for (int i = 0; i < 10; i++) {
for (int j = 0; j < 10; j++) {
for (int j2 = 0; j2 < 10; j2++) {
for (int k = 0; k < 10; k++) {
int ji = i*1000+j*100+j2*10+k;
int res = k*1000+j2*100+j*10+i;
if(ji*9==res){
System.out.println("中="+i);
System.out.println("国="+j);
System.out.println("少="+j2);
System.out.println("年="+k);
System.out.println("-------");
}
}
}
}
}