·
package chapter7;
import java.io.IOException;
import java.io.InputStream;
/**
* description P280 代碼清單 7-8
*
* @author Leet
* @date 2020-12-02 20:51
**/
public class ClassLoaderTest {
public static void main(String[] args) throws ClassNotFoundException, IllegalAccessException, InstantiationException {
ClassLoader myLoader = new ClassLoader() {
@Override
public Class<?> loadClass(String name) throws ClassNotFoundException {
System.out.println("MINE");
String fileName = name.substring(name.lastIndexOf(".") + 1) + ".calss";
InputStream is = getClass().getResourceAsStream(fileName);
if (is == null) {
return super.loadClass(name);
}
try {
byte[] b = new byte[is.available()];
is.read(b);
return defineClass(name, b, 0, b.length);
} catch (IOException e) {
throw new ClassNotFoundException(name);
}
}
};
Object obj = myLoader.loadClass("chapter7.ClassLoaderTest").newInstance();
System.out.println(obj.getClass());
System.out.println(obj instanceof chapter7.ClassLoaderTest);
}
}
《深入理解Java虛擬機》第三版 P 281 代碼清單 7-8 除了包名不一致，其他全部一致
書上說，最后一行輸出：false
但我實操輸出的是：true
請問為什么呢？
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標籤：Java相關