JAVA泛型及垃圾回收的简单例子

import java.util.Hashtable;

public class GenDemo<K,V,T> {
//这里K,V,T代表类型
	private T t;
	private Hashtable<K,V> h = new Hashtable<K,V>();
	public void put(K k, V v){
		h.put(k, v);
	}
	public V get(K k){
		return h.get(k);
	}
	public T get(){
		return t;
		
	}
	
	public static void main(String[] args) {
		GenDemo<String,String,String> t =new GenDemo<String,String,String>();
		t.put("key", "value");
		System.out.println(t.get("key"));
		
	}

}

import java.io.FileInputStream;
import java.io.IOException;

public class ClearupDemo {

	private FileInputStream fileinput;
	public synchronized void clearup() throws IOException{ //写一个自己的对象回收机制
		if(fileinput!=null){
			fileinput.close();
			fileinput = null;
		}
	}
	protected void finalize() throws Throwable{ //覆盖Object的finalize方法
		try{
			clearup();
		} catch (IOException e) {
			e.printStackTrace();
		}
		finally{
			super.finalize();
		}
	}
	
}