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Java - Use Class parameter in method parameter


Java - Use Class parameter in method parameter

By : ynwest
Date : November 19 2020, 03:01 PM
will be helpful for those in need Why this doesn't work
You are trying to access a generic type at runtime, which does not work in this case, because of type erasure.
code :
public Publisher(Class<T> clazz) {
    if(!SUPPORTED_CLASSES.contains(clazz)) {
        System.out.println("Class not supported!");
    }
}


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Passing Derived class as a parameter to a method when the parameter type is base class

Passing Derived class as a parameter to a method when the parameter type is base class


By : Aleksi Pyykkönen
Date : March 29 2020, 07:55 AM
This might help you I am a newbie and trying to understand concepts of inheritance and design patterns. , Put really simply:
Java Generics - Using the generic type parameter of the enclosing class in a method parameter

Java Generics - Using the generic type parameter of the enclosing class in a method parameter


By : Jesper Petersen
Date : March 29 2020, 07:55 AM
I hope this helps you . Method implements AnnotatedElement, but that doesn't require that T is a method. What if the class is declared as SimpleClass? That satisfies , but doesn't support conversion from Method.
Passing a class with type parameter as type parameter for generic method in Java

Passing a class with type parameter as type parameter for generic method in Java


By : Swanand Deshpande
Date : March 29 2020, 07:55 AM
should help you out This is actually possible in Java, using some "tricks". Don't succumb to pressure from the C# fanatics! (j/k)
The "trick" is to create a class that extends a generic type, and access the value of the type parameter of the parent class through the Type returned by .getGenericSuperclass() or .getGenericInterfaces().
code :
TypeToken<List<String>> stringListTok = new TypeToken<List<String>>() {};
I want to implement generic java method passing argument as class object and defining method parameter as Class<T>

I want to implement generic java method passing argument as class object and defining method parameter as Class<T>


By : Chanh Nguyen
Date : March 29 2020, 07:55 AM
To fix this issue
First of all if T userProfileClass and T wurflDataGenericClass are different types then they should be having different literals as their type. They must be mentioned like T1 userProfileClass and T2 wurflDataGenericClass.
code :
    public class myClass {        
        public String getRtbAd(HttpServletRequest request, T1 userProfileClass, List systemControlDetails, T2 wurflDataGenericClass,String redisConnectionUrl, String dimension, Short rtbTimeOut){     
            }        
        }        
        myClass  a = new myClass();
        String str = a.getRtbAd();
Typescript: Function parameter in Class Method has narrower parameter than in the parent class

Typescript: Function parameter in Class Method has narrower parameter than in the parent class


By : user3495152
Date : March 29 2020, 07:55 AM
To fix this issue You can use generics and manage objects in "type safe" way:
code :
class AnyObjectManager<T> {
    objectList: T[] = [];
    getAnyObject = (matches: (o: T) => boolean) => {
        for (const o of this.objectList) {
            if (matches(o)) {
                return o;
            }
        }
        return null;
    }
}

class NamedObjectManager extends AnyObjectManager<NamedObject> {
    getObjectNamedTim = () => {
        return this.getAnyObject(this.objectIsNamedTim)
    }
    objectIsNamedTim = (namedObject: NamedObject) => {
        return namedObject.name === 'Tim';
    }
}
getAnyObject = (matches: (o: T) => boolean) => this.objectList.find(matches) || null;
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