Java中匿名子类 的 匿名对象、匿名子类 的 非匿名对象、非匿名类 的 匿名对象、非匿名类 的 非匿名对象

/*** @Author: YuShiwen* @Date: 2020/11/18 2:06 PM* @Version: 1.0*/publicclassAnonymousTest {
publicstaticvoidmain(String[] args) {
//非匿名类 的 非匿名对象，即类名为Freshman，对象名为：freshmanFreshmanfreshman=newFreshman("Mr.Yu",18);
freshman.setUniversity();
System.out.println(freshman);
//非匿名类 的 匿名对象，即new Freshman("Ms.cheng", 18),知其类名为Freshman，对象名匿名了freshman.printStudent((newFreshman("Ms.cheng", 18)));
//匿名子类 的 非匿名对象，即以下语句，// 知其父类名为Student，不知其子类名，创建了子类对象名为：firstClassStudent 用父类接收StudentfirstClassStudent=newStudent("小明",19) {
@OverridepublicvoidsetUniversity() {
this.school="Tsinghua University";
            }
        };
firstClassStudent.setUniversity();
System.out.println(firstClassStudent);
//匿名子类 的 匿名对象，即以下语句// 知其父类名为Student，不知其子类名，用子类创建对象,也不知其对象名freshman.printStudent(newStudent("小华",18) {
@OverridepublicvoidsetUniversity() {
this.school="Peking University";
            }
        });
    }
}
//抽象类abstractclassStudent{
Stringname;
intage;
Stringschool;
publicStudent() {
    }
publicStudent(Stringname, intage) {
this.name=name;
this.age=age;
    }
@OverridepublicStringtoString() {
return"Student{"+"name='"+name+'\''+", age="+age+", school='"+school+'\''+'}';
    }
publicabstractvoidsetUniversity();
}
classFreshmanextendsStudent{
publicFreshman() {
    }
publicFreshman(Stringname, intage) {
super(name, age);
    }
@OverridepublicvoidsetUniversity() {
this.school="Yangtze University";
    }
publicvoidprintStudent(Studentstudent){
System.out.println(student);
    }
}

Student{name='Mr.Yu', age=18, school='Yangtze University'}
Student{name='Ms.cheng', age=18, school='null'}
Student{name='小明', age=19, school='Tsinghua University'}
Student{name='小华', age=18, school='null'}
Processfinishedwithexitcode0