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Interview Questions and Answers for 'Redmane technology' - 3 question(s) found - Order By Newest

Very frequently asked. Usually asked in different variants like Diff between StringBuffer , String Builder ; Difference between StringBuilder and String class; Choice between these classes etc.
  Q1. What is the difference between StringBuffer and String class ?Core Java
Anonymous
Ans. A string buffer implements a mutable sequence of characters. A string buffer is like a String, but can be modified. At any point in time it contains some particular sequence of characters, but the length and content of the sequence can be changed through certain method calls.

The String class represents character strings. All string literals in Java programs, such as "abc" are constant and implemented as instances of this class; their values cannot be changed after they are created.

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Related Questions

  Difference between == and .equals() ?
  Why is String immutable in Java ?
  Explain the scenerios to choose between String , StringBuilder and StringBuffer ?

or

What is the difference between String , StringBuilder and StringBuffer ?
  What are different ways to create String Object? Explain.
 How does making string as immutable helps with securing information ? How does String Pool pose a security threat ?
  Why Char array is preferred over String for storing password?
 How is string object immutable if we can concat a string to it ?
  What is StringJoiner ?
 Which of the following is false about main method ?

a. It should be declared public and static
b. it should have only 1 argument of type String array
c. We can override main method
d. We can overload main method
  Which String class does not override the equals() and hashCode() methods, inheriting them directly from class Object?


Very Frequently asked to fresh graduates and less experienced. Favorite question in Walk in drives. Frequently asked in Indian Services companies.
  Q2. Difference between Overloading and Overriding ?Core Java
Anonymous
Ans. Overloading - Similar Signature but different definition , like function overloading.

Overriding - Overriding the Definition of base class in the derived class.

  Sample Code for overloading

  Sample Code for overriding

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Related Questions

  What is the difference between Encapsulation and Abstraction?
  Difference between Composition and Inheritance ?
 What is Polymorphism in Java ?
 Which of the following Java feature promotes access protection or Hiding ?

a. Inheritance
b. Encapsulation
c. Abstraction
d. Composition
  What are the features of encapsulation ?
  How is Abstraction implemented in Java ?
  Difference between Encapsulation and Data Hiding ?
  Difference between Abstraction and Implementation hiding ?
  What are the examples of Abstraction in Java ?


Frequently asked to fresh graduates.
 Q3. What is the difference between yield() and sleep()?Operating System
Anonymous
Ans. When a object invokes yield() it returns to ready state. But when an object invokes sleep() method enters to not ready state.

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   Like      Discuss      Correct / Improve     java   threads   multi threading   yield   sleep   scheduling   operating system     RedMane  Levi9  RedMane Technology  Time      basic        frequent


Related Questions

  Which keyword is used to provide explicit access of a code block to single thread ?

a. Transient
b. Final
c. Explicit
d. Synchronized
  Explain multithreading in Java ?
  Can constructors be synchronized in Java ?
  What is the difference between time slicing and preemptive scheduling ?
  Explain Thread States ?
  Why do we need Thread class even in case we execute thread using runnable interface ?
 If you need to consume messages from the queue faster, which approach will you recommend - batching or concurrency ?
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