Example usage for java.lang Class isArray

Introduction

In this page you can find the example usage for java.lang Class isArray.

Prototype

@HotSpotIntrinsicCandidate
public native boolean isArray();

Source Link

Document

Determines if this Class object represents an array class.

Usage

From source file:Main.java

public static Object expand(Object a) {
    Class cl = a.getClass();

    if (!cl.isArray()) {
        return null;
    }//from  w w  w  .j  a v  a2 s  . c o m

    int length = Array.getLength(a);
    int newLength = length + 1; // 50% more
    Class componentType = a.getClass().getComponentType();
    Object newArray = Array.newInstance(componentType, newLength);

    System.arraycopy(a, 0, newArray, 0, length);
    return newArray;
}

From source file:Main.java

public static Object arrayExpandAddSingle(Object array, Object elementsToAdd) {
    Class cl = array.getClass();
    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;
}

From source file:Main.java

public static boolean isEmptyArray(Object arrayObj) {
    if (null == arrayObj) {
        return true;
    }//from   ww w .  jav  a  2 s . c  om

    Class clazz = arrayObj.getClass();

    if (!clazz.isArray()) {
        return true;
    }

    if (Array.getLength(arrayObj) == 0) {
        return true;
    }

    return false;
}

From source file:ArrayGrowTest.java

/**
 * A convenience method to print all elements in an array
 * /*from  ww  w .  ja  v a  2 s.  co  m*/
 * @param a
 *          the array to print. It can be an object array or a primitive type
 *          array
 */
static void arrayPrint(Object a) {
    Class cl = a.getClass();
    if (!cl.isArray())
        return;
    Class componentType = cl.getComponentType();
    int length = Array.getLength(a);
    System.out.print(componentType.getName() + "[" + length + "] = { ");
    for (int i = 0; i < Array.getLength(a); i++)
        System.out.print(Array.get(a, i) + " ");
    System.out.println("}");
}

From source file:ArrayGrowTest.java

/**
 * This method grows an array by allocating a new array of the same type and
 * copying all elements./*from  www. j av  a  2 s. c  o  m*/
 * 
 * @param a
 *          the array to grow. This can be an object array or a primitive type
 *          array
 * @return a larger array that contains all elements of a.
 */
static Object goodArrayGrow(Object a) {
    Class cl = a.getClass();
    if (!cl.isArray())
        return null;
    Class componentType = cl.getComponentType();
    int length = Array.getLength(a);
    int newLength = length * 11 / 10 + 10;

    Object newArray = Array.newInstance(componentType, newLength);
    System.arraycopy(a, 0, newArray, 0, length);
    return newArray;
}

From source file:Main.java

public static Object arrayExpandAddElements(Object array, Object[] elementsToAdd) {
    Class cl = array.getClass();
    if (!cl.isArray())
        return null;
    int length = Array.getLength(array);
    int newLength = length + elementsToAdd.length;
    Class componentType = array.getClass().getComponentType();
    Object newArray = Array.newInstance(componentType, newLength);
    System.arraycopy(array, 0, newArray, 0, length);
    for (int i = 0; i < elementsToAdd.length; i++) {
        Array.set(newArray, length + i, elementsToAdd[i]);
    }/*w w  w  .ja v  a  2s.c o  m*/
    return newArray;
}

From source file:Main.java

public static Object arrayExpandAddElements(Object array, Collection elementsToAdd) {
    Class cl = array.getClass();
    if (!cl.isArray())
        return null;
    int length = Array.getLength(array);
    int newLength = length + elementsToAdd.size();
    Class componentType = array.getClass().getComponentType();
    Object newArray = Array.newInstance(componentType, newLength);
    System.arraycopy(array, 0, newArray, 0, length);
    int count = 0;
    for (Object element : elementsToAdd) {
        Array.set(newArray, length + count, element);
        count++;/*from ww w . j a  v  a2  s .  co m*/
    }
    return newArray;
}

From source file:ShowClass.java

public static String typeName(Class t) {
    String brackets = "";
    while (t.isArray()) {
        brackets += "[]";
        t = t.getComponentType();//w  w  w.j  a  v  a  2  s  .  c  om
    }
    String name = t.getName();
    int pos = name.lastIndexOf('.');
    if (pos != -1)
        name = name.substring(pos + 1);
    return name + brackets;
}

From source file:ArrayExpander.java

public static Object expand(Object array, int newSize) {
    if (array == null) {
        return null;
    }//from   www  . j  a  va 2  s .com
    Class c = array.getClass();
    if (c.isArray()) {
        int len = Array.getLength(array);
        if (len >= newSize) {
            return array;
        } else {
            Class cc = c.getComponentType();
            Object newArray = Array.newInstance(cc, newSize);
            System.arraycopy(array, 0, newArray, 0, len);
            return newArray;
        }
    } else {
        throw new ClassCastException("need  array");
    }
}

From source file:ArrayExpander.java

public static Object expandAtHead(Object array, int newSize) {
    if (array == null) {
        return null;
    }/*from   w w  w.ja  v  a2s .  c  o m*/
    Class c = array.getClass();
    if (c.isArray()) {
        int len = Array.getLength(array);
        if (len >= newSize) {
            return array;
        } else {
            Class cc = c.getComponentType();
            Object newArray = Array.newInstance(cc, newSize);
            System.arraycopy(array, 0, newArray, newSize - len, len);
            return newArray;
        }
    } else {
        throw new ClassCastException("need  array");
    }
}