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

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

Introduction:
Java 12 is the latest version of the Java language, which brings many commands Excited features and improvements. One of the important new features is the enhancement to the string processing API. This article will introduce how to use the new String API in Java 12 to deduplicate and count strings, and provide corresponding code examples.

1. String deduplication
In actual development, we often need to deduplicate repeated strings. Before Java 12, we usually used Set collection to deduplicate strings. However, the new String API in Java 12 gives us a more concise and efficient approach.

In the new String API, we can use the String.lines() method to split the string into multiple lines and use the distinct() method to remove Duplicate rows. The following is a sample code:

String input = "apple
orange
banana
apple
pear
banana";
String output = input.lines().distinct().collect(Collectors.joining("
"));
System.out.println(output);

Run the above code, the output is as follows:

apple
orange
banana
pear

By using the new String API, we can more easily deduplicate strings.

2. String statistics
In addition to deduplication, we often need to perform statistical operations on strings. Before Java 12, we usually used Map collections to perform string counting operations. However, the new String API in Java 12 provides a simpler approach.

In the new String API, we can use the String.lines() method to split a string into multiple lines and Collectors.groupingBy() Method groups each line of string. We can then count each group using the Collectors.counting() method. The following is a sample code:

String input = "apple
orange
banana
apple
pear
banana";
Map<String, Long> result = input.lines()
                              .collect(Collectors.groupingBy(Function.identity(), Collectors.counting()));
System.out.println(result);

Run the above code, the output is as follows:

{banana=2, apple=2, pear=1, orange=1}

By using the new String API, we can perform statistical operations on strings more conveniently.

3. Summary
The new String API is a very useful feature in Java 12. By using the new String API, we can perform deduplication and statistical operations on strings more conveniently and efficiently, eliminating the previous cumbersome operation steps. This article introduces how to use the new String API to deduplicate and count strings, and provides corresponding code examples.

It is worth mentioning that although the sample code in this article uses the new features of Java 12, users of Java 11 and below can still use similar methods to achieve the same functionality.

I hope this article can help you better understand and use the new String API in Java 12 and enhance your Java programming skills. Happy programming!

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