第十四章中,SeetShop.java类
代码如下:
lass 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 SweetShop {
public static void main(String[] args) {
System.out.println("inside main");
new Candy();
System.out.println("After creating Candy");
try {
Class.forName("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");
}
}
我的运行结果是:
inside main
Loading Candy
After creating Candy
Couldn't find Gum
After Class.forName("Gum")
Loading Cookie
After creating Cookie
而书中的运行结果:
inside main
Loading Candy
After creating Candy
Loading Gum
After Class.forName("Gum")
Loading Cookie
在论坛中也找了下,大家的运行结果都与书中的一致,不知道为什么我会得到这个结果。我用的jdk是1.6的。接照原理,我觉得Gum应该是被load了的。
代码如下:
lass 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 SweetShop {
public static void main(String[] args) {
System.out.println("inside main");
new Candy();
System.out.println("After creating Candy");
try {
Class.forName("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");
}
}
我的运行结果是:
inside main
Loading Candy
After creating Candy
Couldn't find Gum
After Class.forName("Gum")
Loading Cookie
After creating Cookie
而书中的运行结果:
inside main
Loading Candy
After creating Candy
Loading Gum
After Class.forName("Gum")
Loading Cookie
在论坛中也找了下,大家的运行结果都与书中的一致,不知道为什么我会得到这个结果。我用的jdk是1.6的。接照原理,我觉得Gum应该是被load了的。
Class.forName(String st)方法中,st必须是全限定名,即包名.类名。
程序中,没有写明包名,所以类加载器无法定位该类。最后抛出ClassNotFoundException异常。