What's new in Java 12: How to format and parse strings using the new String API

As an object-oriented programming language, Java has introduced many new features in its continuous development. In the latest Java 12, there are also some exciting new features, one of which is the new String API for formatting and parsing strings. This article will introduce these new features in Java 12 and provide corresponding code examples to help readers better understand and apply them.

The new String API in Java 12 mainly includes two aspects of functionality: string formatting and string parsing.

First, let’s look at string formatting. In previous Java versions, we usually used the String.format() method to format strings, but its syntax was relatively cumbersome and error-prone. In Java 12, we can use the formatted() method in the new String API to format strings more concisely.

The following is a simple example that demonstrates how to use the formatted() method to format a string:

String name = "Tom";
int age = 25;

String formattedString = "My name is %s and I am %d years old".formatted(name, age);
System.out.println(formattedString);

In the above code, we use %s and %d to represent strings and placeholders of integer type, corresponding to the values ​​of name and age respectively. Using the formatted() method, we can replace the placeholder by passing the corresponding parameters to achieve the formatting effect of the string. The output is: "My name is Tom and I am 25 years old".

In addition to simplifying string formatting, the new String API in Java 12 also provides string parsing functions. In the past, we usually used regular expressions or other complex processing methods to parse strings, but in Java 12, we can parse strings more conveniently through new methods in the new String API.

The following is a simple example that demonstrates how to use the lines() method in the new String API to parse multiple lines of text:

String multilineText = "Hello
World
Java";

List<String> lines = multilineText.lines().collect(Collectors.toList());
for (String line : lines) {
    System.out.println(line);
}

In the above code, we use lines() The method splits the string into multiple strings by line and collects them into a List through the collect() method. We can then iterate through this List and output the text of each line. The output result is:

Hello
World
Java

Through the lines() method in the new String API, we can process multi-line text more conveniently without additional complex processing.

In summary, in Java 12, the new String API introduced provides a more concise and convenient method for string formatting and parsing. Through new features such as the formatted() method and lines() method, we can handle strings more easily, making the code more readable and easier to maintain.

Here is just a small introduction to the features of the new String API in Java 12. In fact, there are other useful methods that can help us better handle strings. For Java developers, understanding and applying these new features will help improve the efficiency and readability of the code, so it is worth learning and practicing in depth.

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