Verification of Java Login Registration

Import java.util.ArrayList;
Import java.util.List;
Import Java.util.Scanner;
Class person{
String Zhanhao;
String Mima;
Public person (String name,string ID) {

This.zhanhao=name;
This.mima=id;
}
@Override
Public String toString () {
TODO auto-generated Method Stub
Return "account =" +this.zhanhao+ "password =" +this.mima;
}
@Override
public boolean equals (Object obj) {
TODO auto-generated Method Stub
if (obj instanceof person) {
Person P = (person) obj;
if (P.zhanhao==this.zhanhao&&p.mima==this.mima) {
return true;
}else {
return false;
}
}else {
return false;
}




}
@Override
public int hashcode () {
TODO auto-generated Method Stub
return This.zhanhao.hashCode ();
}


}



Class zuce{
Static ArrayList shuju=new ArrayList ();
public void Paly () {

SYSTEM.OUT.PRINTLN ("Please select function: Register (A) login (B) exit system (Q)");
Scanner SCA = new Scanner (system.in);
String str = Sca.next ();
if (Str.equalsignorecase ("a")) {

Yi ();

}else if (str.equalsignorecase ("B")) {

ER ();

}else if (str.equalsignorecase ("C")) {

SYSTEM.OUT.PRINTLN ("Thank you for your use");

}else {

SYSTEM.OUT.PRINTLN ("Input error please restart");

}
}
public void Yi () {

System.out.println ("Please enter the registered account:");

Scanner SCA = new Scanner (system.in);

String str = Sca.next ();
for (int i = 0; i < shuju.size (); i++) {
Person P = (person) shuju.get (i);
if (P.zhanhao.equalsignorecase (str)) {
System.out.println ("The account you entered already exists, please re-enter");
Yi ();
Break
}
}

System.out.println ("Please enter password:");

Scanner SCA1 = new Scanner (system.in);

String sum = Sca1.next ();
Person P=new person (str, sum);
Shuju.add (P);

System.out.println (Shuju);
Paly ();

}
public void er () {
System.out.println ("Please enter your account:");
Scanner SCA = new Scanner (system.in);
String str = Sca.next ();
System.out.println ("Please enter password:");
Scanner SCA1 = new Scanner (system.in);
String sum = Sca1.next ();
Person P=new person (str, sum);
for (int i = 0; i < shuju.size (); i++) {
Person p1= (person) shuju.get (i);

if (P1.zhanhao.equals (P.zhanhao) &&p1.mima.equals (P.mima)) {

SYSTEM.OUT.PRINTLN ("Login Successful");
System.out.println ("User name:" +p.zhanhao);
Paly ();
}else {
SYSTEM.OUT.PRINTLN ("Login Failed");
Paly ();

}
}





}

}
public class Work2 {

/**
* @param args
*/
public static void Main (string[] args) {
TODO auto-generated Method Stub
Zuce zz=new zuce ();
Zz.paly ();

}

}

Verification of Java Login Registration