匿名内部类怎么可以是抽象类？

Question

抽象类不是不可以new吗？看不懂了，求指教button.addMouseListener(new java.awt.event.MouseAdapter()
{   
public void mouseClicked(java.awt.event.MouseEvent e) {    
System.out.println("mouseClicked");
                                         mouseClicked()
}
public void mouseEntered(java.awt.event.MouseEvent e)
{
System.out.println("Entered"); 
}
});MouseAdapter明明是个abstract class啊

Answer 1

你这样想：
new java.awt.event.MouseAdapter()
            {   
                public void mouseClicked(java.awt.event.MouseEvent e) {    
                    System.out.println("mouseClicked");
                                         mouseClicked()
                }
                public void mouseEntered(java.awt.event.MouseEvent e)
                {
                    System.out.println("Entered"); 
                }
            }这其实是在创建一个继承了MouseAdapter这个类的子类的对象，只是这个子类没有名字。也没有必要去定义一个子类才new

Answer 2

http://zhidao.baidu.com/question/256475777.html