JAVA STRING INTERVIEW QUESTIONS AND ANSWERS

String is immutable means that once a String object is created , its value cannot be changed. There are many advantages of Strings being immutable:

A String can be created in two ways in Java: Example: String str=”Giftisincredible”; 2. Using new Keyword : A String can also be created using new keyword. While a String is created using new keyword, it creates a new object in heap memory , even if the same string already exists in the String constant

Java String Pool is a special memory area inside the heap memory that stores unique string objects . Whenever JVM finds a String literal , it first checks whether an identical string already exists in the String constant pool . If the string is already present in the String Constant Pool, then JVM reuses the

String is not a primitive data type . String is a derived data type which is also called reference type because they refer to an object . String class is present in Java.lang package . There are many functions that need to be called upon when processing a string ,such functions are indexOf() , equals()

A String is a non-primitive data type which represent the sequence of characters enclosed in double quotes . String can conrain letters , numbers , spaces , symbols and punctuation . Key characteristics of Java String are Immutability , Memory Optimization and constant pool. String is immutable because once a string object is created ,