Which of this method of class StringBuffer is used to concatenate the String data?
String is one of the most widely used classes in Java. StringBuffer and StringBuilder classes provide methods to manipulate strings. We will look into the difference between StringBuffer and StringBuilder. StringBuffer vs StringBuilder is a popular Java interview question. Show
String vs StringBuffer vs StringBuilderThe string is one of the most important topics in the core java interview. If you are writing a program that prints something on the console, you are use String. This tutorial is aimed to focus on major features of String class. Then we will compare the StringBuffer and StringBuilder classes. String in Java
String vs StringBufferSince String is immutable in Java, whenever we do String manipulation like concatenation, substring, etc. it generates a new String and discards the older String for garbage collection. These are heavy operations and generate a lot of garbage in heap. So Java has provided StringBuffer and StringBuilder classes that should be used for String manipulation. StringBuffer and StringBuilder are mutable objects in Java. They provide append(), insert(), delete(), and substring() methods for String manipulation. StringBuffer vs StringBuilderStringBuffer was the only choice for String manipulation until Java 1.4. But, it has one disadvantage that all of its public methods are synchronized. StringBuffer provides Thread safety but at a performance cost. In most of the scenarios, we don’t use String in a multithreaded environment. So Java 1.5 introduced a new class StringBuilder, which is similar to StringBuffer except for thread-safety and synchronization. StringBuffer has some extra methods such as substring, length, capacity, trimToSize, etc. However, these are not required since you have all these present in String too. That’s why these methods were never implemented in the StringBuilder class. StringBuffer was introduced in Java 1.0 whereas StringBuilder class was introduced in Java 1.5 after looking at shortcomings of StringBuffer. If you are in a single-threaded environment or don’t care about thread safety, you should use StringBuilder. Otherwise, use StringBuffer for thread-safe operations. StringBuilder vs StringBuffer PerformanceI am trying to check the effect on performance because of synchronization with a sample program that
performs
I ran the same code for the StringBuffer object also to check the time and memory values. I have executed the code 5 times for each case and then calculated the average values.
It’s clear that StringBuilder performs better than StringBuffer even in the case of a single-threaded environment. This difference in performance can be caused by synchronization in StringBuffer methods. String vs StringBuffer vs StringBuilder
That’s all for a quick roundup of difference between String, StringBuffer, and StringBuilder. StringBuilder is better suited than StringBuffer in most of the general programming scenarios. References:
Which method is to concat strings in StringBuffer?To improve performance, instead of using string concatenation, use StringBuffer. append().
Which of this method of class StringBuffer is used to?Important methods of StringBuffer class
It is used to append the specified string with this string. The append() method is overloaded like append(char), append(boolean), append(int), append(float), append(double) etc. It is used to insert the specified string with this string at the specified position.
Which of the following methods of the StringBuffer class is used to find the length of a string?Explanation: length() method is used to obtain length of StringBuffer object, length of “Hello” is 5.
What is a StringBuffer method?A string buffer is like a String , but can be modified. At any point in time it contains some particular sequence of characters, but the length and content of the sequence can be changed through certain method calls. String buffers are safe for use by multiple threads.
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