Skip to main content

String & StringBuffer & StringBuilder


**** String ****

-> String is immutable  ( once created can not be changed )object.
   The object created as a String is stored in the  Constant String Pool  .
   Every immutable object in Java is thread safe ,that implies String is also thread safe .
   String can not be used by two threads simultaneously.
   String  once assigned can not be changed.


**** StringBuffer  ***

-> StringBuffer is mutable means one can change the value of the object .
   The object created through StringBuffer is stored in the heap .
   StringBuffer  has the same methods as the StringBuilder ,
   but each method in StringBuffer is synchronized that is StringBuffer is thread safe .

****** StringBuilder ****

-> StringBuilder  is same as the StringBuffer ,
   that is it stores the object in heap and it can also be modified .
   The main difference between the StringBuffer and StringBuilder is that StringBuilder is also not thread safe.
   StringBuilder is fast as it is not thread safe . 

Comments

Post a Comment

Popular posts from this blog

Mockito interview Questions

1.       Question 1. What Is Mockito? Answer : Mockito allows creation of mock object for the purpose of Test Driven Development and Behavior Driven development. Unlike creating actual object, Mockito allows creation of fake object (external dependencies) which allows it to give consistent results to a given invocation. 2.       Question 2. Why Do We Need Mockito? What Are The Advantages? Answer : Mockito differentiates itself from the other testing framework by removing the expectation beforehand. So, by doing this, it reduces the coupling. Most of the testing framework works on the "expect-run-verify". Mockito allows it to make it "run-verify" framework. Mockito also provides annotation which allows to reduce the boilerplate code. 3.       Question 3. Can You Explain A Mockito Framework? Answer : In Mockito, you always check a particular class. The dependency in that class is injected using m...
2 comments
Read more

application.properties vs application.yml vs bootstarp.yml in spring boot

APPLICATION.PROPERTIES: In Spring Boot, configuration details are kept in the  application.properties  file .The application.properties is present under   the classpath(file location src/main/resources ).The basic configuration properties like DB details, server port etc. is present in the   application.properties  file as given below – spring.datasource.url=jdbc:oracle:thin:@manoj:1521:orcl spring.datasource.username=tog spring.datasource.password=sci YAML File: Spring Boot supports YAML based properties configurations to run the application. Instead of  application.properties we can                                                         use  application.yml f...
Post a Comment
Read more

Java Example Program to Convert List to Set

import java.util.ArrayList; import java.util.HashSet; import java.util.Set; public class ListToSet {  /**   * @author Amarjit Kumar   * @category interview questions   *   * Description: Convert List to set in java with example program   *   */  public static void main(String[] args) {   ArrayList<String> arrList= new ArrayList<>();   arrList.add("Java");   arrList.add("Java");   arrList.add("List to String");   arrList.add("Example Program");   Set<String> strSet = new HashSet<String>(arrList);   System.out.println(strSet);   System.out.println(arrList);  } } /*  * Java program to convert list to set. Convert ArrayList of string to HashSet  * in java example program How to convert List to Set in java Set<String> strSet  * = new HashSet<String>(arrList); HashSet having a constructor which will take  * list as an ar...
Post a Comment
Read more