How to use Lambda expression to access external variables in Java?

1. You can access external final type variables in Lambda expressions.

// 转换器
@FunctionalInterface
interface Converter {
    T convert(F from);
}

2. Unlike anonymous inner classes, there is no need to explicitly declare the num variable as final type.

int num = 1;
Converter stringConverter =
        (from) -> String.valueOf(from + num);
 
stringConverter.convert(2);     // 3

What are the advantages of Java

1. Simple. As long as you understand the basic concepts, you can write applications suitable for various situations;

2. Object-oriented;

3. Distribution, Java is a network-oriented language;

4. Robustness, Java provides automatic garbage collection for memory management, preventing programs from Errors that are easy for operators to make when managing memory;

5. Security, Java used in network and distributed environments must prevent virus intrusion;

6. Architecture neutrality, as long as it is installed With the Java runtime system, it can run on any processor;

7. Portability, Java can be easily transplanted to different machines on the network;

8. Interpretation and execution, The Java interpreter directly interprets and executes Java bytecode.

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