Java 通用方法擦除

package com.codingdict;

public class GenericsTester {
   public static void main(String[] args) {
      Box<Integer> integerBox = new Box<Integer>();
      Box<String> stringBox = new Box<String>();

      integerBox.add(new Integer(10));
      stringBox.add(new String("Hello World"));

      printBox(integerBox);
      printBox1(stringBox);
   }

   private static <T extends Box> void printBox(T box) {
      System.out.println("Value: " + box.get());
   }

   private static <T> void printBox1(T box) {
      System.out.println("Value: " + ((Box)box).get());
   }
}

class Box<T> {
   private T t;

   public void add(T t) {
      this.t = t;
   }

   public T get() {
      return t;
   }   
}