Java动态（动态）调用方法

Question

I am a newbie in Java. I want to create a method, that takes the first parameter as Function and the second parameter as a List of Objects as follows:

  public void dynamicMethodExecution(Somefunction someFunction, List<T> params) {
    //Pass the params to the someFunction and execute the someFunction.
  }

If I pass any function and any list of parameters to 'dynamicMethodExecution', then it should execute the function by passing the parameters.

This method 'dynamicMethodExecution' should be as generic as possible, ie it should take any kind of function and execute it on the fly.

Any idea, how can I do this?

Answer 1

If you're sticking with the built-in Function<T, F> class, then the apply method on this class does exactly that. However, as I said in my comment, the Function class only represents 1-ary functions, so functions which take zero arguments or those which take multiple arguments could not be directly represented.

Answer 2

I finally did this. Please share ur view on it.

  public static void asyncMethodInvoke(Class<?> clazz, String methodName, Object[] args) {
    new Thread(new Runnable() {
      @Override
      public void run() {
        try {
          Class<?> params[] = new Class[args.length];
          for (int i = 0; i < params.length; i++) {
            if (args[i] instanceof Byte) {
              params[i] = Byte.TYPE;
            }
            else if(args[i] instanceof Short) {
              params[i] = Short.TYPE;
            }
            else if(args[i] instanceof Character) {
              params[i] = Character.TYPE;
            }
            else if(args[i] instanceof Integer) {
              params[i] = Integer.TYPE;
            }
            else if(args[i] instanceof Float) {
              params[i] = Float.TYPE;
            }
            else if(args[i] instanceof Double) {
              params[i] = Double.TYPE;
            }
            else if(args[i] instanceof Long) {
              params[i] = Long.TYPE;
            }
            else if(args[i] instanceof Boolean) {
              params[i] = Boolean.TYPE;
            }
            else {
              params[i] = args[i].getClass();
            }
          }

          Object _instance = clazz.newInstance();
          Method method = clazz.getDeclaredMethod(methodName, params);
          method.invoke(_instance, args);
        }
        catch (Exception e) {
          System.out.println(e.getCause().getMessage());
        }
      }
    }).start();
  }

I am using Thread to run method asynchronously.