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  1. import java.util.*;
  2. import java.util.Random;
  3.  
  4. class ArraySorting {
  5. public static void main(String[]args) {
  6.  
  7.     ArrayList<Integer> arr = new ArrayList<Integer>();
  8.  
  9.     Random generate = new Random();
  10.     for (int nums = 0; nums < 20; nums++) {
  11.       int randomnumbers = generate.nextInt(50);
  12.       arr.add(randomnumbers);
  13.     }
  14.  
  15.     System.out.println("First list of 20 generated numbers: ");
  16.     System.out.println(arr);
  17.     System.out.println("");
  18.  
  19.     int dupe = 0; 
  20.  
  21.     for (int n = 0; n < arr.size(); n++) {
  22.         Integer check1 = arr.get(n); 
  23.  
  24.         for (int n2 = n+1; n2 < arr.size(); n2++) { 
  25.             Integer check2 = arr.get(n2); 
  26.  
  27.             //remove second num if two numbers akike
  28.             if (check1.equals(check2)) {
  29.                 arr.remove(check2);
  30.                 n2 = n2-1;
  31.                 dupe = 1; 
  32.  
  33.             }
  34.         }
  35.         n = n-dupe;
  36.         dupe = 0;
  37.     }
  38.  
  39.     System.out.println("Duplicates: " + (20 - arr.size()));
  40.  
  41.     for (int n3 = arr.size(); n3 < 20; ++n3) {
  42.         int randomnumbers = generate.nextInt(50);
  43.         arr.add(randomnumbers);
  44.  
  45.         //check for duplicates again
  46.         for (int n = 0; n < arr.size(); n++) {
  47.             Integer check1 = arr.get(n); 
  48.  
  49.             for (int n2 = n+1; n2 < arr.size(); n2++) { 
  50.                 Integer check2 = arr.get(n2); 
  51.  
  52.                 if (check1.equals(check2)) {
  53.                     arr.remove(check2);
  54.                     n2 = n2-1;
  55.                     dupe = 1; 
  56.                 }
  57.             }
  58.             n = n - dupe;
  59.             dupe = 0;
  60.         }
  61.     }
  62.  
  63.     //before sort
  64.     System.out.println(arr);
  65.     System.out.println("");
  66.  
  67.     for(int a=0; a<20; a++){
  68.         for (int b = 0; b < 19; b++) {
  69.             if(arr.set(b,arr.get(b)) > arr.set(b,arr.get(b+1))) {
  70.                 int temporary = arr.set(b,arr.get(b));
  71.                 arr.set(b,arr.get(b)) = arr.set(b,arr.get(b+1));
  72.                 arr.set(b,arr.get(b+1)) = temporary;
  73.             }
  74.         }
  75.     }
  76.  
  77.     System.out.println("\nSorted Array:\n");
  78.     for (int a = 0; a < 20; a++) {
  79.         System.out.println("Array [" + a + "]: " + arr.set(b,arr.get(b)));
  80.     }
  81.  
  82.  
  83. }
  84.  
  85. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
Main.java:71: error: unexpected type
                arr.set(b,arr.get(b)) = arr.set(b,arr.get(b+1));
                       ^
  required: variable
  found:    value
Main.java:72: error: unexpected type
                arr.set(b,arr.get(b+1)) = temporary;
                       ^
  required: variable
  found:    value
Main.java:79: error: cannot find symbol
        System.out.println("Array [" + a + "]: " + arr.set(b,arr.get(b)));
                                                           ^
  symbol:   variable b
  location: class ArraySorting
Main.java:79: error: cannot find symbol
        System.out.println("Array [" + a + "]: " + arr.set(b,arr.get(b)));
                                                                     ^
  symbol:   variable b
  location: class ArraySorting
4 errors
stdout
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Standard output is empty
https://ideone.com/fEznSZ
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
secret

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