public class Test{
    // 测试方法
 public static void main(String[] args) {
     //实例化对象，调用相关方法实现运行效果
     User one=new User();
     User two=new User();
    
     one.setUser("Lucy");
     one.setPass("123456");
    
     two.setUser("Mike");
     two.setPass("123456");
    
     System.out.println("用户名："+one.getUser());
     System.out.println("密码："+one.getPass());
     System.out.println("用户名："+two.getUser());
     System.out.println("密码："+two.getPass());
     System.out.println("===========================");
     System.out.println(new UserManager().checkUser(one,two));
    }
}

public class User{
    //定义属性用户名、密码
    private String userName;
    private String passWorld;
   
    public String getUser(){
        return userName;
    }
   
    public void setUser(String userName){
        this.userName=userName;
    }
   
    public String getPass(){
        return passWorld;
    }
   
    public void setPass(String passWorld){
        this.passWorld=passWorld;
    }
}

public class UserManager{
    // 用户信息验证的方法
    public String checkUser(User one, User two) {
       // 判断用户名和密码是否为空，是否一致
               String strau=one.getUser();
               String strap=one.getPass();
               String strbu=two.getUser();
               String strbp=two.getPass();
       if(strau!=null&&strap!=null){
           if(strbu!=null&&strbp!=null){
               if((strau.equals(strbu))&&(strap.equals(strbp))){
                   return "用户名和密码一致";
               }else{
                   return "用户名或密码不一致";
               }
           }else{
               return "请输入用户名和密码！";
           }
       }else{
           return "请输入用户名和密码！";
       }
    }
}