32.哈希值
Student student = new Student("學生1", 11); System.out.println(student.hashCode());//356573597 String s1="信息"; String s2="科技"; String s3="重地"; String s4="通话"; System.out.println(s1.hashCode());//658606 System.out.println(s2.hashCode());//991951 System.out.println(s3.hashCode());//1179395