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

New features in Java 12: How to use the new String API for string splicing

Introduction:
String splicing is a very common operation in daily Java development. The traditional approach is to use " "operator or String.concat() method to achieve. However, with the release of Java 12, the new String API was introduced, providing a more efficient and convenient way to perform string concatenation. This article will introduce the new features in Java 12 and demonstrate through code examples how to use the new String API for string concatenation.

1. Introduction to the new String API
A new String API was introduced in Java 12, which contains a series of new methods for string concatenation. The goal of these methods is to provide a more efficient and concise way to perform string concatenation.

The most important of these is the String.join() method, which allows us to join multiple strings using specified delimiters. Its usage is as follows:

String joinString = String.join(delimiter, str1, str2, ..., strN);

Among them, delimiter is the delimiter, str1, str2,..., strN are the strings that need to be connected.

In addition, Java 12 also introduces some auxiliary methods, such as String.format() and String.repeat(), which further simplify string processing and improve efficiency.

2. Use the new String API for string splicing
Below we use some specific code examples to demonstrate how to use the new String API for string splicing.

1. Use String.join() method for simple string splicing

   String str1 = "Hello";
   String str2 = "World";
   String joinString = String.join(" ", str1, str2);
   System.out.println(joinString);

   The output result is:
   Hello World

2. Use String.join() method to splice multiple strings

   String str1 = "Java";
   String str2 = "is";
   String str3 = "awesome";
   String joinString = String.join("-", str1, str2, str3);
   System.out.println(joinString);

   The output result is:
   Java-is-awesome

3. Use String.join () method to splice the elements in the collection

   List<String> stringList = Arrays.asList("Apple", "Banana", "Orange");
   String joinString = String.join(", ", stringList);
   System.out.println(joinString);

   The output result is:
   Apple, Banana, Orange

4. Use the String.format() method for string formatting Change

   String firstName = "John";
   String lastName = "Doe";
   String formattedString = String.format("Name: %s %s", firstName, lastName);
   System.out.println(formattedString);

   The output result is:
   Name: John Doe

5. Use the String.repeat() method to repeat the string

   String repeatedString = "Java".repeat(3);
   System.out.println(repeatedString);

   The output result For:
   JavaJavaJava

   Summary:
   The new features in Java 12 provide a more efficient and convenient way for string concatenation. With the new String API, we no longer need to use the " " operator or the String.concat() method for string concatenation, but can use the simpler String.join() method. In addition, there are methods such as String.format() and String.repeat() to further simplify string processing. Using these new features can improve code development efficiency and reduce the amount of redundant code. If you are using Java 12 or newer versions, you may wish to try using these new APIs for string concatenation. I believe it will bring better development experience and results.

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