public class OuterClass {
  int outerClassField;
  InnerClass ic;

  public OuterClass(int field) {
    outerClassField = field;
    ic = new InnerClass(field*2);
  }
  
  class InnerClass {
    int innerClassField;
    
    public InnerClass(int field) {
      innerClassField = field;
    }
    
    public String toString() {
      return "[innerClassField: "+innerClassField+"]";
    }
  }
  
  public String toString() {
    return "outerClassField: "+outerClassField+" "+ic.toString();
  }
}

class TestOuterClass {
  public static void main(String []args) {
    OuterClass outer = new OuterClass(10);
    System.out.println(outer);
    OuterClass.InnerClass inner = outer.new InnerClass(4);
    System.out.println(inner.toString());
  }
}