java面向对象入门级(2)

class Student extends Person { }

public class TestOverWrite_1 {

public static void main(String[] args) private String school;

public Student() { }

public Student(String name, int age, String school) { }

public void setSchool(String school) { }

public String getInfor() { }

String strInfor = \

\

this.school = school; super(name, age); this.school = school;

return strInfor;

}

{ }

Person p1 = new Person(\System.out.println(p1.getInfor());

Student s1 = new Student(); s1.setName(\s1.setAge(88); s1.setSchool(\

System.out.println(s1.getInfor());

class A { }

class B extends A { }

public class TestPoly_1 {

public void f() { }

System.out.println(\

public void f() { }

System.out.println(\

} /* */

public static void main(String[] args) { }

aa = new A(); aa.f();

A aa = new B(); aa.f();

2009年2月11日17:03:59 假设A派生出B B派生出C

编程实现调用A B C 类对象f方法的函数

class A { }

class B extends A {

public void f() { }

System.out.println(\

public void f() { }

System.out.println(\

}

class C extends B { }

public class TestPoly_2 { } /*

//m函数可以实现调用整个A类族所有对象f方法的功能 public static void m(A aa) { }

public static void main(String[] args) { }

A aa = new A(); B bb = new B(); C cc = new C(); m(aa); m(bb); m(cc); aa.f();

public void f() { }

System.out.println(\

*/

2009年2月11日17:03:59 假设A派生出B B派生出C

编程实现调用A B C 类对象f方法的函数

class A { }

class B extends A { }

class C extends B { }

public void f() { }

System.out.println(\

public void f() { }

System.out.println(\

public void f() { }

System.out.println(\