java排列组合算法相关问题

Question

现有：
AB
C
DE
F
如获得ACDF ACEF BCDE BCEF的 java算法

Answer 1

public class TestMain {
private static int size;
public static void main(String args[]) throws Exception {
    char [][] data = new char[][]{
            {'A', 'B'},
            {'C'},
            {'D', 'E'},
            {'F'}
    };
    int length = 1;
    for (int i=0; i<data.length; i++) {
        length *= data[i].length;
    }
    String[] result = new String[length];
    setString(data, 0, "", result);
    for (int i=0; i<length; i++) {
        System.out.println(result[i]);
    }
}

private static void setString(char[][] data, int curIndex, String string, String[] result) {
    if (data.length == curIndex) {
        result[size++] = string;
    } else {
        for (int j=0; j<data[curIndex].length; j++) {
            setString(data, curIndex+1, string + data[curIndex][j], result);
        }
    }
}

}