Difference between String, StringBuffer and StringBuilder, stringbuffer

Difference between String, StringBuffer and StringBuilder, stringbuffer

Differences between String, StringBuffer, and StringBuilder

1. The String class is an unchangeable class, that is, once a String object is created, the Character Sequence containing this object cannot be changed.

2. In the process of String concatenation, the String efficiency is lower than that of StringBuffer and StringBuilder.

3. StringBuilder has better performance than StringBuffer

4. StringBuffer is thread-safe and StringBuilder is thread-unsafe.

What is the difference between stringbuffer and stringbuilder?

1. Comparison of execution speed: StringBuilder> StringBuffer
2. stringBuffer and StringBuilder are string variables and changeable objects. Each time we use them to operate on strings, they are actually operated on an object, unlike creating some objects like strings for operations, the speed is faster.
3. StringBuilder: thread-safe
StringBuffer: thread-safe
When we use it in string buffering by multiple threads, the JVM cannot ensure that the StringBuilder operation is safe. Although its speed is the fastest, it can ensure that StringBuffer can be operated correctly. Of course, in most cases, we perform operations in a single thread. In most cases, we recommend using StringBuilder instead of StringBuffer, which is the reason for speed.

Summary: 1. If you want to operate a small amount of data, use = String
2. A single thread operates on a large amount of data in the string buffer = StringBuilder
3. multi-threaded operations on a large amount of data in the string buffer = StringBuffer

C # What is the difference between String and StringBuffer? What is the difference between StringBuffer and StringBuilder?

String is fixed, which means that it consumes resources to connect strings in the String.

StringBuffer can be used as a buffer, so it is generally used as a string buffer.

The only difference between StringBuilder and StringBuffer is that the Builder thread is not secure and thus faster.