IntPtr fieldId = JNIEnv.GetFieldID(objClass, "fieldName", "fieldType");
IntPtr fieldId = JNIEnv.GetFieldID(objClass, "fieldName", "fieldType"); int value = JNIEnv.GetIntField(obj, fieldId);This example first retrieves the field ID for a specified field in a Java object using the GetFieldID method. It then retrieves the integer value of the field using the GetIntField method. The package and library for JNIEnv GetFieldID is part of the Java Native Interface (JNI) library, which is used to enable Java code to interact with code written in other languages, such as C++. The JNIEnv class is part of the JNI library and provides methods for interacting with the Java Virtual Machine (JVM).