类变量初始化顺序哈哈

我也不太清楚，先看代码吧；

class X {
	private static X instance = new X();
	
	int a = 1;
	{System.out.println(a);}
	
//	static int b;
	static int b = 2;//2
	static {System.out.println(b);}
	
	private X() {
		super();
		a = 5;
		b = 6;
		
	}
	
	public static X getInstance(){
		return instance;
	}
	
}
public class Singleton{
	public static void main(String[] args) throws ClassNotFoundException {
//		Class.forName("com.mine.test.X");
		System.out.println("----------------");
		X x1 = X.getInstance();
		System.out.println(x1.a);
		System.out.println(X.b);
		
	}
}

看了结果又点晕，
debug一下看了执行顺序，好了一点
有时间再深入研究下