Java9 Class类 newInstance 过时

最新推荐文章于 2024-05-07 14:44:04 发布

jieluomu12

最新推荐文章于 2024-05-07 14:44:04 发布

阅读量928

点赞数

分类专栏： java

原文链接：https://blog.youkuaiyun.com/qq_39424178/article/details/98121862

版权

java 专栏收录该内容

66 篇文章

订阅专栏

本文介绍了Java9中Class类的newInstance方法的变化及其原因。该方法已过时，并被推荐使用getDeclaredConstructor().newInstance()替代，以避免直接传播构造函数抛出的异常。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

Java9 Class类 newInstance 过时

Class.forName("类的全限定名").newInstance();

1
被替换为

Class.forName("类的全限定名").getDeclaredConstructor().newInstance();

1
源码说明

    /**
     * Creates a new instance of the class represented by this {@code Class}
     * object.  The class is instantiated as if by a {@code new}
     * expression with an empty argument list.  The class is initialized if it
     * has not already been initialized.
     *
     * @deprecated This method propagates any exception thrown by the
     * nullary constructor, including a checked exception.  Use of
     * this method effectively bypasses the compile-time exception
     * checking that would otherwise be performed by the compiler.
     * The {@link
     * java.lang.reflect.Constructor#newInstance(java.lang.Object...)
     * Constructor.newInstance} method avoids this problem by wrapping
     * any exception thrown by the constructor in a (checked) {@link
     * java.lang.reflect.InvocationTargetException}.
     *
     * <p>The call
     *
     * <pre>{@code
     * clazz.newInstance()
     * }</pre>
     *
     * can be replaced by
     *
     * <pre>{@code
     * clazz.getDeclaredConstructor().newInstance()
     * }</pre>
     */

感谢优快云博主「吃口雪花」
————————————————
版权声明：本文为优快云博主「吃口雪花」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.youkuaiyun.com/qq_39424178/article/details/98121862