Class.forname()

package example;

class Candy{
    static {System.out.println("loading Candy");}
}
class Gum{
    static {System.out.println("loading Gum");}
}
class Cookie{
    static {System.out.println("loading Cookie");}
}
public class Test  {
    public static void main(String[] args){
        System.out.println("inside main");
        new Candy();
        System.out.println("After Creating Candy");
        try {
            Class.forName("example.Gum");
        } catch (ClassNotFoundException e) {
            System.out.println("Couldn't find Gum" );
        }
        System.out.println("After Class.forname("Gum")");
        new Cookie();
        System.out.println("After Creating Cookie");
    }
    
}

输出：

inside main
loading Candy
After Creating Candy
loading Gum
After Class.forname("Gum")
loading Cookie
After Creating Cookie

static初始化是在类加载时进行的

Class.forname()方法是class类一个static成员，是取得Class对象的引用的一种方法。

如果类Gum还没被加载就加载他，在加载过程中，static字句执行