关于ObjectUtils.isEmpty() 和 null 的区别

public class IsEmptyTest {
    public static void main(String[] args) {
        String s1 = new String();
        String s2 = "abc";
        String s3 = "";
        System.out.println(s1 == null);
        System.out.println(ObjectUtils.isEmpty(s1));
        System.out.println("---------------");
        System.out.println(s2 == null);
        System.out.println(ObjectUtils.isEmpty(s2));
        System.out.println("---------------");
        System.out.println(s3 == null);
        System.out.println(ObjectUtils.isEmpty(s3));
    }
false
true
---------------
false
false
---------------
false
true