Evil Java File

FooTest.java

import java.lang.reflect.Method;
import java.lang.reflect.Field;

public class FooTest {
	static class Foo {
		private int hehe = 0;

		private void doSomething() {
			System.out.println("Foo!");
		}
	}
	
	public static void main(String[] args) throws Exception {
		Foo foo = new Foo();
		Method m = Foo.class.getDeclaredMethod("doSomething", new Class[]{});
		Field f = Foo.class.getDeclaredField("hehe");
		m.setAccessible(true);
		f.setAccessible(true);
		m.invoke(foo, new Object[]{});
		System.out.println(f.getInt(foo));
		f.set(foo, 10);
		System.out.println(f.getInt(foo));
	}
}