в 17:44, 31 мая 2010

2010-05-31T17:44:26Z

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2010-05-31T15:19:27Z

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== A soft reference holds onto its referent until memory becomes low. ==



<source lang="java">
import java.lang.ref.SoftReference;
public class Main {
public static void main(String[] argv) throws Exception {
SoftReference<String> sr = new SoftReference<String>("object");
Object o = sr.get();
if (o != null) {
System.out.println(o);
} else {
System.out.println("collected or has been reclaimed");
}
}
}</source>



== Testing SoftReference ==



<source lang="java">
import java.lang.ref.PhantomReference;
import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.SoftReference;
import java.lang.ref.WeakReference;
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>

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Java Tutorial/Reflection/SoftReference - История изменений

в 17:44, 31 мая 2010

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