Using Guava for tool class processing in Java API development

Java is a powerful and widely used programming language, and the development of Java API is also a very important part of many enterprises. In the development of Java API, tool classes are often needed, and Guava is a very excellent Java tool class library. It provides many high-quality tool classes and methods, which greatly simplifies some common operations in Java programming.

Guava is a Java tool library developed by Google. It contains some efficient, lightweight, and easy-to-use tool classes and methods, such as collections, caching, string processing, and concurrency tools. As an excellent tool library, the use of Guava in Java API development can greatly improve the simplicity, readability and maintainability of the code.

When using Guava for tool class processing, there are several commonly used class libraries and methods that need to be mastered.

1. Collection processing

Guava provides many efficient collection processing methods, such as creating immutable collections, filtering collections, converting collections, etc. Among them, immutable collections are a special collection type provided by Guava. Once created, they cannot be modified. The advantages of this collection are thread safety and efficiency.

The method to create an immutable collection using Guava is very simple, as shown below:

List<String> immutableList = ImmutableList.of("a", "b", "c");
Set<String> immutableSet = ImmutableSet.of("a", "b", "c");

When using an immutable collection, you can create a mutable collection through the copyOf method A copy, as shown below:

List<String> mutableList = Lists.newArrayList(immutableList);
Set<String> mutableSet = Sets.newHashSet(immutableSet);

In addition to immutable collections, Guava also provides many collection processing methods, such as filtering collections, converting collections, etc., which can greatly improve the development efficiency of Java APIs.

2. Cache processing

In the development of Java API, we usually need to use caching to improve system performance. Guava provides a very excellent cache processing library that can implement caching quickly and efficiently.

The method of using Guava cache processing is very simple. You only need to use CacheBuilder to build the cache object and specify the cache capacity, expiration time, etc., for example:

Cache<String, Object> cache = CacheBuilder.newBuilder()
            .maximumSize(1000)
            .expireAfterWrite(10, TimeUnit.MINUTES)
            .build();

In actual use, just You need to add the cache through the put method, and get the cache through the get method.

cache.put("key", object);
Object value = cache.getIfPresent("key");

3. String processing

In the development of Java API, string processing is a very important link. Guava provides many excellent string processing methods, such as splitting strings, concatenating strings, limiting string length, etc.

Among them, Joiner and Splitter are two commonly used string manipulation tool classes in Guava. The former is used for string concatenation, and the latter is used for string splitting.

The method of connecting strings using Joiner is very simple, for example:

List<String> list = Lists.newArrayList("a", "b", "c");
String s = Joiner.on(",").join(list);

When using Splitter to split a string, you can specify the delimiter, Ignore whitespace characters, remove starting and ending delimiters, etc., for example:

String str = "a,b,c";
List<String> list = Splitter.on(",")
            .trimResults()
            .omitEmptyStrings()
            .splitToList(str);

The above are three class libraries and methods commonly used by Guava in Java API development. Of course, Guava also provides many other utility classes. and methods, such as date and time processing, concurrent processing, etc. You can choose the appropriate classes and methods to use according to actual needs.

In short, using Guava for tool class processing can greatly improve Java API development efficiency and code quality, making Java API development more concise, easy to read, and easy to maintain.

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