UrbanPro
Login Ask & Answer Success Stories Paid Courses Free Classes Tuition & Classes Fees Write a Review All Categories Help Center
Post your Learning Need Signup as a Tutor
✕

Popular Cities

Bangalore

Hyderabad

Delhi

Mumbai

Chennai

Pune

Kolkata

Gurgaon

Ahmedabad

Jaipur

Noida

✕

Learn Java Training from the Best Tutors

  • Affordable fees
  • 1-1 or Group class
  • Flexible Timings
  • Verified Tutors

Book a Free Demo

Java > Learn Java > Hi, Can anyone help me on below queries? 1. What makes...
✕

Search in

Hi, Can anyone help me on below queries? 1. What makes a class as "Thread safe class" ? 2. equals() method uses 3. Difference between String vs StringBuffer ?

Asked by Last Modified  

26 Answers

Learn Java

Follow 0
Answer

Please enter your answer

Java/J2EE, B.E./B.Tech/MCA SubjectsTraining

There are three ways to construct thread-safe Java class which has some state: 1. Make it truly immutable 2.Make field volatile. 3.Use a synchronized block
Comments
Dislike Bookmark

Java/J2EE, B.E./B.Tech/MCA SubjectsTraining

equals() method compares string to the specified object. The result is true if and only if the argument is not null and is a String object that represents the same sequence of characters as this object. public boolean equals(Object anObject)
Comments
Dislike Bookmark

Java/J2EE, B.E./B.Tech/MCA SubjectsTraining

String vs StringBuffer : 1) Mutability: String is immutable (Once created, cannot be modified) while StringBuffer is mutable (can be modified). 2) Performance: While performing concatenations you should prefer StringBuffer over String because it is faster. The reason is: When you concatenate strings...
read more
String vs StringBuffer : 1) Mutability: String is immutable (Once created, cannot be modified) while StringBuffer is mutable (can be modified). 2) Performance: While performing concatenations you should prefer StringBuffer over String because it is faster. The reason is: When you concatenate strings using String, you are actually creating new object every time since String is immutable. read less
Comments
Dislike Bookmark

String objects are immutable in java while in StringBuffer objects u can make changes like insert ,delete or append characters
Comments
Dislike Bookmark

String objects are immutable in java while in StringBuffer objects u can make changes like insert ,delete or append characters
Comments
Dislike Bookmark

1.Defining the threading model for your application is probably the most important step you can take into making your code thread safe.You need to have your threading model down beforehand so you can actually get your code right. The reason for that is that there are a lot of different ways to make your...
read more
1.Defining the threading model for your application is probably the most important step you can take into making your code thread safe.You need to have your threading model down beforehand so you can actually get your code right. The reason for that is that there are a lot of different ways to make your class thread safe, and you can only pick the right one if you know the thread access pattern to your class. 2.This method compares 'this' string to the specified object. The result is true if and only if the argument is not null and is a String object that represents the same sequence of characters as this object. 3.------------------------------------------------------------------------------- String StringBuffer ---------------------------------------------------------------------------------- Storage Area Constant String Pool Heap Modifiable No (immutable) Yes( mutable ) Thread Safe Yes Yes Performance Fast Very slow ----------------------------------------------------------------------------------- read less
Comments
Dislike Bookmark

Core Java Advanced Java NET GATE Computer Science

equals method is in Object class whose default implementation checks the memory location of the objects which is similar to ===. The String class has overridden the equals method and new implementation checks the string content present in the object. One has to override the hashcode(in Object class)...
read more
equals method is in Object class whose default implementation checks the memory location of the objects which is similar to ===. The String class has overridden the equals method and new implementation checks the string content present in the object. One has to override the hashcode(in Object class) method too when override the equals method. read less
Comments
Dislike Bookmark

Experienced IT Trainer/Coach, Founder Win Corporate Training, Counsellor

String class is used create the immutable strings in Java. For Example: String str=new String("Good"); - If I want to add the word "Morning" I have to recreate my String class Object. String str=new String("Good Monring"); StringBuffer is used to create the Mutable Strings in Java StringBuffer...
read more
String class is used create the immutable strings in Java. For Example: String str=new String("Good"); - If I want to add the word "Morning" I have to recreate my String class Object. String str=new String("Good Monring"); StringBuffer is used to create the Mutable Strings in Java StringBuffer str1=new StringBuffer("Good"); str1.append("Monring"); We can add the new word without creating the object of the String class. read less
Comments
Dislike Bookmark

Software Engineer

1. What makes a class as "Thread safe class"? Thread safe class: If your class is being accessed by multiple threads then there is a possibility that class variable/properties may be accessed or changed by two or more thread simultaneously which may result in inconsistent behaviour of class. The process...
read more
1. What makes a class as "Thread safe class"? Thread safe class: If your class is being accessed by multiple threads then there is a possibility that class variable/properties may be accessed or changed by two or more thread simultaneously which may result in inconsistent behaviour of class. The process of preventing this is called as Thread safe. Process to make class thread safe: Use Synchronized Methods/blocks to prevent access of class properties by multiple threads. Use of Volatile keyword so that properties changed by one thread will immediately reflect to all other places. 2. equals() method uses equals method is used in Java to equate different Objects of Class. 3. Difference between String vs StringBuffer? String is immutable while StringBuffer is mutable. Mutable means state of object can be changed, while state of immutable can not be altered. read less
Comments
Dislike Bookmark

StringBuffer outdated , use StringBuilder thread safe,
Comments
Dislike Bookmark

View 24 more Answers

Related Questions

What is difference between Multithreading and miltiprocessing?
It is simple to understand. You question itself contains the answer. Only the keynote is: A single processor/core of the cpu can execute single task at a time, not more than one task. And you should...
Milan

i am working in mainframe technology, we are doing modernization, need to convert 1 cobol program to java program, is any one there to help me out, need same mainframe program with same login need to convert to java results should be same as mainframe, can some one help me out on this please
Yes, it can be converted. The thing I would need a plain text document which would describe what specific COBOL program is doing.
Varun
0 0
9
Is it possible to learn java at home without coaching in one month?
It all depends on you. If you are already aware of programming then it is definetly possible to learn java at home. But if learn through a tutor then you can learn easily.
Pritom
0 0
5
Who invented Java language?
James Gosling. You could have google it!!
Niranjan
Which is a good Java training and placement institute for a fresher in Bangalore?
I know an institute in HYderabad which is giving 100% job guarantee or 100% fee refund. They have office in bangalore also, not sure whether they are offering this program in Bangalore. Please visit their...
Raja
0 0
5

Now ask question in any of the 1000+ Categories, and get Answers from Tutors and Trainers on UrbanPro.com

Ask a Question

Related Lessons

JAVA - Object Cloning
JAVA - Object Cloning Is the way of creating the same copy of object without calling the class constructor. It means we can make any class object multiple times without calling its default constructor....

Gaurav Kothari

1 0
0
Method Overloading vs Method Overriding
1. Method Overloading: Method overloading means a same method with same name can have different implementations/body by changing one of the follwing thing: 1) Number of Parameters 2) Order of Parameters 3)...

Md Ajmat

0 0
0
Example of DependsOnMethod in TestNG
public class dependsonM { @Test public void login() { System.out.println("login"); } @Test (dependsOnMethods = {"login"}) public void email() { //Intentionally I am failing this testcase Assert.assertTrue(false);...
S

Sarthak C.

0 0
0
Java Overview
Java platform overview Java platform components The Java platform consists of the following components. The Java language Like any programming language, the Java language has its own structure, syntax...
A

Akshay Shende

0 0
0
Demand of java in industry
Java is one of the widest use language in the industry all around the world As in software market more than 80% software, platform developed using java. Java comes in three flavours:- j2se for window based...

Prashant Tomer

0 0
0

Recommended Articles

Java: An Object-Oriented Language

Java is the most commonly used popular programming language for the creation of web applications and platform today. Integrated Cloud Applications and Platform Services Oracle says, “Java developers worldwide has over 9 million and runs approximately 3 billion mobile phones”.  Right from its first implication as java 1.0...

Read full article >

Why Should You Learn Java !

Java is the most famous programming language till date. 20 years is a big time for any programming language to survive and gain strength. Java has been proved to be one of the most reliable programming languages for networked computers. source:techcentral.com Java was developed to pertain over the Internet. Over...

Read full article >

Top 5 Reasons to Learn JavaScript

Before we start on the importance of learning JavaScript, let’s start with a short introduction on the topic. JavaScript is the most popular programming language in the world, precisely it is the language - for Computers, the Web, Servers, Smart Phone, Laptops, Mobiles, Tablets and more. And if you are a beginner or planning...

Read full article >

Why Java is the Most Popular Programming Language

Designed in a flexible and user-friendly demeanor, Java is the most commonly used programming language for the creation of web applications and platform. It allows developers to “write once, run anywhere” (WORA). It is general-purpose, a high-level programming language developed by Sun Microsystem. Initially known as an...

Read full article >

Find Java Training Classes near you
Java Training Classes in Bangalore
Java Training Classes in Hyderabad
Java Training Classes in Pune
Java Training Classes in Chennai
Java Training Classes in Delhi
Java Training Classes in Mumbai
Java Training Classes in Kolkata
Java Training Classes in Noida
Java Training Classes in Gurgaon
Java Training Classes in Ahmedabad
Online Java Training

Looking for Java Training Classes?

Learn from the Best Tutors on UrbanPro

Are you a Tutor or Training Institute?

Join UrbanPro Today to find students near you
X

Looking for Java Training Classes?

The best tutors for Java Training Classes are on UrbanPro

  • Select the best Tutor
  • Book & Attend a Free Demo
  • Pay and start Learning

Learn Java Training with the Best Tutors

The best Tutors for Java Training Classes are on UrbanPro

This website uses cookies

We use cookies to improve user experience. Choose what cookies you allow us to use. You can read more about our Cookie Policy in our Privacy Policy

Accept All
Decline All

UrbanPro.com is India's largest network of most trusted tutors and institutes. Over 55 lakh students rely on UrbanPro.com, to fulfill their learning requirements across 1,000+ categories. Using UrbanPro.com, parents, and students can compare multiple Tutors and Institutes and choose the one that best suits their requirements. More than 7.5 lakh verified Tutors and Institutes are helping millions of students every day and growing their tutoring business on UrbanPro.com. Whether you are looking for a tutor to learn mathematics, a German language trainer to brush up your German language skills or an institute to upgrade your IT skills, we have got the best selection of Tutors and Training Institutes for you. Read more

ThinkVidya Learning Pvt Ltd © 2010-2024All Rights Reserved