打印三角形、已三角形方式 输出数组中的内容

public class Test_San {


public static void main(String[] args) {
Print_a(9);
char[] arr = {'A','B','C','D','E','F','G'};
Print_b(arr);
}

public static void Print_a(int x){//打印三角形
for (int i = 0; i < x; i++) {
for (int j = i; j < x; j++) {
//System.out.print("-");
}
for (int j = i; j < (i*2+1)+i; j++) {
System.out.print("*");
}
System.out.println();
}
}


public static void Print_b(char[] arr){
for(int i=0;i<=arr.length-1;i++ ){//这里要-1不然会出错
for(int j=i;j<arr.length;j++){
//System.out.print("-");
}
for(int j=i;j <(i*2+1)+i;j++){
System.out.print(arr[i]);//System.out.print(arr[i]);
}
System.out.println();
}
}

}