使用反射调用Java中的方法，并获取返回值

Question

I want to call a method using reflection.

The method is:

public String format(String text,int value)
{
    return text+" "+value; 
} 

So, it has 2 arguments: a String and an int. And it returns a String. How can I call it?

Answer 1

    try {
        Class<?> type = Foo.class;
        Method method = type.getMethod("format", String.class, int.class);
        //as the method is not static, you need to have an instance of the class to be able to invoke the method
        Foo instance = new Foo();
        String string = (String) method.invoke(instance, "string", 42);
    } catch (Exception toBeHandled) {}

and replace the Foo with the name of your class