[英]How to convert List of Objects into List of String array in java?
我有一個類,比如說 Person 具有所有 String 屬性。 我有一個 ArrayList<Person>。 我想將此 ArrayList<Person> 轉換為 List<String[]>。 我如何使用 java 轉換它?
我不確定我是否清楚地了解您的要求,但您始終可以對自己的人進行簡單的循環。
ArrayList<Person> people = new ArrayList<Person>();
List<String[]> everyonesAtt = new ArrayList<String[]>();
for (Person person : people) {
everyonesAtt.add(person.getAttributes());
}
以及 Person 類的示例:
public class Person {
private String name;
private String surname;
public String[] getAttributes(){
String[] atts = {name, surname};
return atts;
}
}
假設 person 類的每個屬性都是字符串數組中的一個項目,以下將完成這項工作:
人物等級:
public class Person {
private String title;
private String firstName;
private String lastName;
public Person(String title, String firstName, String lastName) {
super();
this.title = title;
this.firstName = firstName;
this.lastName = lastName;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
}
PersonConverter 類:
import java.util.ArrayList;
import java.util.List;
public class PersonConverter {
public List<String[]> convertPersonList(List<Person> list) {
List<String[]> result = new ArrayList<>();
for (Person p : list) {
result.add(convertPerson(p));
}
return result;
}
private String[] convertPerson(Person p) {
String[] persontAttributes = new String[3];
persontAttributes[0] = p.getTitle();
persontAttributes[1] = p.getFirstName();
persontAttributes[2] = p.getLastName();
return persontAttributes;
}
}
考試:
import java.util.ArrayList;
import java.util.List;
public class Main {
public static void main(String[] args) {
//create a person list
List<Person> personList = new ArrayList<>();
Person john = new Person("Mr.", "John", "Lenonn");
Person paul = new Person("Sir", "Paul", "McCartney");
personList.add(john);
personList.add(paul);
//create an instance of the person converter
PersonConverter pc = new PersonConverter();
//perform the conversion
List<String[]> convertedList = pc.convertPersonList(personList);
//print the result to the console
for (String[] stringArray : convertedList) {
for (String s : stringArray) {
System.out.println(s);
}
System.out.println();
}
}
}
這打印出來:
Mr.
John
Lenonn
Sir
Paul
McCartney
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