Vidushi Infotech Software Trainee Interview Questions and Answers

All basic programming questions

Q1. Q1. What is the difference between “==” and “equals(…)” in comparing Java String objects? A1. When you use “==” (i.e. shallow comparison), you are actually comparing the two object references to see if the...read more
Ans. 
The '==' operator compares object references, while 'equals(...)' compares the content of Java String objects.
• Using '==' checks if two object references point to the same memory location.

• 'equals(...)' compares the actual content of the strings.

• Example: String str1 = "Hello"; String str2 = new String("Hello"); str1 == str2 returns false, but str1.equals(str2) returns true.
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Q2. Q3. Why String class has been made immutable in Java? A4. For performance & thread-safety. 1. Performance: Immutable objects are ideal for representing values of abstract data (i.e. value objects) types l...read more
Ans. 
String class is immutable in Java for performance and thread-safety.
• Immutable objects are ideal for representing values of abstract data types

• Optimization strategies like caching of hashcode, caching of objects, object pooling, etc can be easily applied to improve performance

• String pooling would not be possible if Strings were mutable

• Immutable objects are thread-safe by nature
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