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What is the difference between string, stringbuffer, stringbuilder?

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Java Trainer

String is immutable, means once you created a String you can not modify, Even if you try to it will create a new string for you and assign that to you. StringBuffer and StringBuilder are immutable, however methods of String buffer are thread safe, So when you are having multithreading in you application... read more
String is immutable, means once you created a String you can not modify, Even if you try to it will create a new string for you and assign that to you. StringBuffer and StringBuilder are immutable, however methods of String buffer are thread safe, So when you are having multithreading in you application you should use StringBuffer otherwise StringBuilder. read less
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Senior Software Engineer

String is immutable, if you try to alter their values, another object gets created, whereas StringBuffer and StringBuilder are mutable so they can change their values. Thread-Safety Difference: The difference between StringBuffer and StringBuilder is that StringBuffer is thread-safe. So when the... read more
String is immutable, if you try to alter their values, another object gets created, whereas StringBuffer and StringBuilder are mutable so they can change their values. Thread-Safety Difference: The difference between StringBuffer and StringBuilder is that StringBuffer is thread-safe. So when the application needs to be run only in a single thread then it is better to use StringBuilder. StringBuilder is more efficient than StringBuffer. Situations: If your string is not going to change use a String class because a String object is immutable. If your string can change (example: lots of logic and operations in the construction of the string) and will only be accessed from a single thread, using a StringBuilder is good enough. If your string can change, and will be accessed from multiple threads, use a StringBuffer because StringBuffer is synchronous so you have thread-safety. read less
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Trainer

String is immutable, i.e. once a String object is created and its value is assigned, its value can not be changed. This is because the String object is stored in Constant String Pool. If you assign a new value to a String reference variable, a new String object is created and stored in Constant String... read more
String is immutable, i.e. once a String object is created and its value is assigned, its value can not be changed. This is because the String object is stored in Constant String Pool. If you assign a new value to a String reference variable, a new String object is created and stored in Constant String Pool. Alternatively we can use String Buffer and String Builder which are mutable. It means their values can be changed after they have been created as they are stored in heap. The difference between StringBuffer and String Builder are given below: 1) StringBuffer is synchronised whereas StringBuilder is not synchronised 2) StringBuffer is thread safe whereas StringBuilder is not thread safe. 3) StringBuffer is slow in performance whereas StringBuilder is faster. read less
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12 years of MNC company work experience on java ,J2ee technologies

String is immutable and StringBuffer and StringBuilder are mutable. StringBuffer is synchronized i.e. thread safe. It means two threads can't call the methods of StringBuffer simultaneously. StringBuilder is non-synchronized i.e. not thread safe. It means two threads can call the methods of StringBuilder... read more
String is immutable and StringBuffer and StringBuilder are mutable. StringBuffer is synchronized i.e. thread safe. It means two threads can't call the methods of StringBuffer simultaneously. StringBuilder is non-synchronized i.e. not thread safe. It means two threads can call the methods of StringBuilder simultaneously. read less
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5+ years of Experience into Java Development and Training

String ---Immutable --not thread safe StringBuffers---Mutable ---thread safe StringBuilder---Mutable---Not thread safe. Each time you change a string objects value, new object will get created in the memory and reference starts referring the new object. But for StringBuffer and Buider the existing... read more
String ---Immutable --not thread safe StringBuffers---Mutable ---thread safe StringBuilder---Mutable---Not thread safe. Each time you change a string objects value, new object will get created in the memory and reference starts referring the new object. But for StringBuffer and Buider the existing object will get changed. No new memory gets allocated. read less
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Java Trainer with 6+ years of experience in big MNCs

String eats up the heap memory especially when there are modifications made and hence suggested not to be used in such scenarios.
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Java Web Application Development and Aptitude Trainer

String object are immutable, whereas StringBuffer and String Builder are mutable. Between StringBuffer and StringBuilder, the former is synchronized, hence providing thread safety, while the later is not synchronized, therefore should not be used in case of multithreading.
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Java Tutor

String is an immutable class , whereas StringBuffer is a synchronized mutable class so it is thread safe and StringBuilder is non-synchronized mutable class.
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Software Testing Trainer(Automation)

String does not has append,insert,capacity and replace methods but in StringBuffer and StringBuilder has,String is thread safe since its immutable,StringBuffer is also thread safe since all methods are synchronized but StringBuilder is not thread safe
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Trainer

String is immutable, if you try to alter their values, another object gets created, whereas StringBuffer and StringBuilder are mutable so they can change their values. Thread-Safety Difference: The difference between StringBuffer and StringBuilder is that StringBuffer is thread-safe.
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