getCanonicalName和getSimpleName getName的区别与应用

接口:

package com.test;

public interface Fruit {

}

 

 

一个实现类:

package com.test;

public class Apple implements Fruit {

}

 

基本测试类:

Java代码  

 

    package com.test;  
      
    import java.util.ArrayList;  
    import java.util.List;  
      
    public class TestName {  
        public static void main(String[] args) {  
            Fruit apple=new Apple();  
            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=new Apple[]{};  
            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  
              
            Apple a1=new Apple();  
            Apple a2=new Apple();  
            List<Apple> appleList=new ArrayList<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,Date startDate,Date endDate){
        StringBuilder hql = new StringBuilder("select t from ");
        hql.append(c.getCanonicalName());
        hql.append(" t where t.statTime>=:startTime and t.statTime<:endTime ");

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

        return query.list();
    }

}

 

http://blog.csdn.net/wirelessqa/article/details/8151889