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import java.util.ArrayList; import java.util.List; public class GenDemo { public static void main(String[] args) { List<Integer> grades = new ArrayList<Integer>(); Integer[] gradeValues = { new Integer(96), new Integer(95), new Integer(27), new Integer(100), new Integer(43), new Integer(68) }; for (int i = 0; i < gradeValues.length; i++) grades.add(gradeValues[i]); List<Integer> failedGrades = new ArrayList<Integer>(); copy(grades, failedGrades, new Filter<Integer>() { public boolean accept(Integer grade) { return grade.intValue() <= 50; } }); for (int i = 0; i < failedGrades.size(); i++) System.out.println(failedGrades.get(i)); } static <T> void copy(List<T> src, List<T> dest, Filter<T> filter) { for (int i = 0; i < src.size(); i++) if (filter.accept(src.get(i))) dest.add(src.get(i)); } } interface Filter<T> { boolean accept(T o); } |