import java.util.ArrayList;
import java.util.List;

public class CombinationGenerator {
    public static void main(String[] args) {
        String[] elements = {"a", "b", "c", "d"};
        List<List<String>> combinations = new ArrayList<>();
        generateCombinations(elements, combinations, 0, new ArrayList<>());
        for (List<String> combination : combinations) {
            System.out.println(combination);
        }
    }

    private static void generateCombinations(String[] elements, List<List<String>> result, int start, List<String> current) {
        if (current.size() == elements.length) {
            result.add(new ArrayList<>(current));
            return;
        }
        for (int i = start; i < elements.length; i++) {
            current.add(elements[i]);
            generateCombinations(elements, result, i + 1, current);
            current.remove(current.size() - 1);
        }
    }
}
【 在 iStudy 的大作中提到: 】
: a,b,c,d四个对象
: 我要生成a,b,c,d的全组合===C(4,1)+C(4,2)+C(4,3)+C(4,4)
: 结果就是输出 {a,b,c,d, ab,ac,ad,bc,bd,cd,abc,abd,acd,bcd,abcd}
: ...................
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FROM 183.14.132.*