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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. public class Main {
  8.     public static void main(String[] args) {
  9.         Army army = new Army();
  10.  
  11.         Division division = new Division("8th Infantry Division");
  12.  
  13.         try {
  14.             army.addDivision(division);
  15.         } catch (DivisionValidateException e) {
  16.             e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
  17.         }
  18.  
  19.         try {
  20.             army.addDivision(division);
  21.         } catch (DivisionValidateException e) {
  22.             e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
  23.         }
  24.     }
  25. }
  26.  
  27. class Army {
  28.     private Set<Division> divisions = new HashSet<Division>();
  29.  
  30.     public void addDivision(Division division) throws DivisionValidateException {
  31.         if (divisions.contains(division)) {
  32.              throw new DivisionValidateException("Division with divisionName = \"" + division.getDivisionName()
  33.                      + "\" already exists in the army");
  34.         }
  35.         divisions.add(division);
  36.     }
  37.  
  38. }
  39.  
  40.  
  41. class Division {
  42.     private String divisionName;
  43.  
  44.     public Division(String divisionName) {
  45.         this.divisionName = divisionName;
  46.     }
  47.  
  48.     public String getDivisionName() {
  49.         return divisionName;
  50.     }
  51.  
  52.     @Override
  53.     public boolean equals(Object o) {
  54.         if (this == o) return true;
  55.         if (o == null || getClass() != o.getClass()) return false;
  56.  
  57.         Division division = (Division) o;
  58.  
  59.         if (!divisionName.equals(division.divisionName)) return false;
  60.  
  61.         return true;
  62.     }
  63.  
  64.     @Override
  65.     public int hashCode() {
  66.         return divisionName.hashCode();
  67.     }
  68. }
  69.  
  70. class DivisionValidateException extends Exception {
  71.     public DivisionValidateException(String message) {
  72.         super(message);
  73.     }
  74. }
Success #stdin #stdout #stderr 0.1s 27848KB
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Standard input is empty
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Standard output is empty
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DivisionValidateException: Division with divisionName = "8th Infantry Division" already exists in the army
	at Army.addDivision(Main.java:32)
	at Main.main(Main.java:20)
https://ideone.com/v1eumq
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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