package secondpackage;

import java.util.ArrayList;
import java.util.List;

public class ceshi2 {
public static void main(String[] args) {

    List<Character> li = new ArrayList<Character>();
    li.add('a');
    li.add('b');
    li.add('c');
    StringBuilder str = new StringBuilder();
    for (Character character : li) {// 對ArrayList進行遍歷，將字元放入StringBuilder中
        str.append(character);
    }
    System.out.println("輸出從ArrayList中的所有字元" + str.toString());

}
 

}