Example usage for java.lang.reflect Array newInstance

Introduction

In this page you can find the example usage for java.lang.reflect Array newInstance.

Prototype

public static Object newInstance(Class<?> componentType, int... dimensions)
        throws IllegalArgumentException, NegativeArraySizeException

Source Link

Document

Creates a new array with the specified component type and dimensions.

Usage

From source file:Main.java

public static <T> T[] ensureExactLength(T[] array, int length) {

    if (array.length == length) {
        return array;
    }/*  ww w.java  2  s.  c o m*/

    T[] newArray = (T[]) Array.newInstance(array.getClass().getComponentType(), length);
    if (array.length > 0) {
        System.arraycopy(array, 0, newArray, 0, length);
    }

    return newArray;
}

From source file:Main.java

/**
 * Returns a duplicates of an array./*from ww  w . j a v  a  2  s . com*/
 */
public static Object duplicateArray(Object source) {

    int size = Array.getLength(source);
    Object newarray = Array.newInstance(source.getClass().getComponentType(), size);

    System.arraycopy(source, 0, newarray, 0, size);

    return newarray;
}

From source file:Main.java

public static Object[] invert(Object[] array, Class aType) {
    int length = array.length;
    Object[] invertedArray = (Object[]) Array.newInstance(aType, length);

    for (int i = 0; i < invertedArray.length; i++)
        invertedArray[i] = array[length - i - 1];

    return invertedArray;
}

From source file:Main.java

public static <T> T[] list2Array(List<T> list, Class<T> clazz) {
    if (list != null) {
        @SuppressWarnings("unchecked")
        T[] array = (T[]) Array.newInstance(clazz, list.size());
        for (int i = 0; i < list.size(); i++) {
            array[i] = list.get(i);/*from   w ww .  j  av  a2 s .  c o  m*/
        }
        return array;
    }
    return null;
}

From source file:Main.java

public static Object[][] toMatrix(Iterator[] iterators, Class eachElementType) {
    Object[][] matrix = (Object[][]) Array.newInstance(eachElementType, new int[] { iterators.length, 0 });
    for (int i = 0; i < iterators.length; i++)
        matrix[i] = toArray(iterators[i], eachElementType);

    return matrix;
}

From source file:Main.java

@SuppressWarnings("unchecked")
public static <T> T[] listToArray(List<T> list) {
    if (list == null) {
        return null;
    }/*  ww w .  j  a va 2  s . co m*/

    T[] tArr = (T[]) Array.newInstance(list.get(0).getClass(), list.size());
    return list.toArray(tArr);
}

From source file:Main.java

@SuppressWarnings("unchecked")
public static <T> T[] addToArray(T[] array1, T[] array2) {

    Class<?> componentType = array1.getClass().getComponentType();

    final Object newArray = Array.newInstance(componentType, array1.length + array2.length);

    System.arraycopy(array1, 0, newArray, 0, array1.length);
    System.arraycopy(array2, 0, newArray, array1.length, array2.length);

    return (T[]) newArray;
}

From source file:Main.java

public static <T> T[] concatenate(T[] a, T[] b) {
    int aLen = a.length;
    int bLen = b.length;

    @SuppressWarnings("unchecked")
    T[] c = (T[]) Array.newInstance(a.getClass().getComponentType(), aLen + bLen);
    System.arraycopy(a, 0, c, 0, aLen);
    System.arraycopy(b, 0, c, aLen, bLen);

    return c;//from   w  w  w . j av  a 2 s .c  o  m
}

From source file:Main.java

@SuppressWarnings("unchecked")
public static <T> T[] toArray(Collection<T> c) {
    if (c == null) {
        return null;
    } else {// ww w .  j av  a2 s .  c  om
        T[] result = (T[]) Array.newInstance(c.getClass().getComponentType(), c.size());
        int i = 0;
        for (T r : c) {
            result[i] = r;
            i++;
        }
        return result;
    }
}

From source file:Main.java

public static Object newArray(Class<?> claxx, int size) {
    return Array.newInstance(claxx, size);
}