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How can I call a method on an object using the Reflection API?

How do I call a method (like a setter inside an object class) on an already existing object using Java reflection?

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Here's the way:



Object yourObject = ...;
Class clazz = yourObject.getClass();
Method setter = clazz.getMethod("setString", String.class); // You need to specify the parameter types
Object[] params = new Object[]{"New String"};
setter.invoke(this, params); // 'this' represents the class from were you calling that method.
// If you have a static method you can pass 'null' instead.
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You have a great tutorial HERE .



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See Reflex Countdown .

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You can do it,

Class cls = obj.getClass();
Method m = cls.getMethod("yourMethod", String.class); // assuming there is a method of signature yourMethod(String x);
m.invoke(obj, "strValue");
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