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[] arrayAppend(Class<T> cls, T[] arr, T... append) {
    @SuppressWarnings("unchecked")
    T[] ret = (T[]) Array.newInstance(cls, arr.length + append.length);
    for (int i = 0; i < arr.length; i++)
        ret[i] = arr[i];//from   w ww .  j a  va  2 s  .c om
    for (int i = 0; i < append.length; i++)
        ret[i + arr.length] = append[i];
    return ret;
}

From source file:Main.java

static public Object extractArray(Object[] list, int pos, int n) {
    Class type = list.getClass().getComponentType();
    Object temp = Array.newInstance(type, n);
    System.arraycopy(list, pos, temp, 0, n);
    return temp;//from   www .j a  v  a  2 s. c o m
}

From source file:Main.java

public static <T> T[] addElement(T[] array, T element) {
    Class<?> ct = array.getClass().getComponentType();
    T[] newArray = (T[]) Array.newInstance(ct, array.length + 1);
    System.arraycopy(array, 0, newArray, 0, array.length);
    newArray[newArray.length - 1] = element;
    return newArray;
}

From source file:Main.java

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

From source file:Main.java

public static <T> T[] toArray(List<T> list, Class<T> clazz) {
    @SuppressWarnings("unchecked")
    T[] result = (T[]) Array.newInstance(clazz, list.size());
    for (int i = 0; i < list.size(); i++) {
        result[i] = list.get(i);/*from  w  w w .j  av a2 s  .co  m*/
    }
    return result;
}

From source file:Main.java

public static <T> T[] convertArrayToList(Collection<T> list) {
    return (T[]) (list.size() > 0
            ? list.toArray((Object[]) Array.newInstance(list.iterator().next().getClass(), list.size()))
            : null);//w w w . jav a  2  s .  co  m
}

From source file:Main.java

public static <T> T[] resize(T[] x, int size) {
    T[] out = null;//from w  w w .  j  a va  2  s .  c  om
    try {
        out = (T[]) Array.newInstance(x.getClass().getComponentType(), size);
    } catch (Exception e) {
        e.printStackTrace();
        throw new RuntimeException(e.getMessage());
    }
    int n = Math.min(x.length, size);
    System.arraycopy(x, 0, out, 0, n);
    return out;
}

From source file:Main.java

public static <T> T[] mergeArrays(T[]... arr) {
    int size = 0;
    for (T[] ts : arr) {
        size += ts.length;//from  w  ww . j  a v a  2s.co m
    }
    T[] ret = (T[]) Array.newInstance(arr[0].getClass().getComponentType(), size);
    int off = 0;
    for (T[] ts : arr) {
        System.arraycopy(ts, 0, ret, off, ts.length);
        off += ts.length;
    }
    return ret;
}

From source file:Main.java

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

    if (array.length >= length) {
        return array;
    }//from w ww. j a v a 2s.  c  o  m

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

From source file:Main.java

@SuppressWarnings("unchecked")
public static <T> T[] collectionToArray(Collection<T> sourceCollection, Class<?> elementClass) {
    Object array = Array.newInstance(elementClass, sourceCollection.size());
    Iterator iterator = sourceCollection.iterator();
    for (int i = 0; i < sourceCollection.size(); i++) {
        Array.set(array, i, iterator.next());
    }/*from   w w w. j a va  2s  .  c  om*/
    return (T[]) array;
}