public class Test {    public static void main(String[] args) {        String[][] dataArray = {
    {"zhong","chong"},{"qing"},{"hai","huan"},{"ri"}};        combine(dataArray, 4);    }    public static void combine(String[][] data, int n){        if (n > data.length) {n = data.length;}        int[] idx = new int[data.length];        for (int i=0; i
    
     
      
        list = new ArrayList<>();        while (idx[0] < 2) {            int cnt=0, dig=0;            int[] gp = new int[n];            for (int i=0; i
       
        
         
          < data[gp[0]].length) {                    StringBuilder sb = new StringBuilder();                    for (int i=0; i
          
           0; i--) {                        if (subIdx[i] == data[gp[i]].length) {                            subIdx[i] = 0;                            subIdx[i-1]++;                        } else {                            break;                        }                    }                }            }            if (dig == n) {break;}            idx[data.length-1]++;            for (int i=data.length-1; i>0; i--) {                if (idx[i] == 2) {                    idx[i] = 0;                    idx[i-1]++;                } else {                    break;                }            }        }        int count = 0;        for (String s : list) {            System.out.printf("%s", s);            System.out.println();            count++;            if (count%10 == 0) {System.out.println();}        }        System.out.printf("\ncount=%d\n", count);    }}
          
         
        
       
      
     
    

运行结果：

zhongqinghairi

zhongqinghuanri

chongqinghairi

chongqinghuanri

count=4