Java String Interview Questions
Top Java String Interview Questions
Java String Interview Questions
Java string interview questions often focus on various operations and methods that can be performed on strings in Java. Common topics include how to compare strings, concatenate strings, convert strings to uppercase or lowercase, search for substrings, extract certain characters from a string, and other string manipulation tasks. Interviewers may also ask about the differences between String, StringBuffer, and StringBuilder classes, how strings are stored in memory, and the immutability of strings in Java. It is important for candidates to be familiar with these concepts and able to demonstrate their understanding through examples and explanations during interviews.
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1 - What is a String in Java?
A String in Java is a sequence of characters, represented in the form of objects, that are immutable i.e., their values cannot be changed.
2) What is the difference between String, StringBuilder, and StringBuffer in Java?
String is immutable, meaning once created its value cannot be changed. StringBuilder and StringBuffer are mutable, providing the ability to modify the contents of the string. StringBuilder is not synchronized, while StringBuffer is synchronized which means StringBuffer is thread safe.
3) How to compare two strings in Java?
In Java, you can compare two strings using the equals() method for object level comparison and using the == operator for reference level comparison.
4) What is the difference between == and equals() method in Java?
The == operator is used to compare object references, while the equals() method is used to compare the actual contents of the objects.
5) How to reverse a string in Java?
You can reverse a string in Java by converting the String to a character array, then reversing the order of characters in the array, and finally converting the character array back to a String.
6) What is String immutability in Java?
String immutability means that once a String object is created, its value cannot be changed. Any operation that seems to modify a string actually creates a new string object.
7) Can you give an example of creating a String object in Java?
Sure, you can create a String object in Java using the following syntax:
String str = “Hello, World!”;
8) What is the difference between String pool and heap in Java?
String pool is a pool of unique strings stored in the Java heap memory, which allows efficient memory utilization. The heap is a memory region where objects are stored and is larger than the String pool.
9) How to convert a string to an integer in Java?
You can convert a string to an integer in Java using the parseInt() method of the Integer class or by using the valueOf() method.
10) What is the use of the intern() method in Java?
The intern() method in Java is used to ensure that all strings with the same contents share the same memory location, thereby reducing memory usage for duplicated string literals.
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