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变量那些事
2022-06-22 09:10:00 【C_x_330】
类的成员变量包括实例变量和类变量（静态变量）,成员方法包括实例方法和类方法（静态方法）
小误区 ：
在方法中定义的局部变量在该方法被执行时创建 ---->错误int a; -->不会分配内存空间
int a;a=5; -->会分配内存空间
只有当给变量赋值的时候才会分配内存空间
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