Java 类型接口

package com.codingdict;

public class GenericsTester {
   public static void main(String[] args) {
      //type inference   
      Box<Integer> integerBox = new Box<>();
      //unchecked conversion warning
      Box<String> stringBox = new Box<String>();

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

      System.out.printf("Integer Value :%d\n", integerBox.get());
      System.out.printf("String Value :%s\n", stringBox.get());
   }
}

class Box<T> {
   private T t;

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

   public T get() {
      return t;
   }   
}