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Showing content from https://www.geeksforgeeks.org/quizzes/java-string-classes/ below:

Quiz about Java String Classes

Which of the following is immutable in Java?

What is the key difference between StringBuffer and StringBuilder?

• StringBuffer is thread-safe, StringBuilder is not

• StringBuilder is synchronized, StringBuffer is not

• StringBuffer is immutable, StringBuilder is mutable

• StringBuilder consumes more memory than StringBuffer

Which of the following will compile successfully?

StringBuffer sb = "Hello";

• Only if sb is declared as final

Which class should be used when multiple threads need to modify the same string?

What will be the output of the following code?

String s1 = "Java";
String s2 = s1.concat(" Programming");
System.out.println(s1);

Which of the following methods exists in StringBuffer but not in String?

What will be the output of the following code?

StringBuilder sb = new StringBuilder("Hello");
sb.append(" World");
System.out.println(sb);

Which is the fastest for string modifications in a single-threaded environment?

What happens if multiple threads try to modify a StringBuilder instance?

• It will throw a ConcurrentModificationException

• It may cause unexpected results due to lack of synchronization

• It will execute sequentially

• It will behave the same as StringBuffer

What will be the output of the following code?

StringBuffer sb1 = new StringBuffer("Java");
StringBuffer sb2 = sb1;
sb1.append(" Programming");
System.out.println(sb2);

There are 10 questions to complete.

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