How can I delete an elment with it's index from one dimensional array in java? [duplicate]

Question

I have an array with a size of 5, I want to delete an element from the same array which should reduce it's size by one as well, I can make it by creating a new array but I am trying to execute on the same array. Is there is any way to get make it?

public static void main(String[] args) {
    // TODO Auto-generated method stub
int arraysize = 5;
int[] a = new int[arraysize] ;
    a[0]=1;
    a[1]=2;
    a[2]=3;
    a[3]=4;
    a[4]=5;

    for(int i=0 ; i < a.length ; i++)
    {
        if(a[i]==3)
        {
            a[i]=a[i+1];
            i = i + 1;  
        }
        System.out.println(a[i]);
    }
    a[arraysize] = a[arraysize-1] ;



}

by the way, that TODO seems pretty meaningless. may want to remove it — Azrael
– Azrael, Commented Feb 26, 2019 at 19:42

Oleg Cherednik · Accepted Answer · 2019-02-26 19:49:36Z

3

In java you cannot delete element from array and reduce it's size. Size of array is CONSTANT. Do use ArrayList instead.

This is demo snippet

int arraysize = 5;
List<Integer> numbers = new ArrayList<>(arraysize);

for (int i = 1; i <= 5; i++)
    numbers.add(i);

System.out.println(numbers.size()); // 5
System.out.println(Arrays.asList(numbers.toArray()));   // [1, 2, 3, 4, 5]

numbers.remove(3);
System.out.println(numbers.size()); // 4
System.out.println(Arrays.asList(numbers.toArray()));   //  [1, 2, 3, 5]

edited Feb 26, 2019 at 19:49

answered Feb 26, 2019 at 19:42

Oleg Cherednik

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Comments

nissim abehcera · Accepted Answer · 2019-02-26 19:43:57Z

0

It's impossible to reduce array length. You have to use another data structure

answered Feb 26, 2019 at 19:43

nissim abehcera

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