com.google.gson.JsonArray
has add method which will append the element. If I would like to add at specific index, how to do that?
I tried with this kind of code to add element at 0th index. I am looking for something better without instantiating a new JsonArray
.
JsonArray newArray = new JsonArray();
newArray.add(new JsonPrimitive(3));
for (int i = 0; i < myArray.size(); i++) {
newArray.add(myArray.get(i));
}
Since there is no insert method for JsonArray, it means you have to make your own. It inserts a single item in the array at the point of your choosing.
public static JsonArray insert(int index, JsonElement val, JsonArray currentArray) {
JsonArray newArray = new JsonArray();
for (int i = 0; i < index; i++) {
newArray.add(currentArray.get(i));
}
newArray.add(val);
for (int i = index; i < currentArray.size(); i++) {
newArray.add(currentArray.get(i));
}
return newArray;
}
So using this method, to insert a new item 0 into an existing array [1, 2, 3] at position 0:
insert(0, new JsonPrimitive(0), myArray);
Without altering the original array, the method will return a new array [0, 1, 2, 3]. Hope that helps!
I think you are looking for something like this, you can replace an existing JsonElement at a particular index using the method mentioned below.
JsonElement set(int index, JsonElement element) Replaces the element at the specified position in this array with the specified element.
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