RUBY的类封装，继承，多态简单演示

class Person
def initialize(name,age=18)
@name=name
@age=age
@motherland="China"
end
def talk
puts "my name is " +@name+",age is "+@age.to_s
if @motherland == "China"
puts "I am a China."
else
puts "I am a foreigner."
end
end
attr_writer:motherland
end
p1=Person.new("Kaichuan",20)
p1.talk
p2=Person.new("Ben")
p2.motherland="ABC"
p2.talk

class Student < Person
def talk
puts "I am a student. my name is " +@name+",age is " +@age.to_s
end
end
p3=Student.new("Chengang","25");
p3.talk
p4=Student.new("Ben");
p4.talk

class Worker < Person
def talk
puts "I am a worker. my name is " +@name +",age is " + @age.to_s
end
end
p5=Worker.new("Hiong",30)
p5.talk
p6=Worker.new("Ben")
p6.talk

class Person
def initialize(name,age=18)
@name=name
@age=age
@motherland="China"
end
def talk
puts "my name is " +@name+",age is "+@age.to_s
if @motherland == "China"
puts "I am a China."
else
puts "I am a foreigner."
end
end
attr_writer:motherland
end
p1=Person.new("Kaichuan",20)
p1.talk
p2=Person.new("Ben")
p2.motherland="ABC"
p2.talk

class Student < Person
def talk
puts "I am a student. my name is " +@name+",age is " +@age.to_s
end
end
p3=Student.new("Chengang","25");
p3.talk
p4=Student.new("Ben");
p4.talk

class Worker < Person
def talk
puts "I am a worker. my name is " +@name +",age is " + @age.to_s
end
end
p5=Worker.new("Hiong",30)
p5.talk
p6=Worker.new("Ben")
p6.talk

>ruby hello.rb
my name is Kaichuan,age is 20
I am a China.
my name is Ben,age is 18
I am a foreigner.
I am a student. my name is Chengang,age is 25
I am a student. my name is Ben,age is 18
I am a worker. my name is Hiong,age is 30
I am a worker. my name is Ben,age is 18
>Exit code: 0