Write a program, implement the following features:
tags: Java language program design java interface Polymorphism Design Patterns spring
Note that only one B.java file can be created, write a declaration class A, then declare class B
Write an abstract class A, with an abstract method Method1, and a non-abstract method Method2, functionality is printed Class a method2, both public.
Write class B inheritance A. With two specific methods Method1 and Method2, the former prints Class B Method1, the latter first call method method1, then print method Class B Method2.
The main function is also included in class B, which is A obj = new b (); obj.method2 (); what is the result of run? Explain that OBJ is the parent class or a sub-class object?
A.java
public abstract class A{
public abstract void method1();
public void method2() {
System.out.println("class A method2");
}
}
B.java
public class B extends A {
@Override
public void method1() {
// TODO Auto-generated method stub
System.out.println("class B method1");
}
public void method2() {
method1();
System.out.println("class B method2");
}
public static void main(String[] args) {
// TODO Auto-generated method stub
A obj=new B();
obj.method2();
}
}
operation result:
The parent class object, the subclass expands the object.
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