The + and append functions in Java

What is the difference between the + and append in Java that can append objects of a string type?

There is a specific description in the blog post http://blog.csdn.net/shirleyacount/article/details/39958371, I believe that after watching, you will understand.

The following is an API for the Append method

You can see that the value returned by the Append method is of type StringBuffer.

StringBuffer's brief description is as follows:

StringBuilder's brief description is as follows:

So it can be seen that the execution speed in general is: stringbuilder>stringbuffer>string

However, specific situations need to be discussed, so the use should be combined with specific circumstances.

The + and append functions in Java