public static void main(String[] args) {
String[] demo = {"1", "2", "3", "4", "5", "6", "7", "8", "9"};
for (int i = 0; i < demo.length; i++) {
for (int j = i+1; j < demo.length; j++) {
System.out.println(demo[i]+demo[j]);
}
}
}
顺颂时祺