浅谈java异常链与异常丢失

public class TestT {
 public static void a() throws Exception{  //抛出异常给上级处理
 try {
  b() ;
 } catch (Exception e) {
  throw new Exception(e) ;
 }
 }
 public static void b()  throws Exception{ //抛出异常给上级处理
 try {
  c() ;
 } catch (Exception e) {
  throw new Exception(e);
 }
 }
 public static void c() throws Exception { //抛出异常给上级处理
 try {
  throw new NullPointerException("c 异常链中的空指针异常..") ;
 } catch (NullPointerException e) {
  throw new Exception(e) ;
 }
 } 
 public static void main(String[]args){ 
 try {
  a() ;
 } catch (Exception e) {
  e.printStackTrace();
 }
 
 }
}

public class MyTest {
 public void open() throws Exception{
 throw new Exception(){
  public String toString() {
  return this.getClass().getName()+"CeryImmportException";
  };
 } ; 
 }
 public void close() throws Exception{

 throw new Exception(){
  public String toString() {
  
  return this.getClass().getName()+"close Exception" ;
  };
 } ;
 }
 public void three() throws Exception{
    throw new Exception(){
     public String toString() {
      
      return this.getClass().getName() + "three" ;
     };
    } ; 
 }
 public static void main(String[]agrs){  
 MyTest mt=new MyTest() ;
 try{
 try{
 try{
  mt.open();
   }finally
 {
   System.out.println("delete open"); 
   mt.close() ;
 }
 }
 finally{
  System.out.println("delete close");
  mt.three() ;
  
 }
 }catch(Exception ex){
  ex.printStackTrace(); 
 }
 } 
}