Check if an object is instance of List of given class name

lviggiani Published at Java

36

lviggiani :

Given an Object o and a String className = "org.foo.Foo", I want to check if o is instance of List<className>

I tried this but won't compile:

Class<?> cls = Class.forName(className);
if (o instanceof List<cls>){ // this gives error: cls cannot be resolved to a type
  doSomething();
}

Please note that my inputs are Object o and String className (please mind types).

lviggiani :

Ok, I found a method... it's a little dirty code but it works:

if (o instanceof List<?>){
  ParameterizedType pt = (ParameterizedType)o.getClass().getGenericSuperclass();
  String innerClass = pt.getActualTypeArguments()[0].toString().replace("class ", "");
  System.out.println(innerClass.equals(className)); // true
}

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edited at2020-06-24

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