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public class A {
int a; //方法1 先定义
//int a = 5; //方法2 定义时直接赋值
{System.out.println(a);} //如果有这样的处理
public A() {
a = 5; //方法1 然后在构造方法赋值
}
public static void main(String[] args) {
new A();
}
}
public class UserServiceImpl implements UserService
{
private UserDao userDao;
public UserServiceImpl()
{
this.userDao = new UserDao();
}
public class TestServlet extends HttpServlet
{
private UserService userService;
public TestServlet()
{
this.userService = new UserServiceImpl();
}
}
constructor(int a){
age = a;
}