Java Interview Questions On Strings
Top Java Interview Questions on Strings
Java Interview Questions On Strings
In Java interviews, candidates often face questions related to strings, which are a fundamental part of the language. Basic questions may cover concepts like the difference between String, StringBuilder, and StringBuffer, how to compare strings using == and equals(), and the significance of the String Pool. Advanced questions may delve into topics like immutability, string manipulation using methods like substring() and concat(), and efficient ways to perform string concatenation. It is crucial for candidates to have a strong understanding of these concepts and be able to articulate their knowledge effectively during the interview.
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1 - What is the difference between String and StringBuffer in Java?
String class in Java is immutable, meaning its value cannot be changed once it is created. On the other hand, StringBuffer is mutable, allowing you to modify its contents. Thus, if you need to perform a lot of string manipulations, it is more efficient to use StringBuffer.
2) Explain the difference between == and equals() method when comparing strings.
The == operator in Java compares the memory address of two objects, while the equals() method compares the actual contents of the objects to determine if they are equal. Therefore, when comparing strings for equality, it is recommended to use the equals() method.
3) How can you reverse a string in Java?
One simple way to reverse a string in Java is to use the StringBuilder class and its reverse() method. For example:
String originalString = “hello”;
StringBuilder reversedString = new StringBuilder(originalString).reverse();
String result = reversedString.toString();
This will reverse the original string and store the result in the ‘result’ variable.
4) Explain the significance of the String Pool in Java.
The String Pool in Java is a special memory area where string literals are stored. When you create a string using double quotes, Java first checks if the string already exists in the String Pool. If it does, the existing reference is returned, saving memory. This helps increase the efficiency of handling strings in Java programs.
5) How can you check if a string is a palindrome in Java?
To check if a string is a palindrome in Java, you can compare the original string with its reversed version. If they are equal, the string is a palindrome. Here is a sample code snippet to check for a palindrome:
String originalString = “madam”;
String reversedString = new StringBuilder(originalString).reverse().toString();
boolean isPalindrome = originalString.equals(reversedString);
If isPalindrome is true, then the original string is a palindrome.
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