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package playground;
import java.io.*;
public class MyException extends Exception {
  private int id; // a unique id
  private String classname; // the name of the class
  private String method; // the name of the method
  private String message; // a detailed message
  private MyException previous =
   null; // the exception which was caught
  private String separator = "\n"; // line separator
 
  public MyException(int id, String classname, String method,
    String message, MyException previous) {
    this.id        = id;
    this.classname = classname;
    this.method    = method;
    this.message   = message;
    this.previous  = previous;
  } 
   
  public String traceBack() {
    return traceBack("\n");
  } 
  public String traceBack(String sep) {
    this.separator = sep;
    int level = 0;
    MyException e = this;
    String text = line("Calling sequence (top to bottom)");
    while (e != null) {
      level++;
      text += line("--level " + level + "--------------------------------------");
      text += line("Class/Method: " + e.classname + "/" + e.method);
 


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import java.util.*;
import java.text.*;
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package fileIo;  
 
import  java.io.BufferedReader;  
import  java.io.BufferedWriter;  
import  java.io.File;  
import  java.io.FileReader;  
import  java.io.FileWriter;  
 
 public&nb ......
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