Added utility method to return all declared super class fields

test/zutil/ClassUtilTest.java

@@ -0,0 +1,57 @@
+package zutil;
+
+import junit.framework.TestCase;
+
+import java.lang.reflect.Field;
+import java.util.ArrayList;
+import java.util.List;
+
+
+public class ClassUtilTest extends TestCase {
+
+    public void testGetAllDeclaredFields() {
+        List<Field> fields = ClassUtil.getAllDeclaredFields(TestClass.class);
+        List<String> fieldNames = getFieldNames(fields);
+
+        assertEquals(4, fields.size());
+        assertTrue(fieldNames.contains("superPrivateInt"));
+        assertTrue(fieldNames.contains("superPublicInt"));
+        assertTrue(fieldNames.contains("protectedInt"));
+        assertTrue(fieldNames.contains("publicInt"));
+
+        fields = ClassUtil.getAllDeclaredFields(TestClass.class, TestSuperClass.class);
+        fieldNames = getFieldNames(fields);
+
+        assertEquals(2, fields.size());
+        assertFalse(fieldNames.contains("superPrivateInt"));
+        assertFalse(fieldNames.contains("superPublicInt"));
+        assertTrue(fieldNames.contains("protectedInt"));
+        assertTrue(fieldNames.contains("publicInt"));
+    }
+
+    // ----------------------------------------------------
+    // Utilities
+    // ----------------------------------------------------
+
+    private List<String> getFieldNames(List<Field> fields) {
+        List<String> names = new ArrayList<>();
+
+        for (Field field : fields)
+            names.add(field.getName());
+        return names;
+    }
+
+    // ----------------------------------------------------
+    // Test Classes
+    // ----------------------------------------------------
+
+    public static class TestSuperClass {
+        private int superPrivateInt = 10;
+        public int superPublicInt = 11;
+    }
+
+    public static class TestClass extends TestSuperClass {
+        protected int protectedInt = 20;
+        public int publicInt = 21;
+    }
+}