java - 如何将对象的一个​​元素转换为实例数组？

Question

我有这个类People，其中包含字段名称、电话、电子邮件和地址。这个类有很多实例。如何获取名称元素的所有实例的数组。例如，字符串[]数组=“约翰，蒂姆，哈利”。因此，我想做的就是从每个实例中取出一个元素并创建一个数组。我已经为此工作了很长时间。非常感谢您的帮助。顺便说一句，所有字段都是字符串。

Answer 1

1-创建人员模型

public class People {
private String name;
private String phone;
private String address;
public People(String name, String phone, String address) {
    this.name = name;
    this.phone = phone;
    this.address = address;
}
/**
 * @return the name
 */
public String getName() {
    return name;
}
/**
 * @param name the name to set
 */
public void setName(String name) {
    this.name = name;
}
/**
 * @return the phone
 */
public String getPhone() {
    return phone;
}
/**
 * @param phone the phone to set
 */
public void setPhone(String phone) {
    this.phone = phone;
}
/**
 * @return the address
 */
public String getAddress() {
    return address;
}
/**
 * @param address the address to set
 */
public void setAddress(String address) {
    this.address = address;
}

}

2-创建自定义适配器

public class PeopleListAdapter extends BaseAdapter {

private Context context;
private ArrayList<People> peopleItems;

public PeopleListAdapter(Context context,
        ArrayList<People> peopleItems) {
    this.context = context;
    this.peopleItems = peopleItems;
}

@Override
public int getCount() {
    return peopleItems.size();
}

@Override
public Object getItem(int position) {
    return peopleItems.get(position);
}

@Override
public long getItemId(int position) {
    return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    if (convertView == null) {
        LayoutInflater mInflater = (LayoutInflater) context
                .getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
        convertView = mInflater.inflate(R.layout.people_list_item, null);
    }
    // TODO
    /**
     * Return some list row..
     */
    TextView nameTxt = (TextView) convertView.findViewById(R.id.name);
    TextView phoneTxt = (TextView) convertView.findViewById(R.id.phone);
    TextView addressTxt = (TextView) convertView.findViewById(R.id.address);

    nameTxt.setText(peopleItems.get(position).getName());
    phoneTxt.setText(peopleItems.get(position).getPhone());
    phoneTxt.setText(peopleItems.get(position).getAddress());

    return convertView;
}

}

更新

private ArrayList<People> peopleList = new ArrayList<People>();
peopleList.add(new People("name1", "phone1","address1");
peopleList.add(new People("name2", "phone2","address2");

// adaptor
PeopleListAdapter adaptor = new PeopleListAdapter(getApplicationContext(),peopleList);
//some list view
listView.setAdapter(adapter);