如何迭代string对象中的特定元素(arraylist Java)

import java.util.ArrayList;
import java.util.Iterator;

public class Main {
    public static void main(String[] args) {
        String str = "Hello World";
        
        // 将String对象转换为ArrayList对象
        ArrayList<Character> charList = new ArrayList<>();
        for (char c : str.toCharArray()) {
            charList.add(c);
        }
        
        // 使用ArrayList的迭代器迭代特定元素
        Iterator<Character> iterator = charList.iterator();
        while (iterator.hasNext()) {
            Character character = iterator.next();
            // 迭代到特定元素时进行操作
            if (character == 'o') {
                // 修改特定元素
                iterator.remove();
            }
        }
        
        // 将ArrayList对象转换回String对象
        StringBuilder stringBuilder = new StringBuilder(charList.size());
        for (Character character : charList) {
            stringBuilder.append(character);
        }
        String modifiedStr = stringBuilder.toString();
        
        System.out.println(modifiedStr);  // 输出：Hell Wrld
    }
}