What's new in Java 12: How to use the new String API for string splitting and concatenation

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

Java 12 brings many exciting new features, one of the important improvements is the String API upgrade. In this article, we will focus on how to use the new String API in Java 12 for string splitting and concatenation.

In the past, two common operations for processing strings in Java were splitting strings and concatenating strings. In older versions of Java, we usually use the split() method to split strings, and the " " operator or concat() method to concatenate strings. However, these methods may cause performance issues or verbose code in certain situations.

In Java 12, some new String API methods are introduced to solve these problems and provide a more efficient and concise way to perform string splitting and splicing operations.

First, let's take a look at how to use the new String API methods for string splitting. In Java 12, we can use the splitAsStream() method to split a string according to the specified delimiter and return the result as a stream type.

Code example:

String str = "Java-12-is-awesome";
Pattern pattern = Pattern.compile("-");
Stream<String> stream = pattern.splitAsStream(str);
stream.forEach(System.out::println);

In this example, we first use the Pattern.compile() method to create a regular expression pattern object that can match "-" in the string character. Then, we call the splitAsStream() method to split the given string according to the pattern and return a stream type result. Finally, we iterate through each segment in the stream through the forEach() method and print it out.

By using the splitAsStream() method, we can split the string more conveniently and the code is more concise. In addition, this method can also enjoy the benefits of flow programming, such as using filter(), map() and other methods to further process the divided parts.

Next, let’s learn how to use the new String API method for string concatenation. In Java 12, we can use StringJoiner class to join multiple strings.

Code example:

StringJoiner joiner = new StringJoiner(",");
joiner.add("Java");
joiner.add("12");
joiner.add("is");
joiner.add("awesome");
String result = joiner.toString();
System.out.println(result);

In this example, we first create a StringJoiner object and specify the separator between strings as ",". Then, we use the add() method to add multiple strings to the StringJoiner object one by one. Finally, we get the final splicing result by calling the toString() method and print it out.

Using the StringJoiner class, we can perform string splicing operations more conveniently and avoid performance problems caused by frequent use of the " " operator or concat() method.

To sum up, the new String API in Java 12 provides a more efficient and concise way to perform string splitting and splicing operations. By using the splitAsStream() method for string splitting, we can separate strings more conveniently and enjoy the benefits of stream programming. Using the StringJoiner class for string splicing can splice multiple strings more quickly and avoid performance problems.

If you are still using an old version of Java, you may wish to consider upgrading to Java 12 and try to use the new String API for string operations. This will make your code more efficient and concise, improving development efficiency.

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