java基础中作用域问题

public class NestVar {

public static void main(String[] args) {
    int count;
    for (count = 0; count < 10; count = count + 1) {
        System.out.println("This is count:" + count);

        for (count = 0; count < 2; count++){
            System.out.println("This is count:" + count);
            System.out.println("This program is in error!!!");
        }
    }
}

}
这段代码的输出结果是：

This is count:0

This is count:0

This program is in error!!!

This is count:1

This program is in error!!!

This is count:3 // 为什么会是3呢

This is count:0 // 为什么会初始化变量

This program is in error!!!

This is count:1

This program is in error!!!

This is count:3

This is count:0

This program is in error!!!

This is count:1

This program is in error!!!

This is count:3

This is count:0

This program is in error!!!

This is count:1

This program is in error!!!

This is count:3

This is count:0

This program is in error!!!

This is count:1

This program is in error!!!

This is count:3

......（死循环）

请大神不吝赐教！最好解释的详细点。新人没有币。

代码执行流程：
1.执行第一层for循环，此时count值是0,0<10，执行for循环体打印This is count:0
2.（此处是死循环）进入第二层循环，又将count重新初始化为0，0<2，打印This is count:0
This program is in error!!! 打印之后 count值++ ， 此时count值是1,1<2,
打印This is count:1
This program is in error!!! 之后count++ ， count此时值为2,2不<2 ，第二层循环不执行，此时执行第一层循环的count = count + 1;
此时count值是3，之后再次进入第一层循环的条件判断，3<10 ，执行循环体，This is count:3 然后在进入第二层循环 即再次从2.处循环...... 因此是个死循环

你把for(a;b;c){d}中的abc的执行顺序搞清楚，问题就解决一大半了。

因为你在第二层for循环里面重新给count赋值了啊，每次都赋值为0，所以肯定死循环掉了