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class Base
{
 String str="BaseStr";
 String staticstr="Base static str";
 void method()
 {
  System.out.print("BaseMethod");
 }
 static void staticMethod()
 {
  System.out.print("Base Static Method");
 }
}

class Sub extends Base
{
 String str="SubStr";
 String staticstr="Sub static str";
 void method()
 {
  System.out.print("SubMethod");
 }
 static void staticMethod()
 {
  System.out.print("Sub static Method");
 }
}
public class BaseType_SubInstance
{
 public static void main(String[] args)
 {
  Base x=new Sub();
  System.out.println("x.str:"+x.str);  //打印 x.str:BaseStr
  System.out.println("x.staticstr:"+x.staticstr);//打印 x.staticstr:Base static str
  System.out.print("x.method():");
  x.method();         //打印 SubMethod           
  System.out.print("\nx.staticMethod():");
  x.staticMethod(); //打印 Base Static Method
 }
 
}