updated Java/Jython private field examples

Author: ramalho

.gitignore

@@ -5,6 +5,9 @@ __pycache__/
 # C extensions
 *.so
 
+# Java
+*.class
+
 # Distribution / packaging
 .Python
 env/

classes/private/Confidential.class

@@ -4,6 +4,6 @@ public class Confidential {
 	private String hidden = "burn after reading";
 
 	public Confidential(String text) {
-		this.secret = text;
+		this.secret = text.toUpperCase();
 	}
 }

classes/private/Confidential.java

@@ -3,18 +3,18 @@
 public class Expose {
 
 	public static void main(String[] args) {
-		Confidential message = new Confidential("text you shoudn't see");
-		Field privateField = null;
+		Confidential message = new Confidential("top secret text");
+		Field secretField = null;
 		try {
-			privateField = Confidential.class.getDeclaredField("secret");
+			secretField = Confidential.class.getDeclaredField("secret");
 		}
 		catch (NoSuchFieldException e) {
 			System.err.println(e);
 			System.exit(1);
 		}
-		privateField.setAccessible(true); // break the lock!
+		secretField.setAccessible(true); // break the lock!
 		try {
-			String wasHidden = (String) privateField.get(message);
+			String wasHidden = (String) secretField.get(message);
 			System.out.println("message.secret = " + wasHidden);
 		}
 		catch (IllegalAccessException e) { 

classes/private/Expose.class

@@ -1,6 +1,6 @@
 import Confidential
 
-message = Confidential("text you shoudn't see")
-private_field = Confidential.getDeclaredField('secret')
-private_field.setAccessible(True)  # break the lock!
-print 'message.secret =', private_field.get(message)
+message = Confidential('top secret text')
+secret_field = Confidential.getDeclaredField('secret')
+secret_field.setAccessible(True)  # break the lock!
+print 'message.secret =', secret_field.get(message)

classes/private/Expose.java

@@ -1,7 +1,7 @@
 from java.lang.reflect import Modifier
 import Confidential
 
-message = Confidential('never expose this')
+message = Confidential('top secret text')
 fields = Confidential.getDeclaredFields()
 for field in fields:
     # list private fields only

classes/private/expose.py

@@ -1,12 +1,17 @@
-# In the Jython registry:
-# python.security.respectJavaAccessibility = false
-# Setting this to false will allow Jython to provide access to
-# non-public fields, methods, and constructors of Java objects.
+
+"""
+In the Jython registry file there is this line:
+
+python.security.respectJavaAccessibility = true
+
+Set this to false and Jython provides access to non-public
+fields, methods, and constructors of Java objects.
+"""
 
 import Confidential
 
-message = Confidential("text you shoudn't see")
+message = Confidential('top secret text')
 for name in dir(message):
     attr = getattr(message, name)
-    if not callable(attr):  # ignore methods
-        print name, '=', attr
+    if not callable(attr):  # non-methods only
+        print name + '\t=', attr