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Android Studio – A list that holds the latest 10 values

I am trying to create a list that holds up to the latest 10 values, however, these values need to be the latest. For example, I have a loop that outputs 100 numbers but only the lastest 10 numbers should be saved in this list.

Can anyone help me with this scenario as I am stuck and new to JAVA?

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2

Answers


  1. 0

    Try Guava library it has EvictingQueue

        EvictingQueue<String> queue = EvictingQueue.create(10);
    //code test
     //add 100 strings to queue 
        for(int i =0;i<100;i++){
                    queue.add ("some text " + i);
                }
  //Iterate through array and print
  for(String x: queue){
            System.out.println (x);
        }

Output: 
Some Text90
Some Text91
Some Text92
Some Text93
Some Text94
Some Text95
Some Text96
Some Text97
Some Text98
Some Text99

    It’s Android compatible, but 'com.google.common.collect.EvictingQueue' is marked unstable with @Beta :

    implementation("com.google.guava:guava:30.1.1-android")
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  2. 0

    You can simply create a List with limitation, by extending an existing List-Implementation and overriding the add-method like this:

    class LimitedList<E> extends LinkedList<E> {
  private final int maxElements;

  public LimitedList(int maxElements) {
    this.maxElements = maxElements;
  }

  @Override
  public boolean add(E e) {
    if(this.size() > maxElements - 1) {
      this.remove(0);
    }
    return super.add(e);
  }
}

    Note: in ArrayList there are also other methods to add elements, so maybe these also need to be overriden.

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