Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.util.*;

public class Main {
    public static <T extends Object> int countIntersection(Collection<? extends T> s1, Collection<? extends T> s2) {
        if (s1 == null || s2 == null)
            return 0;
        int n1 = s1.size();
        int n2 = s2.size();
        if (n2 < n1) {
            Collection<? extends T> t = s1;
            s1 = s2;
            s2 = t;
        }
        int n = 0;
        for (T e : s1) {
            if (s2.contains(e))
                n++;
        }
        return n;
    }

    public static int size(Collection<?> c) {
        return (c == null) ? 0 : c.size();
    }
}