Различия

Здесь показаны различия между двумя версиями данной страницы.

--- dev:java:lang:weakrefs [2012/08/04 18:40]
jamis7005 создано
+++ dev:java:lang:weakrefs [2012/08/04 20:34] (текущий)
jamis7005
@@ Строка 2: / Строка 2: @@
 <code java>
+class TestA {
-class TheStrong {
+	private Object link;
-	public Object link;
 	public Object getLink(){ return link; }
-	public void print(Object newlink){
+	public void setLinkAndPrint(Object newlink){
 		link = newlink;
-		System.out.println("TheStrong: my link =" + getLink());
+		print();
+	}
+	public void print(){
+		Runtime r = Runtime.getRuntime();
+		r.gc();
+		System.out.println(getClass().getName() + ":  link =" + getLink());
 	}
 }
-class TheWeak {
+class TestB {
-	public WeakReference<Object> link;
+	private WeakReference<Object> link;
 	public Object getLink(){ return link.get();	}
-	public void print(Object newlink){
+	public void setLinkAndPrint(Object newlink){
 		link =  new WeakReference<>( newlink );
-		System.out.println("TheWeak:   my link =" + getLink());
+		print();
+	}
+	public void print(){
+		Runtime r = Runtime.getRuntime();
+		r.gc();
+		System.out.println(getClass().getName() + ":  link =" + getLink());
 	}
 }
-public class Test {
+public class TestWeakRef {
-	public static void main(String[] args) throws IOException {
+	public static void main(String[] args) {
-		TheWeak a1 = new TheWeak();
+		TestA a = new TestA();
-		a1.print(Arrays.asList(1,2,3));
+		a.setLinkAndPrint(Arrays.asList(4,5,6));
+		a.print();
-		TheStrong b1 = new TheStrong();
-		b1.print(Arrays.asList(4,5,6));
-		Runtime r = Runtime.getRuntime();
+		TestB b = new TestB();
-		r.gc();
+		b.setLinkAndPrint(Arrays.asList(1,2,3));
+		b.print();
-		System.out.println("TheWeak:   its link=" + a1.link.get());
-		System.out.println("TheStrong: its link=" + b1.link);
 	}
 }
+</code>
+Result:
 <code>
+promauto.batchext.TestA:  link =[4, 5, 6]
+promauto.batchext.TestA:  link =[4, 5, 6]
+promauto.batchext.TestB:  link =[1, 2, 3]
+promauto.batchext.TestB:  link =null
+</code>