1 #全局变量2 $global_variable=103 class Class14     def print_global()5         puts "Global variable in Class1 is #{$global_variable}"6     end7 end8 class1obj=Class1.new9 class1obj.print_global()

 1 #实例变量 2 class Customer 3     def initialize(id,name,addr) 4         @cust_id=id 5         @cust_name=name  6         @cust_addr=addr 7     end 8     def display_detalis 9         puts "Customer id #{@cust_id}"10         puts "Customer name #{@cust_name}"11         puts "Customer addr #{@cust_addr}"12     end13 end14 cust1=Customer.new("1","John","Wisdom")15 cust1.display_detalis

 1 #类变量 2 class Customer 3     @@no_of_customers=0 4     def initialize(id,name,addr) 5         @cust_id=id 6         @cust_name=name 7         @cust_addr=addr 8     end 9     def display_details()10         puts "Customer id #{@cust_id}"11         puts "Customer name #{@cust_name}"12         puts "Customer addr #{@cust_addr}"13     end14     def total_no_of_customers()15         @@no_of_customers +=116         puts "Totla number of customers:#{@@no_of_customers}"17     end18 end19 cust1=Customer.new("1","John","Wisdom")20 cust2=Customer.new("2","Poul","New")21 22 cust1.total_no_of_customers23 cust2.total_no_of_customers