JAVA EE: Java Tutorial: Generics in java | Java Generics [Lower bounded wildcard in Java Generics]

Tuesday, 16 May 2017

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Java Tutorial: Generics in java | Java Generics [Lower bounded wildcard in Java Generics]

GenericDemo.java

import java.util.ArrayList;
import java.util.List;

public class GenericDemo
{

    public static void main(String[] args)
    {
        
        List<Integer> integerList = new ArrayList<Integer>();
        addIntegers(integerList);

        List<Number> numberList = new ArrayList<Number>();
        addIntegers(numberList);

    }

    public static void addIntegers(List<? super Integer> list)
    {
        list.add(new Integer(50));
        System.out.println(list);
    }

}