A股上市公司传智教育(股票代码 003032)旗下技术交流社区北京昌平校区

 找回密码
 加入黑马

QQ登录

只需一步,快速开始

© che201311 中级黑马   /  2013-11-22 17:17  /  1157 人查看  /  1 人回复  /   0 人收藏 转载请遵从CC协议 禁止商业使用本文

Java code
?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
class Initable {
  static final int staticFinal = 47;
  static final int staticFinal2 =ClassInitialization.rand.nextInt(1000);
  static {
    System.out.println("Initializing Initable");
  }
}
class Initable2 {
  static int staticNonFinal = 147;
  static {
    System.out.println("Initializing Initable2");
  }
}

class Initable3 {
  static int staticNonFinal = 74;
  static {
    System.out.println("Initializing Initable3");
  }
}

public class ClassInitialization {
  public static Random rand = new Random(47);
  public static void main(String[] args) throws Exception {
    Class initable = Initable.class;
    System.out.println("After creating Initable ref");
    // Does not trigger initialization:
    System.out.println(Initable.staticFinal);
    // Does trigger initialization:
    System.out.println(Initable.staticFinal2);
    // Does trigger initialization:
    System.out.println(Initable2.staticNonFinal);
    Class initable3 = Class.forName("Initable3");
    System.out.println("After creating Initable3 ref");
    System.out.println(Initable3.staticNonFinal);
  }
}


运行结果报错:After creating Initable ref
47
Initializing Initable
258
Initializing Initable2
147
Exception in thread "main" java.lang.ClassNotFoundException: Initable3
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at aaaa.ClassInitialization.main(ClassInitialization.java:38)
为什么?为什么?

1 个回复

倒序浏览
Class initable3 = Class.forName("Initable3");  
这一句传入的字符串必须是完整的路径名,包名.类名
回复 使用道具 举报
您需要登录后才可以回帖 登录 | 加入黑马