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This article mainly shows you "what are the methods of Java string splicing", the content is simple and easy to understand, and the organization is clear. I hope it can help you solve your doubts. Let Xiaobian lead you to study and learn "what are the methods of Java string splicing" this article.

> String concatenation generally use "+", but "+" can not meet the processing of large quantities of data, Java has the following five methods to deal with string concatenation, each has advantages and disadvantages, program development should choose the appropriate method to achieve.

1. Plus "+"

2. String contact() method

3. StringUtils.join() method

4. StringBuffer append() method

5. StringBuilder append() method

> After a simple program test, the time cost from 100 to 900,000 executions is as follows:

It follows from this that:

1. Method 1 plus "+" concatenation and method 2 String contact() method is suitable for small data operations, the code is simple and convenient, plus "+" is more in line with our coding and reading habits;

2. Method 3 StringUtils.join() method is suitable for converting ArrayList into a string, even if 900,000 pieces of data only takes 68ms, you can save the code to read ArrayList cyclically;

3. Method 4 StringBuffer append() method and method 5 StringBuilder append() method In fact, their essence is the same, they are inherited from AbstractStringBuilder, the highest efficiency, large-scale data processing is the best choice of these two methods.

4. Method 1 plus "+" concatenation and method 2 String contact() methods are expensive in time and space (analysis at the end of this article) and cannot be used for batch data processing.

> Source code, for reference package cnblogs.twzheng.lab2;/** * @author Tan Wenzheng * */import java.util.ArrayList;import java.util.List;import org.apache.commons.lang3.StringUtils;public class TestString { private static final int max = 100; public void testPlus() { System.out.println(">>> testPlus() testConcat() testJoin() >> testStringBuffer() testStringBuilder()

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