素_元_组_数_除_删_加_增

private static void delIndexElement(int a, int b) {
int[] index_A = new int[]{1,6,3,2,9,4,5,7,8};
int index = index_A.length;

if(a >= index || a < 0){
System.out.println("No");
return;
}

int[] index_B = new int[index+1];

for (int i = 0; i < index+1; i++) {
if(i < a){
index_B[i] = index_A[i];
}else if(i == a){
index_B[i] = b;
}else if(i > a){
index_B[i] = index_A[i-1];
}
}

for (int i = 0; i < index_B.length; i++) {
if(i != index_B.length - 1){
System.out.print(index_B[i]+",");
}else{
System.out.println(index_B[i]);
}
}
}

private static void addIndexElement(int a) {
int[] index_A = new int[]{1,3,2,6,9,7,5,4,8};
int index = index_A.length;

if(a >= index || a < 0){
System.out.println("NO");
return;
}

int[] index_B = new int[index-1];
System.arraycopy(index_A, 0, index_B, 0, index_B.length);
int t = 0;

for (int i = 0; i < index; i++) {
if(i != a){
index_B[t++] = index_A[i];
}
}

for (int i = 0; i < index_B.length; i++) {
if(i != index_B.length - 1){
System.out.print(index_B[i]+",");
}else{
System.out.println(index_B[i]);
}
}
}