Example usage for java.lang System arraycopy

Introduction

In this page you can find the example usage for java.lang System arraycopy.

Prototype

@HotSpotIntrinsicCandidate
public static native void arraycopy(Object src, int srcPos, Object dest, int destPos, int length);

Source Link

Document

Copies an array from the specified source array, beginning at the specified position, to the specified position of the destination array.

Usage

From source file:Main.java

public static char[] copyOf(char[] data, int newLength) {
    char[] tmp = new char[newLength];

    if (newLength < data.length) {
        System.arraycopy(data, 0, tmp, 0, newLength);
    } else {//from w w  w. j  av  a2s.c o m
        System.arraycopy(data, 0, tmp, 0, data.length);
    }

    return tmp;
}

From source file:Main.java

public static ParcelUuid[] toParcelUUids(Parcelable[] uuids) {
    if (uuids == null) {
        return null;
    }//from  w  ww  .  j  av  a2s.c om
    ParcelUuid[] uuids2 = new ParcelUuid[uuids.length];
    System.arraycopy(uuids, 0, uuids2, 0, uuids.length);
    return uuids2;
}

From source file:Main.java

public static boolean[] createCopy(boolean[] array, int dataSize, int newLength) {
    boolean[] newArray = new boolean[newLength];
    if (dataSize > 0) {
        System.arraycopy(array, 0, newArray, 0, dataSize);
    }//w  w w.  j  a  v a 2 s. c o m
    return newArray;
}

From source file:Main.java

@SuppressWarnings("unchecked")
public static <T> T[] join(T[] head, T[] tail) {
    if (head == null) {
        return tail;
    }/* w ww  .  j a v  a  2s . c o m*/
    if (tail == null) {
        return head;
    }
    Class<?> type = head.getClass().getComponentType();
    T[] result = (T[]) Array.newInstance(type, head.length + tail.length);

    System.arraycopy(head, 0, result, 0, head.length);
    System.arraycopy(tail, 0, result, head.length, tail.length);

    return result;
}

From source file:Util.java

/**
 * Returns a new array that is the concatenation of a1 and a2.
 * //w  w  w.j a v a 2s .c o  m
 * @param a1
 * @param a2
 * @return
 */
public static int[] append(int[] a1, int[] a2) {
    int[] ret = new int[a1.length + a2.length];
    System.arraycopy(a1, 0, ret, 0, a1.length);
    System.arraycopy(a2, 0, ret, a1.length, a2.length);
    return ret;
}

From source file:MainClass.java

private static int[] insertElement(int original[], int element, int index) {
    int length = original.length;
    int destination[] = new int[length + 1];
    System.arraycopy(original, 0, destination, 0, index);
    destination[index] = element;//from w ww.j  a  v  a 2  s .co m
    System.arraycopy(original, index, destination, index + 1, length - index);
    return destination;
}

From source file:Main.java

public static Object cut(Object obj, int size) {
    int j;//from  www  . j a  va2  s .c  o m
    if ((j = Array.getLength(obj)) == 1) {
        return Array.newInstance(obj.getClass().getComponentType(), 0);
    }
    int k;
    if ((k = j - size - 1) > 0) {
        System.arraycopy(obj, size + 1, obj, size, k);
    }
    j--;
    Object obj1 = Array.newInstance(obj.getClass().getComponentType(), j);
    System.arraycopy(obj, 0, obj1, 0, j);
    return obj1;
}

From source file:Main.java

public static byte[] copyOfRange(byte[] original, int from, int to) {
    int newLength = to - from;
    if (newLength < 0) {
        throw new IllegalArgumentException(from + " > " + to);
    }/* www  .java 2  s  .c o  m*/
    byte[] copy = new byte[newLength];
    System.arraycopy(original, from, copy, 0, Math.min(original.length - from, newLength));
    return copy;
}

From source file:com.lankr.tv_cloud.support.qcloud.image.PicProcessSign.java

public static String sign(int appId, String secret_id, String secret_key, String bucket, long expired,
        String url) {/*from  w w  w  .  j a v a2 s .  co m*/
    //a=[appid]&b=[bucket]&k=[SecretID]&t=[currenTime]&e=[expiredTime]&l=[url link]
    if (empty(secret_id) || empty(secret_key)) {
        return null;
    }

    long now = System.currentTimeMillis() / 1000;
    String plain_text = String.format("a=%d&b=%s&k=%s&t=%d&e=%d&l=%s", appId, bucket, secret_id, now, expired,
            url);

    byte[] bin = HmacUtils.hmacSha1(secret_key, plain_text);

    byte[] all = new byte[bin.length + plain_text.getBytes().length];
    System.arraycopy(bin, 0, all, 0, bin.length);
    System.arraycopy(plain_text.getBytes(), 0, all, bin.length, plain_text.getBytes().length);

    all = Base64.encodeBase64(all);
    return new String(all);
}

From source file:Main.java

@SuppressWarnings("unchecked")
public static <T> T[] delete(T[] array, int index) {
    int length = array.length;
    if (index < 0 || index >= length) {
        throw new IndexOutOfBoundsException("Index: " + index + ", Length: " + length);
    }//from www  . ja  v a 2s .  c  o  m

    T[] result = (T[]) Array.newInstance(array.getClass().getComponentType(), length - 1);
    System.arraycopy(array, 0, result, 0, index);
    if (index < length - 1) {
        System.arraycopy(array, index + 1, result, index, length - index - 1);
    }

    return result;
}