Arrays in Java are of fixed size that is specified when they are declared. To increase the size of the array you have to create a new array with a larger size and copy all of the old values into the new array.

ex:

//declare an array at first

Object[] myStore= new Object[10];

//now if I almost use up all spaces of myStore, I can create a new one with double length

myStore = Arrays.copyOf(myStore, myStore.length*2);

//the original one will be garbage collected by jvm

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