The method newInstance() from the type Class is deprecated since version 9

newInstance()在 java9中已被弃用

JAVA9之前用法

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

JAVA9之后用法

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

源码说明

     /**
      * Uses the constructor represented by this {@code Constructor} object to
      * create and initialize a new instance of the constructor's
      * declaring class, with the specified initialization parameters.
      * Individual parameters are automatically unwrapped to match
      * primitive formal parameters, and both primitive and reference
      * parameters are subject to method invocation conversions as necessary.
      *
      * <p>If the number of formal parameters required by the underlying constructor
      * is 0, the supplied {@code initargs} array may be of length 0 or null.
      *
      * <p>If the constructor's declaring class is an inner class in a
      * non-static context, the first argument to the constructor needs
      * to be the enclosing instance; see section 15.9.3 of
      * <cite>The Java&trade; Language Specification</cite>.
      *
      * <p>If the required access and argument checks succeed and the
      * instantiation will proceed, the constructor's declaring class
      * is initialized if it has not already been initialized.
      *
      * <p>If the constructor completes normally, returns the newly
      * created and initialized instance.
      *
      * @param initargs array of objects to be passed as arguments to
      * the constructor call; values of primitive types are wrapped in
      * a wrapper object of the appropriate type (e.g. a {@code float}
      * in a {@link java.lang.Float Float})
      *
      * @return a new object created by calling the constructor
      * this object represents
      *
      * @exception IllegalAccessException    if this {@code Constructor} object
      *              is enforcing Java language access control and the underlying
      *              constructor is inaccessible.
      * @exception IllegalArgumentException  if the number of actual
      *              and formal parameters differ; if an unwrapping
      *              conversion for primitive arguments fails; or if,
      *              after possible unwrapping, a parameter value
      *              cannot be converted to the corresponding formal
      *              parameter type by a method invocation conversion; if
      *              this constructor pertains to an enum type.
      * @exception InstantiationException    if the class that declares the
      *              underlying constructor represents an abstract class.
      * @exception InvocationTargetException if the underlying constructor
      *              throws an exception.
      * @exception ExceptionInInitializerError if the initialization provoked
      *              by this method fails.
      */
     @CallerSensitive
     @ForceInline // to ensure Reflection.getCallerClass optimization
     public T newInstance(Object ... initargs)
         throws InstantiationException, IllegalAccessException,
                IllegalArgumentException, InvocationTargetException
     {
         Class<?> caller = override ? null : Reflection.getCallerClass();
         return newInstanceWithCaller(initargs, !override, caller);
     }