继承与初始化[Java编程思想]

 

import static net.mindview.util.Print.*;

class Insect {
	private int i = 9;
	protected int j;

	Insect() {
		print("i="+i + ", j="+j);
		j=39;
	}

	private static int x1 = printInit("static Insect.x1 initialized");
	static int printInit(String s) {
		print(s);
		return 47;
	}
}

public class Beetle extends Insect {
	private int k = printInit("Beetle.k initialized");
	
	public Beetle() {
		print("k=" + k);
		print("j=" + j);
	}

	private static int x2 = printInit("static Beetle.x2 initialized");

	public static void mian(String[] args) {
		print("Beetle constructor");
		Beetle b = new Beetle();
	}
}

输出:
static Insect.x1 initialized
static Beetle.x2 initialized
Beetle constructor
i=9, j=0
Beetle.k initialized
k=47
j=39