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I found this code on SO to map strings to ints
Arrays.stream(myarray).mapToInt(Integer::parseInt).toArray();
But how do I make it map to Integer type not the primitive int?
I tried switching from Integer.parseInt to Integer.valueOf, but it seems that the mapToInt() method forces the primitive type.
I have an ArrayList of arrays of Integers, so I cannot use primitive ints.
307
The string. split() method is used to split the string into various sub-strings. Then, those sub-strings are converted to an integer using the Integer. parseInt() method and store that value integer value to the Integer array.
In a HashMap, keys and values can be added using the HashMap. put() method. We can also convert two arrays containing keys and values into a HashMap with respective keys and values.
Since String and Integer are both reference types you can simply call Stream::map to transform your array.
Integer[] boxed = Stream.of(myarray).map(Integer::valueOf).toArray(Integer[]::new);
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