java高薪之路__004_泛型

参考地址：
1. http://www.cnblogs.com/lwbqqyumidi/p/3837629.html2. http://www.cnblogs.com/abcwt112/p/4735068.html3. http://www.cnblogs.com/chyu/p/4630798.html

 package learn.JavaBasics.Class;

 public class GenericDemo {
     private class Test<E> {
         private E i;

         public E get() {
             return this.i;
         }

         public void set(E str) {
             this.i = str;
         }

         public void echo() {
             System.out.println("echo test");
         }
     }

     public interface testInterface<E> {
         public E print();
     }

     /**
      * @param args
      */
     public static void main(String[] args) {
         // TODO Auto-generated method stub
         GenericDemo g = new GenericDemo();

         Test<Integer> a = g.new Test<Integer>();
         a.set(112);
         System.out.println(a.get());

         Test<String> s = g.new Test<String>();
         s.set("hello");
         System.out.println(s.get());

         g.put(a);
         g.put(s);

 //        g.putExtends(a);
         g.putExtends(s);

         g.putSuper(a);
 //        g.putSuper(s);

         System.out.println("*****");

         g.question(a).echo();
         g.question(s).echo();

         String is = new testInterface<String>() {
             @Override
             public String print() {
                 // TODO Auto-generated method stub

                 return "Interface Generic Test";
             }
         }.print();

         System.out.println(is);
     }

     public void put(Test<?> t) {
         System.out.println(t.get());
     }

     public void putExtends(Test<? extends String> t) {
         System.out.println(t.get());
     }

     public void putSuper(Test<? super Integer> t) {
         System.out.println(t.get());
     }

     public Test<?> question(Test<?> t) {
         System.out.println(t);
         return t;
     }
 }