java - I have to write my own trimtoSize() method that creates a new array -

i've been give prewritten program exception of few methods, 1 of being trimtosize(). know exists have write own. have make there empty space within array have create new array using same values, , make size exact. i've been able compare sizes using size() , data.length i'm not sure how create new array used since function doesn't return anything(it's void).

here's have far.

public void trimtosize(){  array<integer> temp = new array<integer>();  if(size() < data.length){     int max = size();     for(int i=0; i<size();i++){         temp.add(data[i]);     } }} 

as said before don't know how return temp, , keep same max capacity same before because created using constructor. there way change capacity without changing constructor?

i can't bee sure without seeing rest of code, itappears part of class , in class integer array named data... if assumtion true, should work..

public void trimtosize() {     int size = 0;     for(int = 0; < this.data.length; i++) {         if(this.data[i] != null) {             size++;         }     }     interger[] temp = new interger[size];     for(int = 0, j = 0; < this.data.length; i++) {         if(this.data[i] != null) {             temp[j] = this.data[i];             j++;         }     }     this.data = temp; }