Difference Between String And Stringbuffer Class In Java
difference between String and StringBuffer class in Java: A Comparison
Difference Between String And Stringbuffer Class In Java
In Java, the String class represents an immutable sequence of characters, meaning that once a string object is created, its value cannot be changed. On the other hand, the StringBuffer class represents a mutable sequence of characters, allowing for dynamic modifications to the string content. This means that when you perform operations like concatenation or appending on a String object, a new object is created each time, whereas with StringBuffer, the contents can be modified directly without creating new objects. Therefore, if you need to perform a lot of modifications on a string, it is more efficient to use StringBuffer or its thread-safe counterpart, StringBuilder, to avoid unnecessary object creations and improve performance.
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1 - String class in Java is immutable, which means once a String object is created, it cannot be changed. On the other hand, StringBuffer class is mutable, allowing for modifications to the contents of the object.
2) When a new String object is created or manipulated, a new object is created in memory each time, leading to increased memory usage. StringBuffer, however, allows for in place modifications, reducing memory overhead.
3) String class in Java is thread safe, meaning it is safe to be used in a multi threaded environment without additional synchronization. StringBuffer is also thread safe by providing synchronized methods for safe execution in concurrent environments.
4) String class offers various utility methods for string manipulation but does not provide methods for modifying its content. StringBuffer, on the other hand, provides methods such as append(), insert(), delete(), and replace() to modify its content.
5) Performance wise, String is faster when used in a single threaded environment due to its immutability. StringBuffer is suitable for scenarios where frequent modifications are required or when thread safety is a concern.
6) The String class is part of the java.lang package, while StringBuffer is present in java.lang package as well but is located in the java.lang package.
7) In terms of memory usage, since Strings are immutable and every modification creates a new instance in memory, they can lead to memory wastage in situations where many modifications are performed. StringBuffer avoids this issue by allowing direct modifications to its content.
8) If you need to concatenate or modify strings multiple times, it is generally more efficient to use StringBuffer rather than repeatedly creating new String objects.
9) In general, choosing between String and StringBuffer depends on the specific requirements of the application. Immutable Strings are preferable for scenarios where immutability is beneficial, while StringBuffer is more suitable for scenarios involving frequent string modifications.
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