Override Default Access, access private field in Java

//from w  ww  .  java 2  s.c o  m
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;

public class Main {
  public static void main(String[] argv) throws Exception {

    Class cls = java.lang.String.class;
    Method method = cls.getMethods()[0];
    Field field = cls.getFields()[0];
    Constructor constructor = cls.getConstructors()[0];

    field.setAccessible(true);
    constructor.setAccessible(true);
    method.setAccessible(true);

  }
}