Cut array indexs and insert array

Arraylab.java

package arraylab;
public class Arraylab {
    public static void main(String[] args) {
        
     int arr[] = new int[100];
     // add 2^i to the array where 0 <= i <= 20
     // EX: arr[1,2,4,8,16,32,64,... 2^30]
     int expo=1;
     for (int i=0; i < 100; i++) {
         arr[i] = expo;
         expo *= 2;
     }
    printArr(arr);
    System.out.println("Array size = " + arraySize(arr));
    System.out.println("Average array = " + averageArray(arr));
    insertArray(arr, (int)averageArray(arr));
    printArr(arr);
    deleteArray(arr, 128);
    printArr(arr);
 }
    public static void deleteArray(int [] a, int deleteValue){
       int i=0;
       for (i=0; a[i]< deleteValue; i++) { //a[i]
        if(a[i] == deleteValue)
       }
       int test = i;
       for (i=test ; i< arraySize(a); i++) {
            a[i] = a[i+1];
       }
    }
       
      // for (i=arraySize(a) && a[i]!=deleteValue; i++) // ถอยหลังไอ้สัส 
  
    public static void insertArray(int [] a, int value){
        int i=0;
        for (i=arraySize(a)-1; a[i]>value; i--) // ถอยหลังไอ้สัส {
        { a[i] = a[i+1] = a[i]; } 
    a[i+1] = value;
    }
    
    
    public static double averageArray(int[] a) {
    int sum =0;
      for(int i=0; i < arraySize(a) ; i++) {
        sum += a[i];
      }
    return (sum*1.0)/arraySize(a);  
    }
    
    public static void printArr(int[] a) {
        for(int i=0; i < a.length ; i++) {
         System.out.print(a[i] + " ");
    }
    System.out.println();   
    }
    
    public static int arraySize(int[] a) {
        int size=0;
        for(int i=0; a[i]>0; i++, size++);
        return size;
    }
}
//END OF CODE LINE