Java泛型嵌套示例

/* 
* 泛型嵌套实例
* date: 2012-10-22
* author: Alex Hohh
*/

// 泛型类Info<K,V>
class Info<K,V>{
private K key;
private V value;

// 构造函数
public Info(K key, V val){
this.key = key;
this.value = val;
}

// 设置key
public void setKey(K k){
this.key = k;
}

// 设置value
public void setValue(V v){
this.value = v;
}

// 获取KEY
public K getKey(){
  return this.key;
}

// 获取value
public V getValue(){
return this.value;
}

// 覆写toString()方法
public String toString(){
return "Key: " + this.key + ", Value : " + this.value;
}
}

// Demo<S>中的S在这代表Info<K,V>,实现泛型嵌套
class Demo<S>{

// 泛型S的对象
private S info;

// Demo构造函数
public Demo(S info){
this.info = info;
}

// 设置S类型的info
public void setInfo(S info){
this.info = info;
}

// 获取info
public S getInfo(){
return this.info;
}
}

// main
public class GenericEmbeded{
public static void main(String args[]){

// 实例化Info类对象
Info<String,Integer> info = new Info<String, Integer>("Alex Hohh",21);
// 实例化Demo类对象,泛型嵌套
Demo< Info<String,Integer> > d = new Demo< Info<String,Integer> >( info );

// 获取Info<K,V>对象后,再调用toString()方法,最后输出.
System.out.print( d.getInfo() );
}
}

输出结果：