How to search in a List of Java object

I have a List of object and the list is very big. The object is

class Sample {
    String value1;
    String value2;
    String value3;
    String value4;
    String value5;
 }

Now I have to search for a specific value of an object in the list. Say if value3=='three' I have to return those objects (My search is not always based on value3)

The list is

List<Sample> list = new ArrayList<Sample>();

What is the efficient way of doing it?