java static learning

/*static learning */

class one {

public int a = 5;

static { // 类加载时就运行代码码

System.out.println("static");

}

static {

// static int b=2; error

System.out.println("static");

}

public static void test(int c) {

// static int b = 2; error

}

{

// 每次对象实例化就执行代码块

}

public static void main(String[] args) {

{

int a = 2;

System.out.println(a);

}

// int a=6; 生命周期从此开始,只到 error

{

int a = 3;

System.out.println(a);

}

}

}