ClosuresBlog2MapExample.java

public static  List map(List list, Mapping mapping) { 
 
        List result = new ArrayList(); 
        for (T elem : list) { 
            result.add(mapping.apply(elem)); 
        } 
        return result; 
    } 
 
 
    private interface Mapping { 
        U apply(T element); 
    } 
 
    public static void main (String[] args) { 
        List inputList = 
                Arrays.asList("functional", "programming", "with", "closures"); 
 
        Mapping stringToStringLength = 
          new Mapping() { 
            public Integer apply(String element) { 
                return element.length(); 
            } 
        }; 
        List mappedList = map(inputList, stringToStringLength); 
        System.out.println("Initial List: " + inputList); 
        System.out.println("Mapped List: " + mappedList); 
    }