java异常处理

package wo;import java.math.*;import java.lang.*;import java.text.DateFormat;import java.util.*;import java.io.*;public class Da {/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubString s="session";int c;try{while((c=System.in.read())!=-1){if(c=='a')throw new Exception("a有问题");System.out.println(c);}}catch(IOException e){System.out.println("e");}catch(Exception e){System.out.println("e");}byte y=1,i=1;for(i=1;i<=10;i++){System.out.print(i+"!=");try{if(y>Byte.MAX_VALUE/i)throw new myexception("overflow!");else{y=(byte)(y*i);System.out.println(y);}}catch(myexception e){e.printmeg();}}}}class myexception extends Exception{public myexception(String s){super(s);}public void printmeg(){System.out.println("myexception:"+this.getMessage());this.printStackTrace();System.exit(0);}}