~~java匿名内部类型，求大牛解释,比较有挑战性~~

[庚武讲堂]

查看hibernate源碼发现：

/**  from: spring-framework-2.5.6.jar  **/
/*      */ public class HibernateTemplate extends HibernateAccessor
/*      */   implements HibernateOperations
/*      */ {

//...............

/*      */   public Object get(String entityName, Serializable id, LockMode lockMode)
/*      */     throws DataAccessException
/*      */   {
/*  544 */     return executeWithNativeSession(new HibernateCallback(lockMode, entityName, id) {
/*      */       public Object doInHibernate(org.hibernate.Session session) throws HibernateException {
/*  546 */         if (this.val$lockMode != null) {
/*  547 */           return session.get(this.val$entityName, this.val$id, this.val$lockMode);
/*      */         }
/*      */ 
/*  550 */         return session.get(this.val$entityName, this.val$id);
/*      */       }
/*      */     });
/*      */   }

//...........

/** from: spring-framework-2.5.6.jar **/
public abstract interface HibernateCallback
{
  public abstract Object doInHibernate(Session paramSession)
    throws HibernateException, SQLException;
}

HibernateTemplate 类的get方法使用了匿名内部类，HibernateCallback是接口。
疑问是：new HibernateCallback(lockMode, entityName, id)为什么可以带参数？
其它地方还可以带其它不同个数的参数，求大牛解释。

java的接口有这种用法吗？


我自己写的为什么不行：

/*********  StuffAdd.java    ***********/
package com.fooo.interfacedemo;

public class StuffAdd {

	private String data;
	
	public void add(Object o){
		this.data += o.toString();
	}

	public String getData() {
		return data;
	}

	public void setData(String data) {
		this.data = data;
	}
	
}
/*********  IFooInterface .java    ***********/

package com.fooo.interfacedemo;

public abstract interface IFooInterface {

	public abstract String doFoo(StuffAdd s);
	
}

/*********  FooInterfaceClient .java    ***********/
package com.fooo.interfacedemo;

public class FooInterfaceClient {

	private StuffAdd sa;

	public StuffAdd getSa() {
		return sa;
	}

	public void setSa(StuffAdd sa) {
		this.sa = sa;
	}

	public Object foo1(IFooInterface inter) {
		return inter.doFoo(sa);
	}

}



/*********  TestIFooInterface .java    ***********/
package com.fooo.interfacedemo;

public class TestIFooInterface {
	
	
	private static void doFun(final int a,final String b, final float c){

		FooInterfaceClient client = new FooInterfaceClient();
		StuffAdd sa = new StuffAdd();
		client.setSa(sa);
		client.foo1(new IFooInterface(a,b,c) {
			
			public String doFoo(StuffAdd s) {
				s.add(a);
				s.add(b);
				s.add(c);
				
				System.out.println(s.getData().toString());
			}
		});
		
	}
	

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		
		doFun(1,"2",3.3f);

	}

}

[庚武讲堂]

The constructor Object(int, String, float) is undefined

报错。
上面的逻辑有一点问题，少了一句：

client.foo1(new IFooInterface(a,b,c) {
			
			public String doFoo(StuffAdd s) {
				s.add(a);
				s.add(b);
				s.add(c);
				
				System.out.println(s.getData().toString());
				return s.getData(); //added
			}
		});

[庚武讲堂]

顶起来~~

[sdojqy1122]

abstract class IFooInterface {
	IFooInterface(int a,String b,float c){
		
	}
    public abstract String doFoo(StuffAdd s);
    
}

加上构造方法，亲

[庚武讲堂]

关键是spring的HibernateCallback接口无构造也可以，亲~