RUBY的类封装，继承，多态简单演示-白红宇

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