JAVA STRING INTERVIEW QUESTIONS AND ANSWERS

You should avoid using the + operator for string concatenation inside loops because it triggers excessive memory consumption and quadratic O(n^2) time complexity. As Strings are immutable , they cannot be modified in place . Every single + operation copies the entire existing string into a brand-new memory location . Instead of using + in […]

Yes, Strings can be garbage collected in Java. The eligibility for garbage collection of Strings in Java completely depends on how they were created. If Strings are created dynamically at runtime such as using the new keyword , concatenating non-constant strings or reading data from a file , those strings occupy memory in heap memory

In Java, String Interning is a memory optimization technique which ensures all distinct string values share a single copy in a specific memory region called the String Constant Pool. The intern() method is used for interning in Java. When str.intern() method is called , the JVM performs the following tasks : Example : String s1=”Gift”;

Yes, In Java String is Thread-Safe. The main reason for thread-safety of String is immutability of String . Once String object is created , its character sequence and internal state cannot be modified or altered . Threads can only read from a String object but never write to it , so there is no risk

In Java == is a relational operator , whereas equals() is a method of String class. The == operator compares object references , whereas the .equals() method compares the actual text content present inside the string objects. The == operator can be used to compare primitive values like int or char, whereas equals() method cannot

String object of string class are stored in Heap memory, not in stack area. Let’s go deep into this topic. String object can be created in two ways i.e. 1. By using string literal 2. By using the ‘new’ keyword String literal is created by using a double quote. While creating a string using string

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()