Merge Objects using Reflection API

Merging the two objects using Reflection API

For example the class Animal has objects Tiger, Lion, following is show how to merge these objects using Reflection API

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class Animal { private name; private age; private weight; ..setter/getters }

Main class

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Class Main { public static void main(String[] args) { Animal tiger = new Animal(); tiger.setName("Tiger"); tiger.setAge("20"); tiger.setWeight("80"); Animal lion = new Animal(); lion.setName("Lion"); lion.setAge("25"); lion.setWeight("120"); merge(tiger,lion); sysout.println(tiger); } public static void merge(Object obj, Object update) { if (!obj.getClass().isAssignableFrom(update.getClass())) { return; } Method[] methods = obj.getClass().getMethods(); for (Method fromMethod : methods) { if (fromMethod.getDeclaringClass().equals(obj.getClass()) && fromMethod.getName().startsWith("get")) { String fromName = fromMethod.getName(); String toName = fromName.replace("get", "set"); try { Method toMetod = obj.getClass().getMethod(toName, fromMethod.getReturnType()); Object value = fromMethod.invoke(update, (Object[]) null); if (value != null) { toMetod.invoke(obj, value); } } catch (Exception e) { e.printStackTrace(); } } } } }

Output:
[Lion, 25, 120]
Tiger objects properties were overriden by Lion object properties.