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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. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		String [] colors = new String[6];
  13.         colors[0] = "red";
  14.         colors[1] = "green";
  15.         colors[2] = "blue";
  16.         colors[3] = "yellow";
  17.         colors[4] = "purple";
  18.         colors[5] = "orange";
  19.  
  20. 		Set<String> randomStrings = new HashSet<String>();
  21. 		Random random = new Random();
  22. 		while( randomStrings.size() < 4) {
  23. 		    int index = random.nextInt( colors.length);
  24. 		    randomStrings.add( colors[index]);
  25. 		}
  26. 		System.out.println( "Random colors: " + randomStrings);
  27. 	}
  28. }
Success #stdin #stdout 0.07s 380224KB
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stdin
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Standard input is empty
stdout
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Random colors: [orange, red, purple, blue]
https://ideone.com/xjndNx
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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