code: public boolean usesField(String className, String fieldName) {
  		int classIndex = findClass(className);
  		if (classIndex == NOT_FOUND) return false;
  		int fieldNameIndex = findUtf8(fieldName);
  		if (fieldNameIndex == NOT_FOUND) return false;
  		
  		for (int i = 1; i < maxPoolSize; i++) {
  			if (types[i] == FIELD && readValue(offsets[i]) == classIndex) {
  				int nameAndTypeIndex = readValue(offsets[i] + 2);
  				if (readValue(offsets[nameAndTypeIndex]) == fieldNameIndex) return true;
  			}
  		}
  		return false;
  	}
docs: Checks if the constant pool contains a reference to a given field, either for writing or reading.
  
  @param className must be provided JVM-style, such as {@code java/lang/String}