浅谈java中定义泛型类和定义泛型方法的写法

浅谈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 (IOExcephttp://tion 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, http://params[i]);

}

}

//3 分页

query.setFirstResult(startIndex);

query.setMaxResults(pageSize);

return query.list();

}

}

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