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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. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10.     static boolean containsOnlyNegatives(int[] integers) {
  11.       // same as answer already given, but short-circuiting and bitwise
  12.       return integers != null
  13.              && !Arrays.stream(integers).anyMatch(i -> Integer.signum(-1 & i) != -1);
  14.     }
  15.  
  16.     static boolean containsPositive(int[] integers) {
  17.       // no short-circuiting if the first element was tested positive 
  18.       return integers != null 
  19.              && Arrays.stream(integers).anyMatch(i -> Integer.signum(-1 & i) == 1);
  20.     }
  21.  
  22.  
  23. 	public static void main (String[] args) throws java.lang.Exception
  24. 	{
  25. 		final int[] mixed = {-1, -2, 3, 0};
  26. 		final int[] negatives = {-1, -2};
  27. 		final int[] positives = {3, 4};
  28. 		var testCases = Map.of(
  29. 			"mixed", mixed
  30. 			, "only negatives", negatives
  31. 			, "only positives", positives
  32. 			);
  33.  
  34.         testCases.forEach((k, v) -> 
  35.           System.out.println("Case: " + k
  36.           + " | containsOnlyNegatives: " + containsOnlyNegatives(v)
  37.           + " | containsPositive: " + containsPositive(v))
  38.           );
  39. 	}
  40. }
Success #stdin #stdout 0.2s 38268KB
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Standard input is empty
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Case: only positives | containsOnlyNegatives: false | containsPositive: true
Case: only negatives | containsOnlyNegatives: true | containsPositive: false
Case: mixed | containsOnlyNegatives: false | containsPositive: true
https://ideone.com/0gNMvE
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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