Java StringBuilder是否根据索引输出？

若第一个输入是“狗”，第二个输入是“狼”，第三个输入是“猫”。结果如下：

Dog | Wolf | Wolf | Cat | Cat | Cat |

我的forloop是否导致此循环过于频繁

public class LabTextManipulation {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        ArrayList<String> parks = new ArrayList<String>();
        String enteredPark;
        StringBuilder sb = new StringBuilder();
        boolean stop = true;
        while (stop == true) {
            System.out.println("Please enter your favorite National Park or Done to stop: ");
            enteredPark = input.nextLine();
            if (!"Done".equalsIgnoreCase(enteredPark)) {
                parks.add(new String(enteredPark));
                for (int i = 0; i < parks.size(); i++) {
                    sb.append(enteredPark + " | ");
                }//end for
            } else {
                stop = false;
            }
        }

        String nationalParks = sb.toString();
        System.out.println(nationalParks);
    }
}

实际：

" Dog | Wolf | Wolf | Cat | Cat | Cat |"

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这是问题的根源

for(int i = 0;i < parks.size(); i++ ) {
    sb.append(enteredPark + " | ");
}

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一直都是这样谢谢，根本不需要forloop。谢谢@m、 安特科维茨

for(int i = 0;i < parks.size(); i++ ) {
    sb.append(enteredPark + " | ");
}

if(!"Done".equalsIgnoreCase(enteredPark)) {
    parks.add(enteredPark); // also don't create new String here
    sb.append(enteredPark + " | ");
}