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

@SuppressWarnings("unchecked")
public static final <T, U> T[] copyOf(U[] original, int newLength, Class<? extends T[]> newType) {
    T[] copy = ((Object) newType == (Object) Object[].class) ? (T[]) new Object[newLength]
            : (T[]) Array.newInstance(newType.getComponentType(), newLength);
    System.arraycopy(original, 0, copy, 0, Math.min(original.length, newLength));
    return copy;// w  ww . j av a2  s.c  o m
}

From source file:ArrayUtil.java

/**
 * Add array./* w  w w .  j a v  a  2s  .c  o  m*/
 * 
 * @param <T>
 * @param from
 * @param to
 * @return
 */
@SuppressWarnings("unchecked")
public static <T> T[] addAll(T[] from, T[] to) {

    T[] newone = (T[]) Array.newInstance(from.getClass().getComponentType(), from.length + to.length);
    copyAll(from, newone);
    copy(to, newone, 0, from.length, to.length);
    return newone;
}

From source file:Main.java

/**
 * Converts Collection to array. /* w w  w.jav a 2  s  .c o  m*/
 * @param <T>
 * @param col
 * @param cls
 * @return 
 * @see java.util.Collection#toArray(T[]) 
 */
public static <T> T[] toArray(Collection<T> col, Class<T> cls) {
    T[] arr = (T[]) Array.newInstance(cls, col.size());
    return col.toArray(arr);
}

From source file:Main.java

@SuppressWarnings("unchecked")
public static <E extends Object> E[] toArray(Set<E> set, Class<E> clazz) {
    return set.toArray((E[]) Array.newInstance(clazz, set.size()));
}

From source file:Main.java

/**
 * Converts a typed {@link Collection} to a typed array.
 * /*from  w  ww  .  j  a va2s .  com*/
 * @param type
 *            the type class
 * @param collection
 *            the collection to convert to an array.
 * @return the array.
 */
@SuppressWarnings("unchecked")
public static <T> T[] toArray(Class<T> type, Collection<T> collection) {
    return collection.toArray((T[]) Array.newInstance(type, collection.size()));
}

From source file:Main.java

@SuppressWarnings("unchecked")
public static <T> T[] toArray(List<?> list, Class<T> type) {
    T[] array = (T[]) Array.newInstance(type, list.size());
    return list.toArray(array);
}

From source file:ArrayUtil.java

/**
 * Add new value to exsisting array.The new value is indexed to the last.
 * /*from w  w w . ja  v  a  2 s . c o m*/
 * @param <T>
 * @param current
 * @param value
 * @return
 */
@SuppressWarnings("unchecked")
public static <T> T[] add(T[] current, T value) {
    T[] newone = (T[]) Array.newInstance(current.getClass().getComponentType(), current.length + 1);
    copyAll(current, newone);
    newone[current.length] = value;
    return newone;
}

From source file:Main.java

@SuppressWarnings("unchecked")
public static <T> T[] grow(T[] array, int length, T fillElement) {
    Class<T> componentType = (Class<T>) array.getClass().getComponentType();
    T[] newArray = (T[]) Array.newInstance(componentType, length);
    System.arraycopy(array, 0, newArray, 0, array.length);
    Arrays.fill(newArray, array.length, newArray.length, fillElement);
    return newArray;
}

From source file:ArrayUtil.java

/**
 * Add new value, which sets as the first value, to existing array.
 * /*ww w  . java 2 s.co  m*/
 * @param <T>
 * @param current
 * @param value
 * @return
 */
@SuppressWarnings("unchecked")
public static <T> T[] addFirst(T[] current, T value) {

    T[] newone = (T[]) Array.newInstance(current.getClass().getComponentType(), current.length + 1);
    copy(current, newone, 0, 1, current.length);
    newone[0] = value;
    return newone;
}

From source file:Main.java

public static Object arrayExpandAddSingle(Object array, Object elementsToAdd) {
    Class cl = array.getClass();/*from  www  .  j  a  v  a2  s . c  om*/
    if (!cl.isArray())
        return null;
    int length = Array.getLength(array);
    int newLength = length + 1;
    Class componentType = array.getClass().getComponentType();
    Object newArray = Array.newInstance(componentType, newLength);
    System.arraycopy(array, 0, newArray, 0, length);
    Array.set(newArray, length, elementsToAdd);
    return newArray;
}