打印三角形

public class testdemo {
public static void main(String[] args) {
//打印三角形 五行
for (int i = 1; i <= 5; i++) {
for (int j = 5; j >=i ; j--) {
System.out.print(" ");
}
for (int j = 1; j <=i ; j++) {

System.out.print("");
}
for (int j = 1; j <i ; j++) {
System.out.print("");
}
System.out.println();

}
}
}