java语言程序设计（选修课）

类与对象的基础题1）编程实现设计一个学生类STUDENT，包含的属性有姓名NAME和年龄AGE由学生类派生出本科生类UNDERGRADUATE和研究生类POSTGRADUATE,本科生类包含的属性有专业SPECIALTY等,研究生类包含的属性有研究方向STUDYDIRECTION等。每个类都有相关数据的SET方法和GET方法2）声明测试类声明STUDENT类的数组（含5个元素），生成五个对象存入数组其中二个STUDENT类的对象、二个POSTGRADUATE类的对象、一个UNDERGRADUATE类的对象，打印输出每个对象的某个成员变量。将一个父类的引用指向一个子类对象，用这个塑型后的对象来调用某个方法实现多态性。/声明学生类STUDENTCLASSSTUDENTPRIVATESTRINGNAME/姓名PRIVATEINTAGE/年龄/构造方法PUBLICSTUDENTPUBLICSTUDENTSTRINGNAME,INTAGETHISNAMENAMETHISAGEAGE/GET方法PUBLICSTRINGGETNAMERETURNTHISNAMEPUBLICINTGETAGERETURNTHISAGE/SET方法PUBLICVOIDSETNAMESTRINGNAMETHISNAMENAMEPUBLICVOIDSETAGEINTAGETHISAGEAGEPUBLICVOIDSTUDYSYSTEMOUTPRINTLN“普通学生“/声明本科生类UNDERGRADUATECLASSUNDERGRADUATEEXTENDSSTUDENTPUBLICSTRINGSPECIALTY/专业/构造方法PUBLICUNDERGRADUATEPUBLICUNDERGRADUATESTRINGNAME,INTAGE,STRINGSPECIALTYSUPERNAME,AGETHISSPECIALTYSPECIALTY/GET方法PUBLICSTRINGGETSPECIALTYRETURNTHISSPECIALTY/SET方法PUBLICVOIDSETSPECIALTYTHISSPECIALTYSPECIALTYPUBLICVOIDSTUDYSYSTEMOUTPRINTLN“本科生“/声明研究生类POSTGRADUATECLASSPOSTGRADUATEEXTENDSSTUDENTPUBLICSTRINGSTUDYDIRECTION/研究方向/构造方法PUBLICPOSTGRADUATEPUBLICPOSTGRADUATESTRINGNAME,INTAGE,STRINGSTUDYDIRECTIONSUPERNAME,AGETHISSTUDYDIRECTIONSTUDYDIRECTION/GET方法PUBLICSTRINGGETSTUDYDIRECTIONRETURNSTUDYDIRECTION/SET方法PUBLICVOIDSETSTUDYDIRECTIONTHISSTUDYDIRECTIONSTUDYDIRECTIONPUBLICVOIDSTUDYSYSTEMOUTPRINTLN“研究生“/声明测试类TESTERPUBLICCLASSTESTERPUBLICSTATICVOIDMAINSTRINGARGSINTISTUDENTSTUDENTNEWSTUDENT5STUDENT0NEWSTUDENT“LIMEI“,15STUDENT1NEWSTUDENT“WANGHAI“,18STUDENT2NEWPOSTGRADUATE“WUFAN“,24,“法学“STUDENT3NEWPOSTGRADUATE“ZHANGJIE“,25,“物理学“STUDENT4NEWUNDERGRADUATE“HUANGYUE“,20,“微电子学“FORI0ISTUDENTLENGTHISYSTEMOUTPRINTLN“姓名“STUDENTIGETNAME“年齡“STUDENTIGETAGESTUDENTSTUNEWPOS