Returns an object array by wrapping primitive types. - Java Collection Framework

Java examples for Collection Framework:Array Element

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Description

Returns an object array by wrapping primitive types.

Demo Code


//package com.java2s;
import java.lang.reflect.Array;

public class Main {
    public static void main(String[] argv) throws Exception {
        Object sourceArray = "java2s.com";
        System.out.println(java.util.Arrays
                .toString(convertToObjectArray(sourceArray)));
    }//ww  w .  j  a  v  a2s . c om

    /**
     * Returns an object array by wrapping primitive types. If the 
     * specified array is of primitive component type, an <code>Object[]</code>
     * with the corresponding wrapper component type is returned.
     * If the specified array is already an object array, the instance is
     * returned unchanged.
     * @param sourceArray the array
     * @return the corresponding object array
     * @throws IllegalArgumentException if the specified object
     *         is not an array (either of reference or primitive
     *         component type)
     */
    public static Object[] convertToObjectArray(Object sourceArray) {
        if (!sourceArray.getClass().isArray()) {
            throw new IllegalArgumentException(
                    "sourceArray must be an array");
        }
        Class componentType = sourceArray.getClass().getComponentType();
        if (!componentType.isPrimitive()) {
            return (Object[]) sourceArray;
        }
        if (componentType.equals(Boolean.TYPE)) {
            componentType = Boolean.class;
        } else if (componentType.equals(Byte.TYPE)) {
            componentType = Byte.class;
        } else if (componentType.equals(Character.TYPE)) {
            componentType = Character.class;
        } else if (componentType.equals(Short.TYPE)) {
            componentType = Short.class;
        } else if (componentType.equals(Integer.TYPE)) {
            componentType = Integer.class;
        } else if (componentType.equals(Long.TYPE)) {
            componentType = Long.class;
        } else if (componentType.equals(Float.TYPE)) {
            componentType = Float.class;
        } else if (componentType.equals(Double.TYPE)) {
            componentType = Double.class;
        }
        int length = Array.getLength(sourceArray);
        Object[] targetArray = (Object[]) Array.newInstance(componentType,
                length);
        for (int ii = 0; ii < length; ii++) {
            targetArray[ii] = Array.get(sourceArray, ii);
        }
        return targetArray;
    }
}

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