Java by API/java.lang.ref/Reference — различия между версиями
Admin (обсуждение | вклад) м (1 версия) |
|
(нет различий)
|
Версия 20:43, 31 мая 2010
Reference: get()
<source lang="java">
import java.lang.ref.Reference; import java.lang.ref.ReferenceQueue; import java.lang.ref.SoftReference; import java.util.HashMap; public class Main {
public static void main(String[] args) { ReferenceQueue referenceQueue = new ReferenceQueue(); Object object = new Object() { public String toString() { return "Referenced Object"; } }; Object data = new Object() { public String toString() { return "Data"; } }; HashMap map = new HashMap(); Reference reference = new SoftReference(object, referenceQueue); map.put(reference, data); System.out.println(reference.get()); System.out.println(map.get(reference)); System.out.println(reference.isEnqueued()); System.gc(); System.out.println(reference.get()); System.out.println(map.get(reference)); System.out.println(reference.isEnqueued()); object = null; data = null; System.gc(); System.out.println(reference.get()); System.out.println(map.get(reference)); System.out.println(reference.isEnqueued()); }
}
</source>
Reference: isEnqueued()
<source lang="java">
import java.lang.ref.Reference; import java.lang.ref.ReferenceQueue; import java.lang.ref.SoftReference; import java.util.HashMap; public class Main {
public static void main(String[] args) { ReferenceQueue referenceQueue = new ReferenceQueue(); Object object = new Object() { public String toString() { return "Referenced Object"; } }; Object data = new Object() { public String toString() { return "Data"; } }; HashMap map = new HashMap(); Reference reference = new SoftReference(object, referenceQueue); map.put(reference, data); System.out.println(reference.get()); System.out.println(map.get(reference)); System.out.println(reference.isEnqueued()); System.gc(); System.out.println(reference.get()); System.out.println(map.get(reference)); System.out.println(reference.isEnqueued()); object = null; data = null; System.gc(); System.out.println(reference.get()); System.out.println(map.get(reference)); System.out.println(reference.isEnqueued()); }
}
</source>