Scala入门示例反编译分析代码执行流程

末蓝、 2023-10-05 14:53 37阅读 0赞

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javap一下，看反编译结果：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2E3NzIzMDQ0MTk_size_16_color_FFFFFF_t_70 1]  
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package com.zxl.java.chapter01;
    
    //分析
    // 1. object在底层会生成两个类Hello , Hello$
    // 2. Hello中有个main函数，调用Hello$类的一个静态对象MODULES$
    // 3. Hello$.MODULE$.对象是静态的，通过该对象调用Hello$的 main函数
    // 4. 可以理解我们在main中写的代码在放在Hello$的main,在底层执行时scala编译器做了一个包装
    public class HelloWorld {
        
        public static void main(String[] args) {
        
            Hello2$.MODULE$.main(args);
        }
    }
    
    final class Hello2$ {
        
        public static final Hello2$ MODULE$;
        static {
        
            MODULE$ = new Hello2$();
        }
        public void main(String[] args) {
        
            System.out.println("hello world");
        }
     }

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