In Java, a String is an object that represents a sequence of characters. Java provides the String class in the java.lang package with powerful methods for text processing, making it a fundamental part of programming with Java.
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Which class is used to create string objects in Java?
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Question 2 of 15
2. Question
What is the default value of a String variable in Java?
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Question 3 of 15
3. Question
Which of these methods returns the length of a string?
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Question 4 of 15
4. Question
What will str1 == str2 return if both are created using new String(“Java”)?
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Question 5 of 15
5. Question
What does equals() method compare in strings?
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Question 6 of 15
6. Question
Which method is used to concatenate two strings?
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Question 7 of 15
7. Question
Are strings in Java mutable or immutable?
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Question 8 of 15
8. Question
What does the substring(int beginIndex, int endIndex) method return?
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Question 9 of 15
9. Question
What is the output of “Hello”.charAt(1)?
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Question 10 of 15
10. Question
What does trim() method do?
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Question 11 of 15
11. Question
What is the result of “abc”.compareTo(“abd”)?
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Question 12 of 15
12. Question
Which string method checks whether a string contains a specific sequence?
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Question 13 of 15
13. Question
What will be the result of “Java”.toUpperCase()?
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Question 14 of 15
14. Question
Can we use + operator to concatenate strings?
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Question 15 of 15
15. Question
Which class should be used for mutable strings in Java?
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Summary
Java Strings are immutable objects that store sequences of characters. With methods like length(), equals(), substring(), and concat(), the String class supports efficient text manipulation and plays a crucial role in Java applications.
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