getCanonicalName和getSimpleName getName的区别与应用

接口:

 packagecom.test;

 publicinterfaceFruit{

 }

一个实现类:

 packagecom.test;

 publicclassAppleimplementsFruit{

 }

基本测试类:

 packagecom.test;

 importjava.util.ArrayList;
 importjava.util.List;

 publicclassTestName{
 publicstaticvoidmain(String[]args){
 Fruitapple=newApple();
 System.out.println(apple.getClass().getCanonicalName());//返回com.test.Apple
 System.out.println(apple.getClass().getSimpleName());//Apple
 System.out.println(apple.getClass().getName());//返回com.test.Apple

 Apple[]arrApple=newApple[]{};
 System.out.println(arrApple.getClass().getCanonicalName());//返回com.test.Apple[]
 System.out.println(arrApple.getClass().getSimpleName());//返回Apple[]
 System.out.println(arrApple.getClass().getName());//返回[Lcom.test.Apple;

 System.out.println(String.class.getCanonicalName());//返回java.lang.String
 System.out.println(String.class.getSimpleName());//返回String
 System.out.println(String.class.getName());//返回java.lang.String

 System.out.println(int.class.getCanonicalName());//返回int
 System.out.println(int.class.getSimpleName());//返回int
 System.out.println(int.class.getName());//返回int

 Applea1=newApple();
 Applea2=newApple();
 List<Apple>appleList=newArrayList<Apple>();
 appleList.add(a1);
 appleList.add(a2);
 System.out.println(appleList.getClass().getCanonicalName());//返回java.util.ArrayList
 System.out.println(appleList.getClass().getSimpleName());//返回ArrayList
 System.out.println(appleList.getClass().getName());//返回java.util.ArrayList

 }
 }

实际应用: hql的泛型查询

 public<T>List<T>getRecords(Class<T>c,DatestartDate,DateendDate){
 StringBuilderhql=newStringBuilder("selecttfrom");
 hql.append(c.getCanonicalName());
 hql.append("twheret.statTime>=:startTimeandt.statTime<:endTime");

 Queryquery=sessionFactory.getCurrentSession().createQuery(hql.toString());
 query.setParameter("startTime",startDate);
 query.setParameter("endTime",endDate);

 returnquery.list();
 }
 }