执行下面的程序的输出结果为

public class Test {
    public static void main(String[] args) {
        String s1 = "HelloWorld";
        String s2 = new String("HelloWorld");
        if (s1 == s2) {
            System.out.println("s1 == s2");
        } else {
            System.out.println("s1 != s2");
        }
        if (s1.equals(s2)) {
            System.out.println("s1 equals s2");
        } else {
            System.out.println("s1 not equals s2");
        }
    }
}