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();
}
}