泛型设计中的通配符

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wx63086371c7e9c 2022-08-26 23:58:32 博主文章分类：JSE ©著作权

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import java.util.LinkedList;
/** 
 * @ Class GenericDemo.java 
 * @ Description  泛型设计中的通配符
 * @ Company OpenData 
 * @ author Chenlly 
 * @ Version 1.0 
 * @ Date 2009-6-17 下午01:44:45 
 */
interface Box<T>{
 
 public void put(T element);
 
 public T get(int i);
 
 public int size();
}class BoxImpl<T> implements Box<T>{
 
 private LinkedList link = new LinkedList(); private int size;
 
 public T get(int i) {
  return (T)link.get(i);
 } public void put(T element) {
  link.add(element);
  size ++;
 }
 
 public int size(){
  return size;
 }
}
public class GenericDemo {
 public static void main(String []args){
  //字符串
  Box<String> box = new BoxImpl<String>();
  box.put("chen");
  box.put("li");
  for( int i = 0; i<box.size(); i++){
   System.out.println("->"+box.get(i));
  }
  System.out.println("*************************");
  //整数
  Box<Integer> box1 = new BoxImpl<Integer>();
  box1.put(new Integer(1000));
  box1.put(new Integer(1254));
  for( int i = 0; i<box1.size(); i++){
   System.out.println("->"+box1.get(i));
  }
 }
}