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Java String FAQs or Interview Questions
A list of top Java String FAQs (Frequently Asked Questions) or interview questions are given below. These questions can be asked by the interviewer.
1) How many objects will be created in the following code?
String s1="tutoraspire"; String s2="tutoraspire";
Answer: Only one.
2) What is the difference between equals() method and == operator?
The equals() method matches content of the strings whereas == operator matches object or reference of the strings.
3) Is String class final?
Answer: Yes.
4) How to reverse String in java?
Input:
this is TutorAspire
Output:
tnioptavaj si siht
5) How to check Palindrome String in java?
Input:
nitin
Output:
true
Input:
jatin
Output:
false
6) Write a java program to capitalize each word in string?
Input:
this is TutorAspire
Output:
This Is TutorAspire
7) Write a java program to reverse each word in string?
Input:
this is TutorAspire
Output:
siht si tnioptavaj
8) Write a java program to tOGGLE each word in string?
Input:
this is TutorAspire
Output:
tHIS iS TutorAspire
9) Write a java program reverse tOGGLE each word in string?
Input:
this is TutorAspire
Output:
sIHT sI tNIOPTAVAJ
10) What is the difference between String and StringBuffer in java?
11) What is the difference between StringBuffer and StringBuilder in java?
12) What does intern() method in java?
13) How to convert String to int in java?
14) How to convert int to String in java?
15) How to convert String to Date in java?
16) How to Optimize Java String Creation?
17) Java Program to check whether two Strings are anagram or not
18) Java program to find the percentage of uppercase, lowercase, digits and special characters in a String
19) How to convert String to Integer and Integer to String in Java
20) Java Program to find duplicate characters in a String
21) Java Program to prove that strings are immutable in java
22) Java Program to remove all white spaces from a String
23) Java Program to check whether one String is a rotation of another
24) Java Program to count the number of words in a String
25) Java Program to reverse a given String with preserving the position of space
26) How to swap two String variables without third variable
27) How to remove a particular character from a String
Next TopicHow to reverse String in Java.