Having trouble with comparing strings and arrays

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shdwdrgn517 shdwdrgn517 is offline Offline
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Having trouble with comparing strings and arrays

 
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  #1
Oct 27th, 2004
I'm trying to compare a string to an ArrayList Object. But no matter how I try to compare it, such as just ==, or .equals(), or .compareTo(), or String.valueOf(ArrayList.get()) with all of the above options, it won't compare correctly, even if they are equal when outputted they aren't equal when compared. I can post the whole code if you want me to, it is to have a word <= 5 characters input and rearranged every way possible but not outputting duplicates. I can get the every possible output part but I can't seem to compare the string to an ArrayList object. Thanks in advance for your help.
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Re: Having trouble with comparing strings and arrays

 
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  #2
Oct 27th, 2004
I figured I might as well post the code so i can get some other suggestions on it too...
Java Syntax (Toggle Plain Text) 
  1. import cs1.Keyboard;
  2. import java.util.ArrayList;
  3.  
  4. public class Combinations {
  5.  
  6.     public static void main(String[] args) 
  7.     {
  8.         System.out.println("Enter 5 or less characters to be rearranged:");
  9.         String str = Keyboard.readString();
  10.         int check = 0;
  11.         int not=0;
  12.         char[] ch2 = {'a','b'};
  13.         char[] ch3 = {'a','b','c'};
  14.         char[] ch4 = {'a','b','c','d'};
  15.         char[] ch5 = {'a','b','c','d','e'};
  16.         ArrayList combos = new ArrayList();
  17.         if (str.length()==1)
  18.             combos.add(str);
  19.         if (str.length()==2)
  20.         {
  21.             for(int x = 0; x<2;x++)
  22.                 for (int y = 0; y<2; y++)
  23.                 {
  24.                     if(x!=y)
  25.                     {
  26.                         ch2[0] = str.charAt(x);
  27.                         ch2[1] = str.charAt(y);
  28.                         if( combos.size()!=0)
  29.                             while (check<combos.size())
  30.                             {
  31.                                 if (String.valueOf(ch2) == String.valueOf(combos.get(check)))
  32.                                     not = 1;
  33.                                 check++;
  34.                             }
  35.                         if (not != 1)
  36.                             combos.add(String.valueOf(ch2));
  37.                         check = 0;
  38.                         not = 0;
  39.                     }
  40.                 }
  41.         }
  42.         if (str.length()==3)
  43.         {
  44.             for(int x = 0; x<3;x++)
  45.                 for(int y = 0; y<3;y++)
  46.                     for (int z = 0;z<3;z++)
  47.                     {
  48.                         if (x!=y && x!=z && y!=z)
  49.                         {
  50.                             ch3[0] = str.charAt(x);
  51.                             ch3[1] = str.charAt(y);
  52.                             ch3[2] = str.charAt(z);
  53.                             if (combos.size()!=0)
  54.                                 while(check<combos.size())
  55.                                 {
  56.                                     if (String.valueOf(ch3) == String.valueOf(combos.get(check)))
  57.                                         not = 1;
  58.                                     check++;
  59.                                 }
  60.                             if(not!=1)
  61.                                 combos.add(String.valueOf(ch3));
  62.                             check =0;
  63.                             not = 0;
  64.                         }
  65.                     }
  66.         }
  67.         if (str.length()==4)
  68.         {
  69.             for(int x = 0; x<4;x++)
  70.                 for(int y = 0; y<4;y++)
  71.                     for (int z = 0;z<4;z++)
  72.                         for (int a = 0; a<4;a++)
  73.                             if (x!=y && x!=z && x!=a && y!=z && y!=a && z!=a)
  74.                             {
  75.                                 ch4[0] = str.charAt(x);
  76.                                 ch4[1] = str.charAt(y);
  77.                                 ch4[2] = str.charAt(z);
  78.                                 ch4[3] = str.charAt(a);
  79.                                 if (combos.size()!=0)
  80.                                     while(check<combos.size())
  81.                                     {
  82.                                         if (String.valueOf(ch4) == String.valueOf(combos.get(check)))
  83.                                             not = 1;
  84.                                         check++;
  85.                                     }
  86.                             if(not!=1)
  87.                                 combos.add(String.valueOf(ch4));
  88.                             check =0;
  89.                             not = 0;
  90.                             }
  91.         }
  92.         if (str.length()==5)
  93.         {
  94.             for(int x = 0; x<5;x++)
  95.                 for(int y = 0; y<5;y++)
  96.                     for (int z = 0;z<5;z++)
  97.                         for (int a = 0; a<5;a++)
  98.                             for (int b = 0; b<5; b++)
  99.                                 if (x!=y && x!=z && x!=a && x!=b && y!=z && y!=a && y!=b && z!=a && z!=b && a!=b)
  100.                                 {
  101.                                     ch5[0] = str.charAt(x);
  102.                                     ch5[1] = str.charAt(y);
  103.                                     ch5[2] = str.charAt(z);
  104.                                     ch5[3] = str.charAt(a);
  105.                                     ch5[4] = str.charAt(b);
  106.                                     if (combos.size()!=0)
  107.                                     while(check<combos.size())
  108.                                     {
  109.                                         if (String.valueOf(ch5) == String.valueOf(combos.get(check)))
  110.                                             not = 1;
  111.                                         check++;
  112.                                     }
  113.                                     if(not!=1)
  114.                                         combos.add(String.valueOf(ch5));
  115.                                     check =0;
  116.                                     not = 0;
  117.                                 }
  118.         }
  119.         for (int x = 0; x<combos.size(); x++)
  120.             System.out.println(combos.get(x));
  121.         System.out.println("Number of combinations:" + combos.size());
  122.     }
  123.  
  124. }
Thanks again
Last edited by shdwdrgn517; Oct 27th, 2004 at 8:21 pm. Reason: Line of code not needed
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Re: Having trouble with comparing strings and arrays

 
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  #3
Oct 27th, 2004
>I'm trying to compare a string to an ArrayList Object.
This is your problem. Unless you can figure out a way to convert the ArrayList to a String so that they are comparable, you'll need to manually compare each item individually in a loop.
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Re: Having trouble with comparing strings and arrays

 
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  #4
Oct 27th, 2004
ArrayLists have a .toString method but it calls the String.valueOf() method to translate and I've tried the .valueOf() so I figured the toString wouldn't work any better.
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Re: Having trouble with comparing strings and arrays

 
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  #5
Oct 27th, 2004
Nvm, I apparently didn't try .equals(), thought I did. Thanks anyway to those who tried to help
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