How to use java split() method

java split() method is used to split a string into multiple substrings. This method accepts a regular expression as a parameter and returns a string array. Common usage: 1. Use spaces to separate characters. string, a string array containing two elements will be returned; 2. Use commas to separate the string, which will return a string array containing three elements; 3. Use multiple characters as delimiters, and a string array containing three elements will be returned. A string array of elements; 4. Use the limit parameter to limit the number of divisions, and a string array containing two elements will be returned.

The operating environment of this article: Windows 10 system, Java 19.0.1 version, Dell G3 computer.

The split() method in Java is a method used to split a string into multiple substrings. This method accepts a regular expression as a parameter and returns a string array. The elements in the array are the substrings of the original string after being split.

The syntax of the split() method is as follows:

public String[] split(String regex)

Among them, regex is a regular expression used to specify the rules for splitting strings.

Here are some common usage examples:

Split a string using spaces:

String str = "Hello World";
String[] words = str.split(" ");

This will return a string containing two elements Array, the first element is "Hello", the second element is "World".

Use commas to split the string:

String str = "apple,banana,orange";
String[] fruits = str.split(",");

This will return a string array containing three elements, namely "apple", "banana" and "orange" ".

Use multiple characters as delimiters:

String str = "apple;banana;orange";
String[] fruits = str.split("[;,]");

This will return a string array with three elements, namely "apple", "banana" and "orange". Use square brackets [] in regular expressions to specify multiple characters as delimiters.

Use the limit parameter to limit the number of splits:

String str = "apple,banana,orange";
String[] fruits = str.split(",", 2);

This will return a string array containing two elements, "apple" and "banana,orange" . In this example, the limit parameter is 2, which means it can be split into at most two substrings.

It should be noted that the parameter of the split() method is a regular expression, so you need to pay attention to escaping special characters when using it. For example, if you want to use a period as a delimiter, you need to use "\." as a regular expression.

In addition, if consecutive delimiters appear in the original string, the split() method will return an empty string as the substring between the delimiters. For example:

String str = "apple,,banana,orange";
String[] fruits = str.split(",");

This will return a string array containing four elements, namely "apple", "", "banana" and "orange". The second element is an empty string because there are no other characters between consecutive commas.

Summary

The split() method is a very practical string processing method that can split a string into multiple substrings based on a specified regular expression. Splitting and extracting strings can be easily handled using the split() method.

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