Различия
Здесь показаны различия между двумя версиями данной страницы.
| Предыдущая версия справа и слева Предыдущая версия | |||
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dev:java:lang:weakrefs [2012/08/04 18:45] jamis7005 |
dev:java:lang:weakrefs [2012/08/04 20:34] (текущий) jamis7005 |
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|---|---|---|---|
| Строка 2: | Строка 2: | ||
| <code java> | <code java> | ||
| - | + | class TestA { | |
| - | class TheStrong { | + | private Object link; |
| - | public Object link; | + | |
| public Object getLink(){ return link; } | public Object getLink(){ return link; } | ||
| - | public void print(Object newlink){ | + | public void setLinkAndPrint(Object newlink){ |
| link = 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 Object getLink(){ return link.get(); } | ||
| - | public void print(Object newlink){ | + | public void setLinkAndPrint(Object newlink){ |
| link = new WeakReference<>( 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) { |
| - | TheStrong thestrong = new TheStrong(); | + | TestA a = new TestA(); |
| - | thestrong.print(Arrays.asList(4,5,6)); | + | a.setLinkAndPrint(Arrays.asList(4,5,6)); |
| + | a.print(); | ||
| - | TheWeak theweak = new TheWeak(); | + | TestB b = new TestB(); |
| - | theweak.print(Arrays.asList(1,2,3)); | + | b.setLinkAndPrint(Arrays.asList(1,2,3)); |
| - | + | b.print(); | |
| - | Runtime r = Runtime.getRuntime(); | + | |
| - | r.gc(); | + | |
| - | + | ||
| - | System.out.println("TheWeak: its link=" + theweak.getLink()); | + | |
| - | System.out.println("TheStrong: its link=" + thestrong.getLink()); | + | |
| } | } | ||
| } | } | ||
| - | |||
| - | |||
| </code> | </code> | ||
| Строка 47: | Строка 52: | ||
| Result: | Result: | ||
| <code> | <code> | ||
| - | TheWeak: my link =[1, 2, 3] | + | promauto.batchext.TestA: link =[4, 5, 6] |
| - | TheStrong: my link =[4, 5, 6] | + | promauto.batchext.TestA: link =[4, 5, 6] |
| - | TheWeak: its link=null | + | promauto.batchext.TestB: link =[1, 2, 3] |
| - | TheStrong: its link=[4, 5, 6] | + | promauto.batchext.TestB: link =null |
| </code> | </code> | ||
