New features in Java 12: How to use the new String API for string slicing and substitution

New features in Java 12: How to use the new String API to cut and replace strings

In Java programming, string manipulation is a very common task. Whether it is cutting a string or replacing some content in a string, it is an essential operation in the development process. In Java 12, some new String APIs are introduced to make string cutting and replacement more convenient. This article introduces these new features and illustrates them with code examples.

First, let us take a look at the new API for string cutting in Java 12. In previous versions, we usually used the split() method of String to implement string cutting operations. However, this method has some limitations, such as the need to use regular expressions to specify cutting rules, and the returned result is an array. In Java 12, a new method splitAsStream() is added, which returns a Stream object, which can be convenient for subsequent processing.

The following is a sample code that demonstrates how to use the splitAsStream() method to cut strings:

String str = "Hello,World,Java,12";
List<String> strList = Arrays.stream(str.split(","))
                            .collect(Collectors.toList());
System.out.println(strList);

Run the above code and it will output: [Hello, World, Java, 12]. As you can see, the splitAsStream() method cuts the string according to commas and collects the cut results into a List.

In addition to cutting strings, Java 12 also introduces a new API for replacing strings. In previous versions, we usually used the replaceAll() method to replace certain content in a string. However, there are some problems with this approach, such as the need to use regular expressions to specify alternative rules. In Java 12, a new replace(CharSequence, CharSequence) method is added to make substitution operations easier.

The following is a sample code that demonstrates how to use the replace() method to replace a string:

String str = "Java 8 is great";
String newStr = str.replace("8", "12");
System.out.println(newStr);

Running the above code will output: Java 12 is great. As you can see, the replace() method replaces "8" in the string with "12".

Summary:
Some new String APIs are introduced in Java 12, making string cutting and replacement operations more convenient. The new splitAsStream() method returns a Stream object to facilitate subsequent processing; the new replace(CharSequence, CharSequence) method can directly replace certain contents in the string. Developers can improve the efficiency and flexibility of string operations by learning and mastering these new APIs.

Emphasis:
This is used in order to simplify the description of the code using String's split() method as much as possible (modify the reg rule to ",").

I hope this article can help everyone better understand the new features of string cutting and substitution in Java 12. In actual development, you can flexibly use these new APIs to improve coding efficiency and quality.

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