Generate random numbers without repeating a value: Difference between revisions
Generate random numbers without repeating a value (view source)
Revision as of 21:03, 11 May 2023
, 1 year ago→{{header|Java}}
m (Remove stray formatting text from code) |
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Line 602:
=={{header|Java}}==
<syntaxhighlight lang="java">
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Random;
import java.util.Set;
</syntaxhighlight>
<syntaxhighlight lang="java">
int[] randomList() {
/* 'Set' allows only unique values */
/* 'LinkedHashSet' will preserve the input order */
Set<Integer> set = new LinkedHashSet<>();
Random random = new Random();
while (set.size() < 20)
set.add(random.nextInt(1, 21));
int[] values = new int[set.size()];
/* 'Set' does not have a 'get' method */
Iterator<Integer> iterator = set.iterator();
int index = 0;
while (iterator.hasNext())
values[index++] = iterator.next();
return values;
}
</syntaxhighlight>
<pre>
8, 3, 2, 17, 11, 4, 6, 15, 20, 9, 14, 10, 5, 19, 18, 7, 12, 13, 1, 16
</pre>
<pre>
6, 7, 20, 14, 1, 2, 10, 5, 13, 8, 4, 12, 16, 15, 17, 11, 18, 3, 19, 9
</pre>
<br />
<syntaxhighlight lang="java">import java.util.*;
Line 619 ⟶ 649:
[19, 15, 10, 6, 17, 13, 14, 9, 2, 20, 3, 18, 8, 16, 7, 12, 1, 4, 5, 11]
</pre>
=={{header|JavaScript}}==
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