debug9_4.java

程序练习中包括书中实例程序代码和练习中要用到的代码,是压缩文件

package questions.c9;
interface Switch {
   public void on();
   public void off();
}
public class Debug9_4 {
   public static void main( String[] args ) {
      Switch s = new Switch() {
         public Switch() {
            ON_MSG = "Switch on";
            OFF_MSG = "Switch off";
         }
         public void on() {
            System.out.println( ON_MSG );
         }
         public void off() {
            System.out.println( OFF_MSG );
         }
         final String ON_MSG;
         final String OFF_MSG;
      };
      s.on();
      s.off();
   }
}