Create infinite array of arrays in java

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I wanted to create an array of dynamic types as in javascript. I wanted to convert below code of javascript into java.

const a = [1, [2, 3, [4, 5,[6, 7]....]]]

The above array will have nested array for every 2 elements and depth can be infinite. It is dynamic.

Is there a way to create such array in java? As I found we need to declare before hand the nested arrays as below

List<List<Integer>>

But in above code, I can only use 2 nested list with integers that too I can't use combination of integers and List inside 1st list. If I want to add another list inside second list I need to declare as

List<List<List<Integer>>>

So I need a way to solve this problem

java
1 Answers

Is there a way to create such array in java?

Yes and no. Java is a strongly typed language. With that said, every object in Java inherits from the built-in class Object. So you could do something like

Object[] array = new Object[]{1, new Object[]{2, new Object[]{3, /* ... */}}};

Although, using such a construct would be a real pain. You'll need to type-cast values before you can use them as their sourced type again.

Integer a = (Integer) array[0];
Object[] b = (Object[]) array[1];

You can achieve dynamic sizing using List<Object>.

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