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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.util.concurrent.*;
  5. import java.util.stream.*;
  6. import java.lang.*;
  7. import java.io.*;
  8.  
  9. /* Name of the class has to be "Main" only if the class is public. */
  10. class Ideone
  11. {
  12. 	public static void main (String[] args) throws java.lang.Exception
  13. 	{
  14. 		ThreadPoolExecutor pool = new ThreadPoolExecutor(8, 8, 0, TimeUnit.SECONDS, new ArrayBlockingQueue<>(10));
  15.         //ExecutorService pool = Executors.newFixedThreadPool(2);
  16.         //ForkJoinPool pool = new ForkJoinPool(8);
  17.  
  18.         List<Record> list = new ArrayList<>();
  19.         for (int i = 0; i < 115000; i++)
  20.         {
  21.             list.add(new Record("A", i / 10000, "B", "C", i, (double) i / 100 + 1));
  22.         }
  23.         System.out.println("ArrayList's spliterator is ORDERED: " +
  24.                 ((list.spliterator().characteristics() & Spliterator.ORDERED) != 0));
  25.  
  26.         Stream<Record> stream = list.parallelStream()
  27.            //.parallel()
  28.            .sorted(
  29.                    (r1, r2) -> Integer.compare(r1.getCategory2(), r2.getCategory2())
  30.            )
  31.            //.parallel()
  32.            ;
  33.  
  34.         List<Record> output = stream.collect(Collectors.toList());
  35.  
  36.         System.out.println(output.size());
  37.         int prev = -1;
  38.         boolean verified = true;
  39.         for (Record record : output)
  40.         {
  41.             int curr = record.getValue1();
  42.             if (prev != -1)
  43.             {
  44.                 if (prev + 1 != curr)
  45.                 {
  46.                     System.out.println("Warning: " + prev + " followed by " + curr + "!");
  47.                     verified = false;
  48.                 }
  49.             }
  50.             prev = curr;
  51.         }
  52.         System.out.println("Verified: " + verified);
  53. 	}
  54. }
  55.  
  56. class Record implements Comparable<Record>
  57. {
  58.    private String myCategory1;
  59.    private int    myCategory2;
  60.    private String myCategory3;
  61.    private String myCategory4;
  62.    private int    myValue1;
  63.    private double myValue2;
  64.  
  65.    public Record(String category1, int category2, String category3, String category4,
  66.       int value1, double value2)
  67.    {
  68.       myCategory1 = category1;
  69.       myCategory2 = category2;
  70.       myCategory3 = category3;
  71.       myCategory4 = category4;
  72.       myValue1 = value1;
  73.       myValue2 = value2;
  74.    }
  75.  
  76.    public String getCategory1()
  77.    {
  78.       return myCategory1;
  79.    }
  80.  
  81.    public int getCategory2()
  82.    {
  83.       return myCategory2;
  84.    }
  85.  
  86.    public String getCategory3()
  87.    {
  88.       return myCategory3;
  89.    }
  90.  
  91.    public String getCategory4()
  92.    {
  93.       return myCategory4;
  94.    }
  95.  
  96.    public int getValue1()
  97.    {
  98.       return myValue1;
  99.    }
  100.  
  101.    public double getValue2()
  102.    {
  103.       return myValue2;
  104.    }
  105.  
  106.     public int compareTo(Record other)
  107.     {
  108.         int comp = myCategory1.compareTo(other.myCategory1);
  109.         if (comp != 0) return comp;
  110.         comp = myCategory2 - other.myCategory2;
  111.         if (comp != 0) return comp;
  112.         comp = myCategory3.compareTo(other.myCategory3);
  113.         if (comp != 0) return comp;
  114.         comp = myCategory4.compareTo(other.myCategory4);
  115.         return comp;
  116.     }
  117.  
  118.    /**
  119.     * Returns the string representation.
  120.     * @return The string representation.
  121.     */
  122.    public String toString()
  123.    {
  124.       StringBuilder buf = new StringBuilder();
  125.       buf.append("Record(");
  126.       buf.append(myCategory1);
  127.       buf.append(",");
  128.       buf.append(myCategory2);
  129.       buf.append(",");
  130.       buf.append(myCategory3);
  131.       buf.append(",");
  132.       buf.append(myCategory4);
  133.       buf.append(",");
  134.       buf.append(myValue1);
  135.       buf.append(",");
  136.       buf.append(myValue2);
  137.       buf.append(")");
  138.       return buf.toString();
  139.    }
  140. }
Success #stdin #stdout 0.29s 321728KB
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Standard input is empty
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ArrayList's spliterator is ORDERED: true
115000
Warning: 69999 followed by 71875!
Warning: 79061 followed by 70000!
Warning: 71874 followed by 79062!
Warning: 99999 followed by 100625!
Warning: 107811 followed by 100000!
Warning: 100624 followed by 107812!
Verified: false
https://ideone.com/vli0tC
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
public

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