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1 #全局变量 2 $global_variable=10 3 class Class1 4 def print_global() 5 puts "Global variable in Class1 is #{$global_variable}" 6 end 7 end 8 class1obj=Class1.new 9 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 end 13 end 14 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 end 14 def total_no_of_customers() 15 @@no_of_customers +=1 16 puts "Totla number of customers:#{@@no_of_customers}" 17 end 18 end 19 cust1=Customer.new("1","John","Wisdom") 20 cust2=Customer.new("2","Poul","New") 21 22 cust1.total_no_of_customers 23 cust2.total_no_of_customers
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