What is the difference between string, stringbuffer, stringbuilder?

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Ranadheer Reddy

Computer Classes

String is immutable, whereas StringBuffer and StringBuilder are mutable
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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...
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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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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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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. The difference between StringBuffer and StringBuilder is that StringBuffer is thread-safe where as StringBuilder is not thread-safe.
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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...
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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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Geek Trainer

String is an immutable object which means the value cannot be changed once created where as StringBuffer is mutable. The StringBuffer is Synchronized hence thread safe where as StringBuilder is mutable but not synchornized and suitable for only single threaded instances.
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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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String is immutable, once you create a String object you can not modify that object. StringBuffer and StringBuilder are mutable, after creating the object you can modify that. The difference between StringBuffer and StrinngBuilder is, The methods in StringBuilder are synchronized methods and StringBuffer...
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String is immutable, once you create a String object you can not modify that object. StringBuffer and StringBuilder are mutable, after creating the object you can modify that. The difference between StringBuffer and StrinngBuilder is, The methods in StringBuilder are synchronized methods and StringBuffer methods are not synchronized . So, if you are concerned about thread safety go for StringBuilder otherwise go for StringBuffer. read less
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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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Web technologies Trainer

String objects cannot be changed once they are created. Ex: String s1 = "abc"; s1 = s1+"def"; Now the reference s1 refers to the string "abcdef". But the string "abc" which is created earlier is not modified. It still exists in a string pool. Instead a new string is created which is "abcdef" and its...
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String objects cannot be changed once they are created. Ex: String s1 = "abc"; s1 = s1+"def"; Now the reference s1 refers to the string "abcdef". But the string "abc" which is created earlier is not modified. It still exists in a string pool. Instead a new string is created which is "abcdef" and its referred by s1. Now if s1 was StringBuffer or a StringBuilder, Ex: StringBuffer sb = new StringBuffer("abc"); sb= sb.append("def"); "abc" gets modified to "abcdef". Therefore its only one object which is created and that itself gets modified. The StringBuffer is thread safe and hence the operations are slow compared to StringBuilder. Hope this helps. read less
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