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

static public Object trimArray(Object[] list, int start, int end) {
    int newSize = end - start;
    Class type = list.getClass().getComponentType();
    Object temp = Array.newInstance(type, newSize);
    System.arraycopy(list, start, temp, 0, newSize);
    return temp;//from  w ww .j a va 2  s .c o m
}

From source file:MainClass.java

static Object doubleArray(Object original) {
    Object returnValue = null;/*w  w  w. j  a v  a  2s  . co  m*/
    Class type = original.getClass();
    if (type.isArray()) {
        int length = Array.getLength(original);
        Class elementType = type.getComponentType();
        returnValue = Array.newInstance(elementType, length * 2);
        System.arraycopy(original, 0, returnValue, 0, length);
    }
    return returnValue;
}

From source file:Main.java

/**
 * Expands an array of Objects to double of its current size. Remember to use cast to turn the result into an array of the appropriate class, i.e:
 * /*from   ww w  . j  av a  2s. c o  m*/
 *   <code>someArray=(SomeClass [])unlekker.util.Util.expandArray(someArray);
 * @param list Array to be expanded.
 * @return Array of Object [], must be cast to appropriate class.
 */
static public Object expandArray(Object[] list) {
    int newSize = list.length * 2;
    Class type = list.getClass().getComponentType();
    Object temp = Array.newInstance(type, newSize);
    System.arraycopy(list, 0, temp, 0, Math.min(Array.getLength(list), newSize));
    return temp;
}

From source file:Main.java

@SuppressWarnings("unchecked")
public static <T> T[] withoutFirst(T[] o) {
    final Class<?> memberClass = o.getClass().getComponentType();
    final T[] result = (T[]) Array.newInstance(memberClass, o.length - 1);
    System.arraycopy(o, 1, result, 0, result.length);
    return result;
}

From source file:Main.java

/**
 * Removes sub-array./* w  w w .  ja  va  2s.c om*/
 */
@SuppressWarnings({ "unchecked" })
public static <T> T[] remove(T[] buffer, int offset, int length, Class<T> componentType) {
    int len2 = buffer.length - length;
    T[] temp = (T[]) Array.newInstance(componentType, len2);
    System.arraycopy(buffer, 0, temp, 0, offset);
    System.arraycopy(buffer, offset + length, temp, offset, len2 - offset);
    return temp;
}

From source file:Main.java

/**
 * Inserts one array into another at given offset.
 *//*from   w w  w  . j a  va 2s .  c o m*/
@SuppressWarnings({ "unchecked" })
public static <T> T[] insertAt(T[] dest, T[] src, int offset, Class componentType) {
    T[] temp = (T[]) Array.newInstance(componentType, dest.length + src.length - 1);
    System.arraycopy(dest, 0, temp, 0, offset);
    System.arraycopy(src, 0, temp, offset, src.length);
    System.arraycopy(dest, offset + 1, temp, src.length + offset, dest.length - offset - 1);
    return temp;
}

From source file:Main.java

public static String[] addAll(String[] array1, String[] array2) {
    if (array1 == null) {
        return clone(array2);
    } else if (array2 == null) {
        return clone(array1);
    }/*from ww  w  .j av  a  2s  .c om*/
    String[] joinedArray = (String[]) Array.newInstance(array1.getClass().getComponentType(),
            array1.length + array2.length);
    System.arraycopy(array1, 0, joinedArray, 0, array1.length);
    System.arraycopy(array2, 0, joinedArray, array1.length, array2.length);
    return joinedArray;
}

From source file:Main.java

public static <T> T[] toTypedArray(Collection<?> collection, Class<T> type) {
    @SuppressWarnings("unchecked")
    T[] array = (T[]) Array.newInstance(type, collection.size());
    Object[] data = collection.toArray();
    for (int i = 0; i < array.length; i++) {
        array[i] = type.cast(data[i]);//from   w w  w . jav  a 2  s  .c o  m
    }
    return array;

}

From source file:Main.java

public static int[] newUnpaddedIntArray(int minLen) {
    return (int[]) Array.newInstance(int.class, minLen);
}

From source file:Main.java

public static char[] newUnpaddedCharArray(int minLen) {
    return (char[]) Array.newInstance(char.class, minLen);
}