The advancerscore framework in the Java class library
The advancerscore framework in the Java class library
Overview:
UNDERSCORE is a powerful and flexible Java functional programming library that provides many powerful tools and functions to simplify the operation of collecting, array and objects during the simplified Java development process.This article will introduce the UNDERSCORE framework of advanced application skills in the Java class library, and provide some Java code examples.
1. Simplify the collection operation:
UNDERSCORE can make the set operation more concise and efficient by providing a wealth of collection operation functions.For example, we can use Underscore's `Map` function to operate each element in the set and return a new set.
import com.github.underscore.Mapper;
public class Main {
public static void main(String[] args) {
Mapper<String, Integer> mapper = new Mapper<String, Integer>() {
public Integer map(String item) {
return Integer.parseInt(item);
}
};
List<String> numbers = Arrays.asList("1", "2", "3", "4", "5");
List<Integer> parsedNumbers = _.map(numbers, mapper);
System.out.println (PARSEDNUMBERS); // Output [1, 2, 3, 4, 5]
}
}
2. Simplify object operation:
UNDERSCORE provides many functions of simplified object operations, such as `extend`,` pick`, `defaults`, etc.These functions can help us operate and handle objects more conveniently.
import com.github.underscore.Obj;
public class Main {
public static void main(String[] args) {
Map<String, String> object1 = new HashMap<>();
object1.put("name", "John");
object1.put("age", "25");
Map<String, String> object2 = Obj.extend(object1, new HashMap<String, String>() {{
put("city", "New York");
put("occupation", "Engineer");
}});
System.out.println(object2); // 输出 {name=John, age=25, city=New York, occupation=Engineer}
}
}
3. Simplify array operation:
UNDERSCORE provides many convenient array operation functions, such as `First`, Last`,` without`, etc.These functions make the array more simple and efficient.
import com.github.underscore.ArrayU;
public class Main {
public static void main(String[] args) {
Integer[] numbers = {1, 2, 3, 4, 5};
Integer firstNumber = ArrayU.first(numbers);
System.out.println (firstNumber); // Output 1
Integer lastNumber = ArrayU.last(numbers);
System.out.println (LastNumber); // Output 5
List<Integer> withoutLastNumbers = ArrayU.without(numbers, 5);
System.out.println (withoutlastnumbers); // Output [1, 2, 3, 4]
}
}
Summarize:
The UNDERSCORE framework provides many powerful tools and functions for Java developers, which can greatly simplify the operation of collecting, array and objects.This article introduces the advanced application skills of the UNDERSCORE framework and gives some Java code examples.By learning these techniques, developers can handle and operate data more efficiently during the development of Java.
