initial commit

1 files changed, 82 insertions, 0 deletions

diff --git a/challenge-171/adam-russell/java/ch-2.java b/challenge-171/adam-russell/java/ch-2.java
new file mode 100644
index 0000000000..5fb543747e
--- /dev/null
+++ b/challenge-171/adam-russell/java/ch-2.java
@@ -0,0 +1,82 @@
+import java.lang.reflect.Method;
+
+class Compose{
+
+    private Method f, g;
+
+    public void setF(Method _f){
+        this.f = _f;
+    }
+    
+    public void setG(Method _g){
+        this.g = _g;
+    }
+
+    public int f(int x){
+        return x + x;
+    }
+    
+    public int g(int x){
+        return x * x;
+    }
+    
+    public int h(int x){
+        try{
+            return ((Integer) this.f.invoke(this, new Object[]{this.g.invoke(this, new Object[]{new Integer(x)})})).intValue();
+        }
+        catch(java.lang.reflect.InvocationTargetException ite){
+            exceptionMessageInvoke(ite);
+        }
+        catch(IllegalArgumentException iae){
+            exceptionMessageInvoke(iae);
+        }
+        catch(IllegalAccessException iae){
+            exceptionMessageInvoke(iae);
+        }
+        return -1;
+    }
+    
+    public Method compose(Method f, Method g){
+        setF(f);
+        setG(g);
+        Method h = null;
+        try{
+            h = Compose.class.getMethod("h", new Class[]{int.class});
+        }
+        catch(NoSuchMethodException e){
+            e.printStackTrace();
+        }
+        return h;
+    }
+    
+    public static void exceptionMessageInvoke(Exception e){
+         System.out.println("Error executing h");
+         e.printStackTrace();
+    }
+    
+    public static void main(String[] args){
+        Compose composer = new Compose();
+        try{
+            Method f = Compose.class.getMethod("f", new Class[]{int.class});
+            Method g = Compose.class.getMethod("g", new Class[]{int.class});
+            Method h = composer.compose(f, g);
+            try{
+                int x = ((Integer)h.invoke(composer, new Object[]{new Integer(7)})).intValue();
+                System.out.println(x);
+            }
+            catch(java.lang.reflect.InvocationTargetException ite){
+                exceptionMessageInvoke(ite);
+            }
+            catch(IllegalArgumentException iae){
+                exceptionMessageInvoke(iae);
+            }
+            catch(IllegalAccessException iae){
+                exceptionMessageInvoke(iae);
+            }
+        }
+        catch(NoSuchMethodException nsme){
+            System.out.println("Method not found.");
+            System.exit(1);
+        }
+    }
+}
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