问题
I have one ArrayList of 10 Strings. How do I update the index 5 with another String value?
回答1:
Let arrList be the ArrayList and newValue the new String, then just do:
arrList.set(5, newValue);
This can be found in the java api reference here.
回答2:
list.set(5,"newString");
- Reference
回答3:
arrList.set(5,newValue);
and if u want to update it then add this line also
youradapater.NotifyDataSetChanged();
回答4:
import java.util.ArrayList;
import java.util.Iterator;
public class javaClass {
public static void main(String args[]) {
ArrayList<String> alstr = new ArrayList<>();
alstr.add("irfan");
alstr.add("yogesh");
alstr.add("kapil");
alstr.add("rajoria");
for(String str : alstr) {
System.out.println(str);
}
// update value here
alstr.set(3, "Ramveer");
System.out.println("with Iterator");
Iterator<String> itr = alstr.iterator();
while (itr.hasNext()) {
Object obj = itr.next();
System.out.println(obj);
}
}}
回答5:
arrayList.set(location,newValue); location= where u wnna insert, newValue= new element you are inserting.
notify is optional, depends on conditions.
来源：https://stackoverflow.com/questions/4352885/how-do-i-update-the-element-at-a-certain-position-in-an-arraylist