How to use

toClass

method

in

org.apache.commons.lang3.ClassUtils

/**
 * 反射调用对象方法, 无视private/protected修饰符.
 * 
 * 根据传入参数的实际类型进行匹配, 支持方法参数定义是接口，父类，原子类型等情况
 * 
 * 性能较差，仅用于单次调用.
 */
public static <T> T invokeMethod(Object obj, String methodName, Object... args) {
  Object[] theArgs = ArrayUtils.nullToEmpty(args);
  final Class<?>[] parameterTypes = ClassUtils.toClass(theArgs);
  return invokeMethod(obj, methodName, theArgs, parameterTypes);
}

/**
 * <p>Invokes a method with no parameters.</p>
 *
 * <p>This uses reflection to invoke the method obtained from a call to
 * {@link #getAccessibleMethod}(Class,String,Class[])}.</p>
 *
 * @param object invoke method on this object
 * @param methodName get method with this name
 * @param args use these arguments - treat null as empty array
 * @return The value returned by the invoked method
 *
 * @throws NoSuchMethodException if there is no such accessible method
 * @throws InvocationTargetException wraps an exception thrown by the
 *  method invoked
 * @throws IllegalAccessException if the requested method is not accessible
 *  via reflection
 */
public static Object invokeExactMethod(final Object object, final String methodName,
    Object... args) throws NoSuchMethodException,
    IllegalAccessException, InvocationTargetException {
  args = ArrayUtils.nullToEmpty(args);
  final Class<?>[] parameterTypes = ClassUtils.toClass(args);
  return invokeExactMethod(object, methodName, args, parameterTypes);
}

/**
 * <p>Invokes a {@code static} method whose parameter types match exactly the object
 * types.</p>
 *
 * <p>This uses reflection to invoke the method obtained from a call to
 * {@link #getAccessibleMethod(Class, String, Class[])}.</p>
 *
 * @param cls invoke static method on this class
 * @param methodName get method with this name
 * @param args use these arguments - treat {@code null} as empty array
 * @return The value returned by the invoked method
 *
 * @throws NoSuchMethodException if there is no such accessible method
 * @throws InvocationTargetException wraps an exception thrown by the
 *  method invoked
 * @throws IllegalAccessException if the requested method is not accessible
 *  via reflection
 */
public static Object invokeExactStaticMethod(final Class<?> cls, final String methodName,
    Object... args) throws NoSuchMethodException,
    IllegalAccessException, InvocationTargetException {
  args = ArrayUtils.nullToEmpty(args);
  final Class<?>[] parameterTypes = ClassUtils.toClass(args);
  return invokeExactStaticMethod(cls, methodName, args, parameterTypes);
}

/**
 * <p>Returns a new instance of the specified class inferring the right constructor
 * from the types of the arguments.</p>
 *
 * <p>This locates and calls a constructor.
 * The constructor signature must match the argument types by assignment compatibility.</p>
 *
 * @param <T> the type to be constructed
 * @param cls  the class to be constructed, not {@code null}
 * @param args  the array of arguments, {@code null} treated as empty
 * @return new instance of {@code cls}, not {@code null}
 *
 * @throws NullPointerException if {@code cls} is {@code null}
 * @throws NoSuchMethodException if a matching constructor cannot be found
 * @throws IllegalAccessException if invocation is not permitted by security
 * @throws InvocationTargetException if an error occurs on invocation
 * @throws InstantiationException if an error occurs on instantiation
 * @see #invokeConstructor(java.lang.Class, java.lang.Object[], java.lang.Class[])
 */
public static <T> T invokeConstructor(final Class<T> cls, Object... args)
    throws NoSuchMethodException, IllegalAccessException, InvocationTargetException,
    InstantiationException {
  args = ArrayUtils.nullToEmpty(args);
  final Class<?> parameterTypes[] = ClassUtils.toClass(args);
  return invokeConstructor(cls, args, parameterTypes);
}

/**
 * <p>Returns a new instance of the specified class inferring the right constructor
 * from the types of the arguments.</p>
 *
 * <p>This locates and calls a constructor.
 * The constructor signature must match the argument types exactly.</p>
 *
 * @param <T> the type to be constructed
 * @param cls the class to be constructed, not {@code null}
 * @param args the array of arguments, {@code null} treated as empty
 * @return new instance of {@code cls}, not {@code null}
 *
 * @throws NullPointerException if {@code cls} is {@code null}
 * @throws NoSuchMethodException if a matching constructor cannot be found
 * @throws IllegalAccessException if invocation is not permitted by security
 * @throws InvocationTargetException if an error occurs on invocation
 * @throws InstantiationException if an error occurs on instantiation
 * @see #invokeExactConstructor(java.lang.Class, java.lang.Object[], java.lang.Class[])
 */
public static <T> T invokeExactConstructor(final Class<T> cls, Object... args)
    throws NoSuchMethodException, IllegalAccessException, InvocationTargetException,
    InstantiationException {
  args = ArrayUtils.nullToEmpty(args);
  final Class<?> parameterTypes[] = ClassUtils.toClass(args);
  return invokeExactConstructor(cls, args, parameterTypes);
}

/**
 * <p>Invokes a named method whose parameter type matches the object type.</p>
 *
 * <p>This method delegates the method search to {@link #getMatchingAccessibleMethod(Class, String, Class[])}.</p>
 *
 * <p>This method supports calls to methods taking primitive parameters
 * via passing in wrapping classes. So, for example, a {@code Boolean} object
 * would match a {@code boolean} primitive.</p>
 *
 * <p>This is a convenient wrapper for
 * {@link #invokeMethod(Object object,String methodName, Object[] args, Class[] parameterTypes)}.
 * </p>
 *
 * @param object invoke method on this object
 * @param methodName get method with this name
 * @param args use these arguments - treat null as empty array
 * @return The value returned by the invoked method
 *
 * @throws NoSuchMethodException if there is no such accessible method
 * @throws InvocationTargetException wraps an exception thrown by the method invoked
 * @throws IllegalAccessException if the requested method is not accessible via reflection
 */
public static Object invokeMethod(final Object object, final String methodName,
    Object... args) throws NoSuchMethodException,
    IllegalAccessException, InvocationTargetException {
  args = ArrayUtils.nullToEmpty(args);
  final Class<?>[] parameterTypes = ClassUtils.toClass(args);
  return invokeMethod(object, methodName, args, parameterTypes);
}

/**
 * <p>Invokes a named method whose parameter type matches the object type.</p>
 *
 * <p>This method supports calls to methods taking primitive parameters
 * via passing in wrapping classes. So, for example, a {@code Boolean} object
 * would match a {@code boolean} primitive.</p>
 *
 * <p>This is a convenient wrapper for
 * {@link #invokeMethod(Object object,boolean forceAccess,String methodName, Object[] args, Class[] parameterTypes)}.
 * </p>
 *
 * @param object invoke method on this object
 * @param forceAccess force access to invoke method even if it's not accessible
 * @param methodName get method with this name
 * @param args use these arguments - treat null as empty array
 * @return The value returned by the invoked method
 *
 * @throws NoSuchMethodException if there is no such accessible method
 * @throws InvocationTargetException wraps an exception thrown by the method invoked
 * @throws IllegalAccessException if the requested method is not accessible via reflection
 *
 * @since 3.5
 */
public static Object invokeMethod(final Object object, final boolean forceAccess, final String methodName,
    Object... args) throws NoSuchMethodException,
    IllegalAccessException, InvocationTargetException {
  args = ArrayUtils.nullToEmpty(args);
  final Class<?>[] parameterTypes = ClassUtils.toClass(args);
  return invokeMethod(object, forceAccess, methodName, args, parameterTypes);
}

  IllegalAccessException, InvocationTargetException {
args = ArrayUtils.nullToEmpty(args);
final Class<?>[] parameterTypes = ClassUtils.toClass(args);
return invokeStaticMethod(cls, methodName, args, parameterTypes);

  @Test
  public void testToClass_object() {
//        assertNull(ClassUtils.toClass(null)); // generates warning
    assertNull(ClassUtils.toClass((Object[]) null)); // equivalent explicit cast

    // Additional varargs tests
    assertTrue("empty -> empty", Arrays.equals(ArrayUtils.EMPTY_CLASS_ARRAY, ClassUtils.toClass()));
    final Class<?>[] castNull = ClassUtils.toClass((Object) null); // == new Object[]{null}
    assertTrue("(Object)null -> [null]", Arrays.equals(new Object[]{null}, castNull));

    assertSame(ArrayUtils.EMPTY_CLASS_ARRAY, ClassUtils.toClass(ArrayUtils.EMPTY_OBJECT_ARRAY));

    assertTrue(Arrays.equals(new Class[] { String.class, Integer.class, Double.class },
        ClassUtils.toClass("Test", Integer.valueOf(1), Double.valueOf(99d))));

    assertTrue(Arrays.equals(new Class[] { String.class, null, Double.class },
        ClassUtils.toClass("Test", null, Double.valueOf(99d))));
  }

/**
 * 直接调用对象方法, 无视private/protected修饰符.
 * 
 * 根据传入参数的实际类型进行匹配
 */
public static <T> T invokeMethod(Object obj, String methodName, Object... args) {
  Object[] theArgs = ArrayUtils.nullToEmpty(args);
  final Class<?>[] parameterTypes = ClassUtils.toClass(theArgs);
  return (T) invokeMethod(obj, methodName, theArgs, parameterTypes);
}

/**
 * 直接调用对象方法, 无视private/protected修饰符.
 * 
 * 根据传入参数的实际类型进行匹配
 */
public static <T> T invokeMethod(Object obj, String methodName, Object... args) {
  Object[] theArgs = ArrayUtils.nullToEmpty(args);
  final Class<?>[] parameterTypes = ClassUtils.toClass(theArgs);
  return (T) invokeMethod(obj, methodName, theArgs, parameterTypes);
}

/**
 * 反射调用对象方法, 无视private/protected修饰符.
 * 
 * 根据传入参数的实际类型进行匹配, 支持方法参数定义是接口，父类，原子类型等情况
 * 
 * 性能较差，仅用于单次调用.
 */
public static <T> T invokeMethod(Object obj, String methodName, Object... args) {
  Object[] theArgs = ArrayUtils.nullToEmpty(args);
  final Class<?>[] parameterTypes = ClassUtils.toClass(theArgs);
  return invokeMethod(obj, methodName, theArgs, parameterTypes);
}

/**
 * <p>Invokes a method with no parameters.</p>
 *
 * <p>This uses reflection to invoke the method obtained from a call to
 * {@link #getAccessibleMethod}(Class,String,Class[])}.</p>
 *
 * @param object invoke method on this object
 * @param methodName get method with this name
 * @param args use these arguments - treat null as empty array
 * @return The value returned by the invoked method
 *
 * @throws NoSuchMethodException if there is no such accessible method
 * @throws InvocationTargetException wraps an exception thrown by the
 *  method invoked
 * @throws IllegalAccessException if the requested method is not accessible
 *  via reflection
 */
public static Object invokeExactMethod(final Object object, final String methodName,
    Object... args) throws NoSuchMethodException,
    IllegalAccessException, InvocationTargetException {
  args = ArrayUtils.nullToEmpty(args);
  final Class<?>[] parameterTypes = ClassUtils.toClass(args);
  return invokeExactMethod(object, methodName, args, parameterTypes);
}

/**
 * <p>Invokes a method with no parameters.</p>
 *
 * <p>This uses reflection to invoke the method obtained from a call to
 * {@link #getAccessibleMethod}(Class,String,Class[])}.</p>
 *
 * @param object invoke method on this object
 * @param methodName get method with this name
 * @param args use these arguments - treat null as empty array
 * @return The value returned by the invoked method
 *
 * @throws NoSuchMethodException if there is no such accessible method
 * @throws InvocationTargetException wraps an exception thrown by the
 *  method invoked
 * @throws IllegalAccessException if the requested method is not accessible
 *  via reflection
 */
public static Object invokeExactMethod(final Object object, final String methodName,
    Object... args) throws NoSuchMethodException,
    IllegalAccessException, InvocationTargetException {
  args = ArrayUtils.nullToEmpty(args);
  final Class<?>[] parameterTypes = ClassUtils.toClass(args);
  return invokeExactMethod(object, methodName, args, parameterTypes);
}

/**
 * <p>Returns a new instance of the specified class inferring the right constructor
 * from the types of the arguments.</p>
 *
 * <p>This locates and calls a constructor.
 * The constructor signature must match the argument types exactly.</p>
 *
 * @param <T> the type to be constructed
 * @param cls the class to be constructed, not {@code null}
 * @param args the array of arguments, {@code null} treated as empty
 * @return new instance of {@code cls}, not {@code null}
 *
 * @throws NullPointerException if {@code cls} is {@code null}
 * @throws NoSuchMethodException if a matching constructor cannot be found
 * @throws IllegalAccessException if invocation is not permitted by security
 * @throws InvocationTargetException if an error occurs on invocation
 * @throws InstantiationException if an error occurs on instantiation
 * @see #invokeExactConstructor(java.lang.Class, java.lang.Object[], java.lang.Class[])
 */
public static <T> T invokeExactConstructor(final Class<T> cls, Object... args)
    throws NoSuchMethodException, IllegalAccessException, InvocationTargetException,
    InstantiationException {
  args = ArrayUtils.nullToEmpty(args);
  final Class<?> parameterTypes[] = ClassUtils.toClass(args);
  return invokeExactConstructor(cls, args, parameterTypes);
}

/**
 * <p>Returns a new instance of the specified class inferring the right constructor
 * from the types of the arguments.</p>
 *
 * <p>This locates and calls a constructor.
 * The constructor signature must match the argument types by assignment compatibility.</p>
 *
 * @param <T> the type to be constructed
 * @param cls  the class to be constructed, not {@code null}
 * @param args  the array of arguments, {@code null} treated as empty
 * @return new instance of {@code cls}, not {@code null}
 *
 * @throws NullPointerException if {@code cls} is {@code null}
 * @throws NoSuchMethodException if a matching constructor cannot be found
 * @throws IllegalAccessException if invocation is not permitted by security
 * @throws InvocationTargetException if an error occurs on invocation
 * @throws InstantiationException if an error occurs on instantiation
 * @see #invokeConstructor(java.lang.Class, java.lang.Object[], java.lang.Class[])
 */
public static <T> T invokeConstructor(final Class<T> cls, Object... args)
    throws NoSuchMethodException, IllegalAccessException, InvocationTargetException,
    InstantiationException {
  args = ArrayUtils.nullToEmpty(args);
  final Class<?> parameterTypes[] = ClassUtils.toClass(args);
  return invokeConstructor(cls, args, parameterTypes);
}

/**
 * <p>Invokes a method with no parameters.</p>
 *
 * <p>This uses reflection to invoke the method obtained from a call to
 * {@link #getAccessibleMethod}(Class,String,Class[])}.</p>
 *
 * @param object invoke method on this object
 * @param methodName get method with this name
 * @param args use these arguments - treat null as empty array
 * @return The value returned by the invoked method
 *
 * @throws NoSuchMethodException if there is no such accessible method
 * @throws InvocationTargetException wraps an exception thrown by the
 *  method invoked
 * @throws IllegalAccessException if the requested method is not accessible
 *  via reflection
 */
public static Object invokeExactMethod(final Object object, final String methodName,
    Object... args) throws NoSuchMethodException,
    IllegalAccessException, InvocationTargetException {
  args = ArrayUtils.nullToEmpty(args);
  final Class<?>[] parameterTypes = ClassUtils.toClass(args);
  return invokeExactMethod(object, methodName, args, parameterTypes);
}

/**
 * <p>Invokes a {@code static} method whose parameter types match exactly the object
 * types.</p>
 *
 * <p>This uses reflection to invoke the method obtained from a call to
 * {@link #getAccessibleMethod(Class, String, Class[])}.</p>
 *
 * @param cls invoke static method on this class
 * @param methodName get method with this name
 * @param args use these arguments - treat {@code null} as empty array
 * @return The value returned by the invoked method
 *
 * @throws NoSuchMethodException if there is no such accessible method
 * @throws InvocationTargetException wraps an exception thrown by the
 *  method invoked
 * @throws IllegalAccessException if the requested method is not accessible
 *  via reflection
 */
public static Object invokeExactStaticMethod(final Class<?> cls, final String methodName,
    Object... args) throws NoSuchMethodException,
    IllegalAccessException, InvocationTargetException {
  args = ArrayUtils.nullToEmpty(args);
  final Class<?>[] parameterTypes = ClassUtils.toClass(args);
  return invokeExactStaticMethod(cls, methodName, args, parameterTypes);
}

/**
 * <p>Invokes a {@code static} method whose parameter types match exactly the object
 * types.</p>
 *
 * <p>This uses reflection to invoke the method obtained from a call to
 * {@link #getAccessibleMethod(Class, String, Class[])}.</p>
 *
 * @param cls invoke static method on this class
 * @param methodName get method with this name
 * @param args use these arguments - treat {@code null} as empty array
 * @return The value returned by the invoked method
 *
 * @throws NoSuchMethodException if there is no such accessible method
 * @throws InvocationTargetException wraps an exception thrown by the
 *  method invoked
 * @throws IllegalAccessException if the requested method is not accessible
 *  via reflection
 */
public static Object invokeExactStaticMethod(final Class<?> cls, final String methodName,
    Object... args) throws NoSuchMethodException,
    IllegalAccessException, InvocationTargetException {
  args = ArrayUtils.nullToEmpty(args);
  final Class<?>[] parameterTypes = ClassUtils.toClass(args);
  return invokeExactStaticMethod(cls, methodName, args, parameterTypes);
}

/**
 * <p>Invokes a {@code static} method whose parameter types match exactly the object
 * types.</p>
 *
 * <p>This uses reflection to invoke the method obtained from a call to
 * {@link #getAccessibleMethod(Class, String, Class[])}.</p>
 *
 * @param cls invoke static method on this class
 * @param methodName get method with this name
 * @param args use these arguments - treat {@code null} as empty array
 * @return The value returned by the invoked method
 *
 * @throws NoSuchMethodException if there is no such accessible method
 * @throws InvocationTargetException wraps an exception thrown by the
 *  method invoked
 * @throws IllegalAccessException if the requested method is not accessible
 *  via reflection
 */
public static Object invokeExactStaticMethod(final Class<?> cls, final String methodName,
    Object... args) throws NoSuchMethodException,
    IllegalAccessException, InvocationTargetException {
  args = ArrayUtils.nullToEmpty(args);
  final Class<?>[] parameterTypes = ClassUtils.toClass(args);
  return invokeExactStaticMethod(cls, methodName, args, parameterTypes);
}