类加载（一）：static块 和 Class.forName

1. 

class Some {
    static{
        System.out.println("1");
    }
    
    public Some(){
        System.out.println("2");
    }
}

class Some2 extends Some{
    static{
        System.out.println("a");
    }
    
    public Some2(){
        System.out.println("b");
    }
}

2.

    public static void main(String[] args) throws Exception {
        
//        new Some2();   //1a2b
        
//        new Some(); new Some2();  12a2b
        
//        Class.forName("com.gl.typeof.Some2");  //1a
        
//        Class.forName("com.gl.typeof.Some2"); new Some2(); // 1a2b   
//        Class.forName("com.gl.typeof.Some2").newInstance(); //1a2b 
    }