashMap is not.
Ans. HashMap came before HashTable.
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Q737. Which of the following is not the use of this keyword ?
a. Passing itself to another method b. To call the static method c. Referring to the instance variable when local variable has the same name d. Calling another constructor in constructor chaining
Ans. To call the static method
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Which of the following is not type of inner classes ?
