How does Java use the split() function of the String class to split a string and specify the number of split substrings?

How does Java use the split() function of the String class to split a string and specify the number of split substrings

In Java, the String class provides the split() function to split a string. . This function can split a string into multiple substrings according to the specified delimiter, and store these substrings in an array and return it. But sometimes we don't want to split all substrings, but just want to specify the number of splits. This article will introduce how to use the split() function to split a string and specify the number of substrings to be split.

First, let’s take a look at the basic usage of the split() function. The split() function accepts a regular expression as a parameter to specify the delimiter of the string. The following is a simple example:

String str = "Hello,World,Java";
String[] tokens = str.split(",");
for (String token : tokens) {
    System.out.println(token);
}

Run the above code, the output result is:

Hello
World
Java

In the above code, we use commas as the separator to split the string "Hello, World, Java" Divide it into three substrings, and then print these substrings separately. This is the most basic usage of the split() function.

Next, let’s take a look at how to specify the number of substrings to split. The split() function of the String class has an overloaded version that accepts an integer parameter to specify the number of substrings to be split. The following is an example:

String str = "Hello,World,Java";
String[] tokens = str.split(",", 2);
for (String token : tokens) {
    System.out.println(token);
}

Run the above code, the output result is:

Hello
World,Java

In the above code, we specify the split subdivision by passing parameter 2 to the split() function The number of strings is 2. The result is "Hello" before the first comma as the first substring, and the remaining "World,Java" as the second substring. Then we print these two substrings separately.

It should be noted that if the specified number of split substrings is greater than the actual number of delimiters, all remaining parts will be returned as the last substring. The following is an example:

String str = "Hello,World,Java";
String[] tokens = str.split(",", 4);
for (String token : tokens) {
    System.out.println(token);
}

Run the above code, the output result is:

Hello
World
Java

In the above code, we specify the number of substrings to be split as 4, but in fact there are only 3 separator. The result is "Hello" and "World" before the first two commas as the first two substrings, and the remaining "Java" as the last substring.

To summarize, by using the split() function of the String class, we can easily split a string into multiple substrings according to the specified delimiter. If we only want to split a specified number of substrings, we can use the overloaded version of the split() function and pass an integer parameter to specify the number of substrings to split. I hope this article will help you understand the use of split() function.

The above is an introduction to how Java uses the split() function of the String class to split a string and specify the number of split substrings. Through code examples, we can clearly understand this process. In actual development, mastering the use of the split() function will help handle string splitting operations and improve program efficiency.

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