类加载器与类全名才能确立其在JVM中的唯一性
public class SimpleTest {
public static void main(String[] args) throws Exception {
/**
* 类加载器与instanceof关系的演示
*/
ClassLoader myLoader = new ClassLoader() {
@Override
public Class<?> loadClass(String name) throws ClassNotFoundException {
try {
String fileName = name.substring(name.lastIndexOf(".") + 1) + ".class";
InputStream is = getClass().getResourceAsStream(fileName);
if (is == null) {
return super.loadClass(name);
}
byte[] b = new byte[is.available()];
is.read(b);
return defineClass(name, b, 0, b.length);
}
catch (Exception e) {
throw new ClassNotFoundException(name);
}
}
};
Object obj = myLoader.loadClass("com.suntek.SimpleTest").newInstance();
System.out.println(obj.getClass());
System.out.println(obj instanceof com.suntek.SimpleTest);
}
}
