@missingfaktor提到了一种方法，下面是另一种方法（如果知道名称和参数） api）。

One method is mentioned by @missingfaktor and another is below (if you know the name and parameters of the api).

假设您有一种不带args的方法：

Say you have one method which takes no args:

Method methodToFind = null;
try {
  methodToFind = YouClassName.class.getMethod("myMethodToFind", (Class<?>[]) null);
} catch (NoSuchMethodException | SecurityException e) {
  // Your exception handling goes here
}

如果存在则调用它：

if(methodToFind == null) {
   // Method not found.
} else {
   // Method found. You can invoke the method like
   methodToFind.invoke(<object_on_which_to_call_the_method>, (Object[]) null);
}

假设你有一个方法需要原生 int args：

Say you have one method which takes native int args:

Method methodToFind = null;
methodToFind = YouClassName.class.getMethod("myMethodToFind", new Class[] { int.class });

如果存在则调用它：

if(methodToFind == null) {
   // Method not found.
} else {
   // Method found. You can invoke the method like
   methodToFind.invoke(<object_on_which_to_call_the_method>, invoke(this,
      Integer.valueOf(10)));
}

假设您有一个盒装方法整数 args：

Say you have one method which takes boxed Integer args:

Method methodToFind = null;
methodToFind = YouClassName.class.getMethod("myMethodToFind", new Class[] { Integer.class });

如果存在则调用它：

if(methodToFind == null) {
   // Method not found.
} else {
   // Method found. You can invoke the method like
   methodToFind.invoke(<object_on_which_to_call_the_method>, invoke(this,
      Integer.valueOf(10)));
}

使用上面的soln来调用方法不会给你编译错误。
根据@Foumpie更新

Using the above soln to invoke method won't give you compilation errors. Updated as per @Foumpie