关于Class.forName()出现ClassNotFoundException错误！
package c11;
interface HasBatteries {
}
interface Waterproof {
}
interface ShootsThings {
}
class Toy {
// Comment out the following default
// constructor to see
// NoSuchMethodError from (*1*)
Toy() {
}
Toy(int i) {
}
}
class FancyToy extends Toy implements HasBatteries, Waterproof, ShootsThings {
FancyToy() {
super(1);
}
}
public class ToyTest {
public static void main(String[] args) {
Class c = null;
try {
c = Class.forName("FancyToy");
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
printInfo(c);
Class[] faces = c.getInterfaces();
for (int i = 0; i < faces.length; i++)
printInfo(faces[i]);
Class cy = c.getSuperclass();
Object o = null;
try {
// Requires default constructor:
o = cy.newInstance(); // (*1*)
} catch (InstantiationException e) {
} catch (IllegalAccessException e) {
}
printInfo(o.getClass());
}
static void printInfo(Class cc) {
System.out.println("Class name: " + cc.getName() + " is interface? ["
+ cc.isInterface() + "]");
}
} // /:~
java.lang.ClassNotFoundException: FancyToy
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 c11.ToyTest.main(ToyTest.java:33)
经过我查看手册，发现一下描述：
参数：
className- 所需类的完全限定名。返回：
具有指定名的类的
Class对象。抛出：
LinkageError- 如果链接失败ExceptionInInitializerError- 如果此方法所激发的初始化失败ClassNotFoundException- 如果无法定位该类
好吧，手册上明明白白，清清楚楚的写了需要完全限定名。所以必须为forName方法的变量使用完全限定名的类名。