1-ruby-vs-java-setter-getter.rb

class A
  def set_foo(foo)
    @foo = foo
  end
  
  def get_foo
    @foo
  end
  
  def set_bar(bar)
    @bar = bar
  end
  
  def get_bar
    @bar
  end
    
  def set_boo(boo)
    @boo = boo
  end
  
  def get_boo
    @boo
  end
  
  def to_s; "#{@foo}, #{@bar}, #{@boo}" end
end


a = A.new
a.set_foo 'Foo!!'
a.set_boo 'Boo!!'
a.set_bar 'Bar!!'
puts a

2-ruby-vs-java-setter-getter.rb

class A
  [:foo, :bar, :boo].each do |attr|
    define_method("set_#{attr}") do |value|
      instance_variable_set("@#{attr}", value)
    end
    
    define_method("get_#{attr}") do
      instance_variable_get("@#{attr}")
    end
  end
  
  def to_s; "#{@foo}, #{@bar}, #{@boo}" end
end


a = A.new
a.set_foo 'Foo!!'
a.set_boo 'Boo!!'
a.set_bar 'Bar!!'
puts a

3-ruby-vs-java-setter-getter.rb

class A
  [:foo, :bar, :boo].each do |attr|
    define_method("#{attr}=") do |value|
      instance_variable_set("@#{attr}", value)
    end
    
    define_method("#{attr}") do
      instance_variable_get("@#{attr}")
    end
  end
  
  def to_s; "#{@foo}, #{@bar}, #{@boo}" end
end


a = A.new
a.foo = 'Foo!!'
a.boo = 'Boo!!'
a.bar = 'Bar!!'
puts a

4-ruby-vs-java-setter-getter.rb

class A
  attr_accessor :foo, :bar, :boo

  def to_s; "#{@foo}, #{@bar}, #{@boo}" end
end


a = A.new
a.foo = 'Foo!!'
a.boo = 'Boo!!'
a.bar = 'Bar!!'
puts a