Abstract Access

TestFieldHandling.java

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

public class TestFieldHandling {
	private int		Field1;
	private String	Field2;

	@Override
	public String toString() {
		return Field1 + Field2;
	}

	public static void main(String[] args) {
		Map<String, Object> m = new HashMap<>();
		m.put("Field1", 20);
		m.put("Field2", "Euro");
		TestFieldHandling tfh = test(TestFieldHandling.class, m);
		System.out.println(tfh.toString());
	}

	private static <T> T test(Class<T> tfhc, Map<String, Object> params) {
		try {
			T o = tfhc.newInstance();
			for (Entry<String, Object> entry : params.entrySet()) {
				Field f = tfhc.getDeclaredField(entry.getKey());
				if (Modifier.isFinal(f.getModifiers())) {
					continue;
				}
				boolean wasNotAcc = f.isAccessible();
				if (wasNotAcc) {
					f.setAccessible(true);
				}
				f.set(o, entry.getValue());
				if (wasNotAcc) {
					f.setAccessible(false);
				}
			}
			return o;
		} catch (InstantiationException | IllegalAccessException | SecurityException | NoSuchFieldException e) {
			e.printStackTrace();
			return null;
		}
	}
}