How to retrieve similar values inside of object that inside ArrayList of objects.

Question

public class People{
private String name;
private String email;
private String accountnum;

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getEmail() {
return email;
}

public void setEmail(String email) {
this.email = email;
}

public String getAccountnum() {
return accountnum;
}

public void setAccountnum(String accountnum) {
this.accountnum= accountnum;
}

public People(String name, String email, String accountnum) {
this.name = name;
this.email = email;
this.accountnum= accountnum;
}
}

I have a ArrayList of objects that created from this class

People peop1 = new People("john", "[e-mail]", "56hk");
People peop2 = new People("Rose", "[e-mail]", "5689hk");
People peop3 = new People("john", "[e-mail]", "5676hk");

List<People> peoplelist = new ArrayList<People>();

peoplelist .add(peop1);
peoplelist.add(peop2 );
peoplelist .add(peop3 );

What i want to do is to retrieve the email and its accountnums.
like this

[e-mail] = {56hk,5676hk}

I know i can loop through and return a map or something like that.

Are there any other way to do that?

Answer 1

Duvindu pamaljith Use lambda or enhanced loop.

Answer 2

If you want to search for people with similar names and return their record then this is a simple way-

peoplelist.stream()
.filter(f-> "john".equals(f.getName()))
.forEach(s-> System.out.println(s));

This was just a suggestion and there exists lot of other ways as well.