Searching in a ArrayList with custom objects for certain strings

Question

I have a ArrayList with custom objects. I want to search inside this ArrayList for Strings.

The class for the objects look like this:

public class Da         


        

Answer 1

UPDATE: Using Java 8 Syntax

List myList = new ArrayList<>();
//Fill up myList with your Data Points

List dataPointsCalledJohn = 
    myList
    .stream()
    .filter(p-> p.getName().equals(("john")))
    .collect(Collectors.toList());

If you don't mind using an external libaray - you can use Predicates from the Google Guava library as follows:

class DataPoint {
    String name;

    String getName() { return name; }
}

Predicate nameEqualsTo(final String name) {
    return new Predicate() {

        public boolean apply(DataPoint dataPoint) {
            return dataPoint.getName().equals(name);
        }
    };
}

public void main(String[] args) throws Exception {

    List myList = new ArrayList();
    //Fill up myList with your Data Points

    Collection dataPointsCalledJohn =
            Collections2.filter(myList, nameEqualsTo("john"));

}