java : add CallbacksTest

1 files changed, 29 insertions, 0 deletions

diff --git a/java/CallbacksTest.java b/java/CallbacksTest.java
new file mode 100644
index 0000000..8a4d73f
--- /dev/null
+++ b/java/CallbacksTest.java
@@ -0,0 +1,29 @@
+
+abstract class Callback<TRet, TParam>
+{
+    public abstract TRet call(TParam p);
+}
+
+class Caller
+{
+    private Integer doCall(String s, Callback<Integer, String> cb)
+    {
+        return cb.call(s);
+    }
+
+    public Integer convert(final String s)
+    {
+        return doCall(s, new Callback<Integer, String>() {
+            public Integer call(String s) { return Integer.parseInt(s); }
+        });
+    }
+}
+
+public class CallbacksTest
+{
+    public static void main(String [] args )
+    {
+        Caller c = new Caller();
+        System.out.println(c.getClass().getName() + " " + c.convert("666"));
+    }
+}