对方法的覆盖称为：动态分派举例

class Base {
	public int i = 1;

	public Base() {
		g();
	}

	public void f() {
		System.out.println("Base f");
	}

	public void g() {
		System.out.println("Base g");
	}
}

public class Derived extends Base {
	public int i = 2;

	public void f() {
		System.out.println("Derived f");
	}

	public void g() {
		System.out.println("Derived g");
	}

	public static void main(String args[]) {
		Base b = new Derived();
		b.f();
		System.out.println(b.i);
	}
}

Derived g
Derived f
1