初学java之异常类

//异常类
package st;
public class example_1
{
    public static void main(String args[])
    {
        int n=0,m=0,t=1000;
        try
        {
            m=Integer.parseInt("8888");
            n=Integer.parseInt("ab89");
            t=7777;  //t没有机会被赋值
        }
        catch(NumberFormatException e)
        {
          System.out.println("发生异常："+    e.getMessage());
        }
        System.out.println("n="+n+",m="+m+",t="+t);
        try
        {
            System.out.println("故意抛出I/O异常！");
            throw new java.io.IOException("我是故意的"); //故意抛出异常
            
        }
        catch(java.io.IOException e)
        {
          System.out.println("发生异常:"+e.getMessage());
        }
    }
}

/*
发生异常：For input string: "ab89"
n=0,m=8888,t=1000
故意抛出I/O异常！
发生异常:我是故意的

*/

package st ;
 /*  和接口有关的匿名类  */
interface SpeakHello
{
  void speak();
}
class HelloMachine
{
    public void turnon(SpeakHello hello)
    {
        hello.speak();
    }
}
public class example_1
{
    public static void main(String args[])
    {
     HelloMachine machine =new HelloMachine();
      machine.turnon( new SpeakHello(){
       public void speak(){
         System.out.println("hello ,you are welcome !");
       }
     }
    );
    machine.turnon( new SpeakHello()
    {
        public void speak()
        {
            System.out.println("你好，欢迎光临！");    
        }
    }
    );
    }
}

/*
hello ,you are welcome !
你好，欢迎光临！

*/