Converting array of Objects to array of custom Types

Question

I have a method to build the array for the required type. It works for the primitive types. But when I have array of custom objects it doesn't work. So I have tweaked it. But still it fails. Code is like this :

    private Object buildArray(  String type,   Object object) {
    final Class<?> requiredType =  loadClass(type);
    final String typeName = type.substring(2).replace(";", "").trim();
        Object[] array = ((Object[]) object);
        ArrayList<Object> arrayList = new ArrayList<Object>(array.length);
        for (Object customObj : array) {
            arrayList.add(castToRequiredType(typeName, customObj));
        }
        return arrayList.toArray();
 }

In this castToRequiredType : casts the CustomObject to the CustomType where CustomType is a class. And array to be build is of type CustomType. I am stuck at dynamically building the array of CustomType.

Any help in this direction is welcome. Thanks in advance.

The intention of this code is really hard to understand. What is your overall goal with this? — Björn Pollex
– Björn Pollex, Commented Jun 23, 2011 at 11:38
overall goal is to invoke the API which takes a parameter of type customObject[]. And each CustomObject I have to build using castToRequiredType. This CustomObject can be MyCustoType, YourCustomType etc. — java_enthu
– java_enthu, Commented Jun 23, 2011 at 11:47

mustaccio · Accepted Answer · 2014-06-19 13:54:04Z

2

If you have an array of Object, you can use Arrays.copyOf to convert it to a different type:

CustomType[] ca = Arrays
  .copyOf(array, array.length, CustomType[].class);

edited Jun 19, 2014 at 13:54

mustaccio

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answered Jun 23, 2011 at 11:37

Björn Pollex

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6 Comments

java_enthu Over a year ago

Well i tried replacing the last like like this return Arrays.copyOf(arrayList.toArray(), arrayList.size(), customType.newInstance()); but it doesn't compile The method copyOf(U[], int, Class<? extends T[]>) in the type Arrays is not applicable for the arguments (Object[], int, capture#40-of ?) Thanks for help :)

Björn Pollex Over a year ago

@java_enthu: There was a mistake in my answer, but I fixed it. This line replace your for-loop. You do not need to construct an ArrayList first. This works directly with your array.

java_enthu Over a year ago

@space_cowboy : I replace loop by Class<?> customType = loadClass(typeName); Arrays.copyOf(array, array.length,customType);Still i am getting the same compilation error. he method copyOf(U[], int, Class<? extends T[]>) in the type Arrays is not applicable for the arguments (Object[], int, Class<capture#40-of ?>)

Björn Pollex Over a year ago

@java_enthu: Sorry, It seems that indeed this approach does not work if class is not known at compile time.

java_enthu Over a year ago

Anyway thanks for quick help :) Any other approach or work around do you see which will be feasible?

|

java_enthu · Accepted Answer · 2011-06-23 13:24:42Z

1

Thanks I have solved it using Axis's Array Util For the same

answered Jun 23, 2011 at 13:24

java_enthu

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