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  1. import java.util.Random;
  2.  
  3. interface Sum {
  4.     long sum(int[] buf);
  5. }
  6.  
  7. class RangeSum implements Sum {
  8.     @Override
  9.     public long sum(final int[] buf) {
  10.         long sum = 0L;
  11.         for (int v: buf) {
  12.             sum += v;
  13.         }
  14.         return sum;
  15.     }
  16. }
  17.  
  18. class IterSum implements Sum {
  19.     @Override
  20.     public long sum(final int[] buf) {
  21.         long sum = 0L;
  22.         for (int i = 0; i < buf.length; ++i) {
  23.             sum += buf[i];
  24.         }
  25.         return sum;
  26.     }
  27. }
  28.  
  29. class BackIterSum implements Sum {
  30.     @Override
  31.     public long sum(final int[] buf) {
  32.         long sum = 0L;
  33.         for (int i = buf.length; i-- > 0;) {
  34.             sum += buf[i];
  35.         }
  36.         return sum;
  37.     }
  38. }
  39.  
  40. public class Main {
  41.     public static void main(final String[] args) {
  42.         Compiler.compileClass(Main.class);
  43.         Compiler.compileClass(RangeSum.class);
  44.         Compiler.compileClass(IterSum.class);
  45.         Compiler.compileClass(BackIterSum.class);
  46.         int size = Integer.parseInt(args[0]);
  47.         int[] buf = new int[size];
  48.         Random random = new Random(0L);
  49.         for (int i = 0; i < size; ++i) {
  50.             buf[i] = random.nextInt();
  51.         }
  52.         Sum sum;
  53.         switch (Integer.parseInt(args[1])) {
  54.             case 0:
  55.                 sum = new RangeSum();
  56.                 break;
  57.             case 1:
  58.                 sum = new IterSum();
  59.                 break;
  60.             case 2:
  61.                 sum = new BackIterSum();
  62.                 break;
  63.             default:
  64.                 throw new RuntimeException();
  65.         }
  66.         long start = System.currentTimeMillis();
  67.         long total = sum.sum(buf);
  68.         long end = System.currentTimeMillis();
  69.         System.out.println(total + ": " + (end - start));
  70.     }
  71. }
Runtime error #stdin #stdout #stderr 0.07s 380224KB
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Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
	at Main.main(Main.java:46)
https://ideone.com/UtpVej
language:
Java (12.0.1)
created:
10 years ago
visibility:
public

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