相关疑难解决方法(0)

我有一个验证类:

public class User {
    @Size(min=3, max=20, message="User name must be between 3 and 20 characters long")
    @Pattern(regexp="^[a-zA-Z0-9]+$", message="User name must be alphanumeric with no spaces")
    private String name;

    @Size(min=6, max=20, message="Password must be between 6 and 20 characters long")
    @Pattern(regexp="^(?=.*[0-9])(?=.*[a-zA-Z])([a-zA-Z0-9]+)$", message="Password must contains at least one number")
    private String password;

    public User(String _name, String _password){
        super();
        name = _name;
        password = _password;
    }

    public String getName(){
        return name;
    }

    public String getPassword(){
        return password;
    }

    public void setPassword(String newPassword){ …

任何人都可以解释默认访问修饰符对于显式无参数构造函数(以及其他构造函数)的作用吗？