Java 如何更新 ArrayList 中某个位置的元素？
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How do I update the element at a certain position in an ArrayList?
提问by Saravanan
I have one ArrayListof 10 Strings. How do I update the index 5with another Stringvalue?
我有ArrayList10String秒之一。如何5使用另一个String值更新索引？
采纳答案by HaskellElephant
回答by Ramz
arrList.set(5,newValue);
and if u want to update it then add this line also
如果你想更新它，那么也添加这一行
youradapater.NotifyDataSetChanged();
回答by Andy
arrayList.set(location,newValue); location= where u wnna insert, newValue= new element you are inserting.
arrayList.set(location,newValue); location=您要插入的位置，newValue=您要插入的新元素。
notify is optional, depends on conditions.
notify 是可选的，取决于条件。
回答by IndianProgrammer1234
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);
}
}}
