用for循环打印出下面的三角形

[wusheng0603]

A
B C D
E F G H I

[qq_33506800]

String[] arr = new String[] { "A", "B", "C", "D", "E", "F", "G", "H","I" };
int num = 0;
for (int i = 1; i <= 3; i++) {
for (int j = 3 - i; j > 0; j--) {
System.out.print(" ");
}
for (int k = 0; k < i * 2 - 1; k++) {
System.out.print(arr[num++]);
}
System.out.println();
}

[andykg]

[ZQWFD1984]

package test;

public class test2 {

	static int index=0;  
	public static void main(String[] args) {
		
		for (int i=0;i<3;i++){
			for (int j=0;j<2-i;j++){
				System.out.print(" ");
			}
			for(int k=0;k<=2*i;k++){
				System.out.print((char)('A'+index));
				index++;
			}
			System.out.println("");
		}
	}
	
}