Example usage for java.lang.ref WeakReference WeakReference

Introduction

In this page you can find the example usage for java.lang.ref WeakReference WeakReference.

Prototype

public WeakReference(T referent)

Source Link

Document

Creates a new weak reference that refers to the given object.

Usage

From source file:Main.java

public static void main(String[] argv) throws Exception {
    Object keyObject = "";
    Object valueObject = "";
    Map weakMap = new WeakHashMap();

    weakMap.put(keyObject, valueObject);
    WeakReference weakValue = new WeakReference(valueObject);

    weakMap.put(keyObject, weakValue);/*from   www  .  j  a  v a  2s  . c om*/

    Iterator it = weakMap.keySet().iterator();
    while (it.hasNext()) {
        Object key = it.next();
        weakValue = (WeakReference) weakMap.get(key);
        if (weakValue == null) {
            System.out.println("Value has been garbage-collected");
        } else {
            System.out.println("Get value");
            valueObject = weakValue.get();
        }
    }
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    Object keyObject = "";
    Object valueObject = "";
    Map<Object, Object> weakMap = new WeakHashMap<Object, Object>();

    weakMap.put(keyObject, valueObject);
    WeakReference weakValue = new WeakReference<Object>(valueObject);

    weakMap.put(keyObject, weakValue);/*from w ww.j a  v a2s.c  o  m*/

    Iterator it = weakMap.keySet().iterator();
    while (it.hasNext()) {
        Object key = it.next();
        weakValue = (WeakReference) weakMap.get(key);
        if (weakValue == null) {
            System.out.println("Value has been garbage-collected");
        } else {
            System.out.println("Get value");
            valueObject = weakValue.get();
        }
    }
}

From source file:Main.java

public static void forceGCandWait() {
    Object obj = new Object();
    WeakReference ref = new WeakReference<>(obj);
    obj = null;//from w ww.ja v a 2s.  co m

    System.gc();
    System.runFinalization();
    /** wait for garbage collector finished*/
    while (ref.get() != null)
        try {
            Thread.sleep(100);
        } catch (InterruptedException e) {
        } //System.gc();
}

From source file:Main.java

public static Intent getIntent(Context context, Class<?> actyClass) {
    Context loContext = new WeakReference<Context>(context).get();
    Intent intent = new Intent(loContext, actyClass);
    return intent;
}

From source file:Main.java

public static void startService(Context context, Class<?> actyClass) {
    Context loContext = new WeakReference<Context>(context).get();
    Intent intent = new Intent(loContext, actyClass);
    loContext.startService(intent);//  w  w  w .j  ava 2  s . c  om
}

From source file:Main.java

public static void observeObject(Object obj) {
    list.add(new WeakReference<Object>(obj));
}

From source file:Main.java

private static void setContext(Context context) {
    contextWR = new WeakReference<Context>(context);
}

From source file:Main.java

public static void addActivity(Activity a) {
    activitys.add(new WeakReference(a));
}

From source file:Main.java

public static void executeOnGlobalLayout(View view, final Runnable runnable) {
    final WeakReference<View> viewReference = new WeakReference<>(view);
    view.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
        @Override/*from  w  ww .j a  v  a 2  s .  c om*/
        public void onGlobalLayout() {
            removeOnGlobalLayoutListener(viewReference.get(), this);
            runnable.run();
        }
    });

}

From source file:Main.java

public synchronized static Thread CreateThread(Runnable run) {
    Thread thread = new Thread(run);
    threadlist.add(new WeakReference<>(thread));
    return thread;
}