Objekt deserialisieren ... Problem mit String

if(xxx.get(i).getName() == "hallo") return i;  

package adressbuch;
import java.util.*;
import javax.swing.*;
import java.io.*;
class TAdressbuch implements Serializable{
	private static Adressbuch a;// = new Adressbuch();
	public static void main(String parms) {
		/*a=new Adressbuch();
		Person max = new Person("Mustermann","Max"); 
		max.addAnschrift("Meerweg","12b",4711,"Java"); 
		max.addEmail("Privat", "max@mustermann.com"); 
		max.addTelefon("Privat", 4712); 
		max.addHandy("Privat", 4713); 
		max.addHandy("Privat", 4714); 
		a.addPerson(max);
		Person moritz = new Person("Meier"); 
		moritz.addHandy("Privat", 4715); 
		a.addPerson(moritz);
		a.saveMe();*/
		load();
		
		System.out.println(a.getIndexOf("Mustermann"));  
		
		a.printPerson(a.getIndexOf("Mustermann"));  
	}
	public static void load() {
		FileInputStream fis = null;
		ObjectInputStream ois = null;
		try {
			
			fis = new FileInputStream("test.xxx");  
			ois = new ObjectInputStream(fis);
			a = (Adressbuch)ois.readObject();
		}
		catch(IOException e) {
			
		}
		catch(ClassNotFoundException e) {
			
		}
		finally {
			try {
				ois.close();
				fis.close();
			}
			catch(IOException e){
				
			}
		}
	}
}
class Adressbuch implements Serializable {
	private ArrayList <Person>personen = new ArrayList();
	public void addPerson(Person p) {
		personen.add(p);
	}
	public int getIndexOf(String name) {
		for(int i=0;i<personen.size();i++) {
			System.out.println(personen.get(i).getName() + " " +name);  
			if(personen.get(i).getName() == name ) return i;
		}
		return -1;
	}
	public void printPerson(int index) {
		if(index != -1) {
			personen.get(index).printMe();
		}
		
	}
	public void saveMe() {
		FileOutputStream fis = null;
		ObjectOutputStream oos= null;
		try {
			fis = new FileOutputStream("test.xxx");  
			oos = new ObjectOutputStream(fis);
			oos.writeObject(this);
		}
		catch(IOException e) {
			
		}
		finally {
			try {
				oos.close();
				fis.close();
			}
			catch(IOException e){
				
			}
		}
	}
	

	
	
}
abstract class Kommunikationsmittel implements Serializable{
	private String typ;
	public void create(String typ) {
		this.typ = typ;
	}
	public String getTyp() {
		return typ;
	}
	public void setTyp(String s) {
		this.typ = s;
	}
}
class Email extends Kommunikationsmittel{
	private String addr;
	Email(String typ,String addr) {
		this.setTyp(typ);
		this.addr = addr;
	}
	public String getAddr() {
		return addr;
	}
	public void setAddr(String a) {
		this.addr = a;
	}
	public String toString() {
		return this.getTyp()+" - "+addr;  
	}
}
class Telefon extends Kommunikationsmittel  implements Serializable {
	private int nr;
	Telefon(String typ,int nr) {
		
		this.setTyp(typ);
		this.nr = nr;
	}
	public int getNr() {
		return nr;
	}
	public void setNr(int a) {
		this.nr = a;
	}
	
	public void printMe() {
		System.out.println(this.getTyp() + " - "+nr);  
	}
	public String toString() {
		return this.getTyp() + " - "+nr;  
	}
}
class Handy extends Telefon {
	Handy(String typ, int nr) {
		super(typ,nr);
	}
}
class Person  implements Serializable {
	
	private String name;
	private String vorname;
	private ArrayList <Handy>handys = new ArrayList();
	private ArrayList <Telefon>telefone = new ArrayList();
	private ArrayList <Email>emailaddressen = new ArrayList();
	private ArrayList <Anschrift>anschriften = new ArrayList();
	Person(String name,String vorname) {
		this.name = name;
		this.vorname = vorname;
	}
	Person(String name) {
		this.name = name;
	}
	public void addHandy(String typ,int nr) {
		handys.add(new Handy(typ,nr));
	}
	public void addEmail(String typ, String addr) {
		emailaddressen.add(new Email(typ,addr));
	}
	public void addTelefon(String typ,int nr) {
		telefone.add(new Telefon(typ,nr));
	}
	public void addAnschrift(String strasse, String hausnummer, int plz,String stadt) {
		this.anschriften.add(new Anschrift(strasse,hausnummer,plz,stadt));
	}
	public String getName() {
		return name;
	}
	public String getVorname() {
		return vorname;
	}
	public void printMe() {
		
		System.out.println("Name : "+getName());  
		System.out.println("Vorname : "+getVorname());  
		printAnschriften();
		printTelefone();
		printHandys();
		printEmail();
	}
	public void printHandys() {
		if(handys.size()>0) {
			for(int i=0;i<handys.size();i++) {
				System.out.println("["+(i+1)+"] :" + handys.get(i).toString());  
			}
		}
		else {
			System.out.println("Keine Handy(s) vorhanden");  
		}
	}
	public void printTelefone() {
		if(telefone.size()>0) {
			for(int i=0;i<telefone.size();i++) {
				System.out.println("["+(i+1)+"] :" + telefone.get(i).toString());  
			}
		}
		else {
			System.out.println("Keine Telefone vorhanden");  
		}
	}
	public void printEmail() {
		if(emailaddressen.size()>0) {
			for(int i=0;i<emailaddressen.size();i++) {
				System.out.println("["+(i+1)+"] :" + emailaddressen.get(i).toString());  
			}
		}
		else {
			System.out.println("Keine E-Mail Addressen vorhanden");  
		}
	}
	public void printAnschriften() {
		if(anschriften.size()>0) {
			for(int i=0;i<anschriften.size();i++) {
				System.out.println("["+(i+1)+"] :" + anschriften.get(i).toString());  
			}
		}
		else {
			System.out.println("Keine Anschrift(en) vorhanden");  
		}
	}
		
		
}


class Anschrift  implements Serializable {
	private String strasse;
	private String hausnummer;
	private int plz;
	private String stadt;
	Anschrift(String strasse, String hausnummer, int plz,String stadt) {
		this.strasse = strasse;
		this.hausnummer = hausnummer;
		this.plz = plz;
		this.stadt = stadt;
	}
	public String getStrasse() {
		return strasse;
	}
	public String getHausnummer() {
		return hausnummer;
	}
	public int plz() {
		return plz;
	}
	public void changeStrasse(String strasse) {
		this.strasse = strasse;
	}
	public void changeHausnummer(String hausnummer) {
		this.hausnummer = hausnummer;
	}
	public void changePlz(int plz) {
		this.plz = plz;
	}
	public void changeStadt(String stadt) {
		this.stadt = stadt;
	}
	public String toString() {
		return strasse + " "+hausnummer+" "+plz + " "+stadt;  
	}
	
}