| Код |
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class Combinations {
public static final int COMBINATION_COUNT = 4;
public static void main(String[] args) throws IOException {
String[] tokens = {"a", "b", "c", "d", "e", "f", "g"};
System.out.println("Tokens: " + Arrays.toString(tokens));
System.out.println("Combinations:");
for (String token : getCombinations(tokens, 0, COMBINATION_COUNT)) {
System.out.println(" " + token);
}
}
private static String[] getCombinations(final String[] tokens, final int from, final int combinationCount) {
if (combinationCount == 1) {
return Arrays.copyOfRange(tokens, from, tokens.length);
} else {
List<String> combinations = new ArrayList<String>();
for (int i = from; i < tokens.length; i++) {
String token = tokens[i];
String[] subCombinations = getCombinations(tokens, i, combinationCount - 1);
for (String subCombination : subCombinations) {
combinations.add(token + subCombination);
}
}
return combinations.toArray(new String[combinations.size()]);
}
}
}
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Спасибки))))