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> t backserializable(class<t> 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<t> implements hibernatecallback<list<t>>{
 
 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<t> 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();
 }

}

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