java中定义泛型类和定义泛型方法的写法

1.方法中的泛型

public static  T backSerializable(Class clazz , String path ,String fileName){
		
		FileInputStream fis = null;
		ObjectInputStream ois = null;
		Object obj = null;
		
		try {
			
			fis = new FileInputStream(path + fileName);
			ois = new ObjectInputStream(fis);
			obj = ois.readObject();
			
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			
			try {
				if( fis!=null) fis.close();
				if( ois!=null) ois.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			
			
		}
		
		
		
		return (T)obj;
	}
	

2.定义泛型类

public class PageHibernateCallback implements HibernateCallback>{
	
	private String hql;
	private Object[] params;
	private int startIndex;
	private int pageSize;
	

	public PageHibernateCallback(String hql, Object[] params,
			int startIndex, int pageSize) {
		super();
		this.hql = hql;
		this.params = params;
		this.startIndex = startIndex;
		this.pageSize = pageSize;
	}



	public List doInHibernate(Session session) throws HibernateException,
			SQLException {
		//1 执行hql语句
		Query query = session.createQuery(hql);
		//2 实际参数
		if(params != null){
			for(int i = 0 ; i < params.length ; i ++){
				query.setParameter(i, params[i]);
			}
		}
		//3 分页
		query.setFirstResult(startIndex);
		query.setMaxResults(pageSize);
		
		return query.list();
	}

}