Example usage for java.lang.reflect Constructor newInstance

Introduction

In this page you can find the example usage for java.lang.reflect Constructor newInstance.

Prototype

@CallerSensitive
@ForceInline 
public T newInstance(Object... initargs) throws InstantiationException, IllegalAccessException,
        IllegalArgumentException, InvocationTargetException

Source Link

Document

Uses the constructor represented by this Constructor object to create and initialize a new instance of the constructor's declaring class, with the specified initialization parameters.

Usage

From source file:Main.java

private static <T> T newInstance(Context context, Class clazz, Class[] constructorSig, Object... arguments) {
    try {/*from   w ww  . ja v  a  2  s .  com*/
        Constructor<?> constructor = clazz.getConstructor(constructorSig);
        return (T) constructor.newInstance(arguments);
    } catch (Exception e) {
        Log.w(LOG_TAG, "Cannot instantiate class: " + clazz.getName(), e);
    }
    return null;
}

From source file:Main.java

/**
 * Creates a new timer whose associated thread has the specified name in Java 1.5.
 * /* w  ww  .  j  av a 2  s  .c  om*/
 * @param name the name of the associated thread
 *
 */
public static Timer createTimer(String name) {
    try {
        Constructor c = Timer.class.getConstructor(new Class[] { String.class });
        return (Timer) c.newInstance(new Object[] { name });
    } catch (Throwable e) {
        // In cany case create new Timer
        return new Timer();
    }
}

From source file:Main.java

/**
 * Creates a new empty instance of the provided collection
 * /*  w  w  w .  j a v a2  s  . c o  m*/
 * @param <T>
 * @param in
 * @return
 */
public static <T> Collection<T> createEmpty(Collection<?> in) {
    Class<?> originalClass = in.getClass();
    try {
        Constructor<?> originalConstructor = originalClass.getConstructor(new Class[0]);
        return (Collection<T>) originalConstructor.newInstance(new Object[0]);
    } catch (IllegalArgumentException e) {
    } catch (InstantiationException e) {
    } catch (IllegalAccessException e) {
    } catch (InvocationTargetException e) {
    } catch (SecurityException e) {
    } catch (NoSuchMethodException e) {
    } finally {
        return null;
    }
}

From source file:Main.java

/**
 * Returns a filtered copy of the collection <code>coll</code>.
 *
 * @param coll the collection to filter.
 * @param p the predicate to filter by./*  w  w  w .  j  a  v  a2s  .c o m*/
 * @return a new collection.
 */

/*public static <T> Collection<T> filter(Collection<T> coll, Predicate<T> p){
Collection<T> c2 = newCollection(coll);
for(T obj: coll)
    if(p.apply(obj))
        c2.add(obj);
return c2;
}*/

private static <T> Collection<T> cloneCollection(Collection<T> coll) {
    try {
        Class cl = coll.getClass();
        Constructor con = cl.getConstructor(new Class[] { Collection.class });
        return (Collection<T>) con.newInstance(new Object[] { coll });
    } catch (Exception e) {
        if (coll instanceof List)
            return new LinkedList<T>(coll);
        if (coll instanceof Set)
            return new HashSet<T>(coll);
        throw new RuntimeException("Cannot handle this collection");
    }
}

From source file:Main.java

public static void loadContext(android.content.Context context, Field field, Object object)
        throws IllegalAccessException, InvocationTargetException, InstantiationException,
        NoSuchMethodException {/* w w  w  .  j  av a2  s .c om*/
    field.setAccessible(true);
    Class fType = (Class) field.getGenericType();
    Constructor constructor = fType.getConstructor(android.content.Context.class);
    if (constructor != null) {
        field.set(object, constructor.newInstance(context));
    }
}

From source file:ee.ria.xroad.proxy.clientproxy.HandlerLoader.java

private static Handler instantiate(Class<? extends Handler> handlerClass, HttpClient client) throws Exception {
    try {//w  w  w.jav a  2 s . c  om
        Constructor<? extends Handler> constructor = handlerClass.getConstructor(HttpClient.class);
        return constructor.newInstance(client);
    } catch (NoSuchMethodException e) {
        throw new Exception("Handler must have constructor taking " + "1 parameter (" + HttpClient.class + ")",
                e);
    }
}

From source file:Main.java

public static Object newInstance(String paramString, Object[] paramArrayOfObject,
        Class<?>[] paramArrayOfClass) {
    try {//from  w  w  w .ja v  a2 s . c  o m
        Constructor e = Class.forName(paramString).getDeclaredConstructor(paramArrayOfClass);
        e.setAccessible(true);
        return e.newInstance(paramArrayOfObject);
    } catch (Exception var4) {
        var4.printStackTrace();
        return null;
    }
}

From source file:Main.java

public static <T extends Object> T newInstance(Class<T> cl, Object... args) throws NoSuchMethodException,
        IllegalAccessException, InvocationTargetException, InstantiationException {
    Constructor<T> constructor = cl.getDeclaredConstructor(new Class[0]);
    boolean accessible = constructor.isAccessible();
    constructor.setAccessible(true);/*from ww w.  ja  v a 2 s .co  m*/
    T t = constructor.newInstance(args);
    constructor.setAccessible(accessible);
    return t;
}

From source file:Main.java

public static Map<String, Object> getProperties(Element paramElement) {
    HashMap<String, Object> localHashMap = new HashMap<String, Object>();
    Element[] arrayOfElement = getChildrenByName(paramElement, "property");
    for (int i = 0; i < arrayOfElement.length; ++i) {
        String str1 = arrayOfElement[i].getAttribute("name");
        String str2 = arrayOfElement[i].getAttribute("type");
        String str3 = getText(arrayOfElement[i]);
        try {/*from  w  w w.j  a  v  a  2  s .c om*/
            Class<?> localClass = Class.forName(str2);
            Constructor<?> localConstructor = localClass.getConstructor(new Class[] { String.class });
            Object localObject = localConstructor.newInstance(new Object[] { str3 });
            localHashMap.put(str1, localObject);
        } catch (Exception localException) {
            System.err.println(
                    "Unable to parse property '" + str1 + "'='" + str3 + "': " + localException.toString());
        }
    }
    return localHashMap;
}

From source file:org.eclipse.virgo.ide.ui.editors.PdeCompatibilityUtil.java

public static IEditorInput createSystemFileEditorInput(File file) {
    if (isEclipse34) {
        Class<?> systemFileEditorInputClass;
        try {//from   w  w  w.  j  a v  a2  s.  co  m
            systemFileEditorInputClass = Class
                    .forName("org.eclipse.pde.internal.ui.editor.SystemFileEditorInput");
            Constructor<?> constructor = systemFileEditorInputClass.getConstructor(File.class);
            return (IEditorInput) constructor.newInstance(file);
        } catch (ClassNotFoundException e) {
            isEclipse34 = false;
        } catch (Throwable e) {
            SpringCore.log(new Status(IStatus.ERROR, ServerIdeUiPlugin.PLUGIN_ID,
                    "Failed to create instance of SystemFileEditorInput"));
            isEclipse34 = false;
        }
    }
    return null;
}