java我想让它变得更简单

Question

我这里有我的java代码，目标是输出应该如下所示： 问题NEL01A021問題 NEL01L01A021英語 11-22-2016 NEL01L01A021/NEL01L01A021问题。文本

我已经做了，但我想让它更简单。你能帮帮我吗？ 导入java。util。ArrayList

public class TestTabSeparator {

String str;
ArrayList<String> strings = new ArrayList<>();

TestTabSeparator(ArrayList<String> strings) {
    this.strings = strings;
}

void showArrayList() {

    for (int index = 0; index < this.strings.size(); index++) {
        System.out.print(this.strings.get(index) + "   ");
    }
}
}

另一类：

import java.util.Arrays;
import java.util.ArrayList;

public class TabSeparator {

public static void main(String[] args) {

    ArrayList<String> stringList = new ArrayList();

    String topicName = "problem";
    String title = "NEL01L01A021";
    String idTitle = "問題";
    String questionNo = "NEL01L01A021";
    String keyword = "英語";
    String comment = "11-22-2016";
    String bodyKey = "NEL01L01A021/NEL01L01A021-problem.txt";

    String[] str2 = new String[7];
    str2[0] = topicName;
    str2[1] = title;
    str2[2] = idTitle;
    str2[3] = questionNo;
    str2[4] = keyword;
    str2[5] = comment;
    str2[6] = bodyKey;

    stringList.addAll(Arrays.asList(str2));
    TestTabSeparator strList = new TestTabSeparator(stringList);
    strList.showArrayList();
}
}

Answer 1

我有两个建议。首先你可以做数组。asList直接在变量上列出，而不是首先创建数组

ArrayList<String> stringList = Arrays.asList(topicName, title, idTitle, questionNo, keyword, comment, bodyKey)

第二个showArrayList方法可以使用字符串简化。加入

void showArrayList() {
    System.out.print(String.join(" ", strings));
}

Answer 2

我是这样做的：

public class TestTabSeparator {

    private ArrayList<String> strings = new ArrayList<>();

    private TestTabSeparator(ArrayList<String> strings) {
        this.strings = strings;
    }
    private void showArrayList() {
        strings.stream().forEach(s -> System.out.print(s+"  "));
    }
    public static void main(String[] args) {

        String topicName = "problem";
        String title = "NEL01L01A021";
        String idTitle = "問題";
        String questionNo = "NEL01L01A021";
        String keyword = "英語";
        String comment = "11-22-2016";
        String bodyKey = "NEL01L01A021/NEL01L01A021-problem.txt";

        ArrayList stringList = new ArrayList(){{
            add(topicName);
            add(title);
            add(idTitle);
            add(questionNo);
            add(keyword);
            add(comment);
            add(bodyKey);
        }};
        TestTabSeparator strList = new TestTabSeparator(stringList);
        strList.showArrayList();
    }
}