java 金字塔

package Calc;

public class jinzita {

public static void main(String[] args) {
// TODO Auto-generated method stub
String st = " ";
for( int i = 0; i < 8; i++){

for (int js = 0; js < (7-i); js++) {
System.out.printf("%4s",st);
}

for (int jn = 0; jn < i+1; jn++) {
double j = Math.pow(2, jn);
System.out.printf("%4.0f",j);

}

for (int jn2 = i-1; jn2 >=0; jn2--) {
double j = Math.pow(2, jn2);
System.out.printf("%4.0f",j);

}

System.out.println("");
}