Tag: programming languages

Questions Related to programming languages

These classes are defined in separate files. Will this code compile successfully? package dir1; class Parent { public java.util.Set set; } package dir2; class Child extends dir1.Parent { void test() { set.add("Hello"); } }
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  1. True

  2. False

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Correct Option: A

For concatenation of strings, which method is good, StringBuffer or String

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  1. String

  2. StringBuffer

  3. Both

  4. None

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Correct Option: B

For concatenation of strings, which method is good, StringBuffer or String

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  1. String Buffer

  2. String

  3. both

  4. none

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Correct Option: A

The following are used for Thread communication

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  1. wait,notify,notifyall

  2. wait,notify,notifyall,sleep

  3. Yield,sleep

  4. yield, sleep, wait

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Correct Option: A

Java provide ______ construct to find out the size of an object

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  1. sizeOf ()

  2. size()

  3. getSize()

  4. No such method in java to find size of an object directly.

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Correct Option: D

modifiers that allowed for methods in an Interface

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  1. public, abstract

  2. abstract, final

  3. final

  4. public

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Correct Option: A

What is "delete" in java?

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  1. a Keyword

  2. a method

  3. a special identifier

  4. none

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Correct Option: D

Differences between Value types and Reference types

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  1. Value type variables are stored on stack. Reference type variables are stored on heap.

  2. Value type holds the data directly, Reference type points to the location that holds the data.

  3. Value type cannot contain null value. Reference type can contain null value.

  4. A new type cannot be derived from value type. A new type can be derived from reference type.

  5. All of the above

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Correct Option: E

Which of the following is value type

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  1. string

  2. class

  3. delegate

  4. struct

  5. interface

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Correct Option: D

what is the difference between indexer and property
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  1. An indexer is always an instance member, but a property can be static also.

  2. A property is always an instance member, but An indexer can be static also.

  3. Indexers can not be participate in inheritance, properties can also participate in inheritance

  4. No difference

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Correct Option: A