jButton HashMap计数请点击 [英] jButton HashMap count click

问题描述

使用此链接中的代码将文本文件内容加载到GUI:

Using the code from this link loading text file contents to GUI:

Map<String, ArrayList<String>> sections = new HashMap<>();
String s = "", lastKey="";
try (BufferedReader br = new BufferedReader(new FileReader("input.txt"))) {
    while ((s = br.readLine()) != null) {
        String k = s.substring(0, 10).trim();
        String v = s.substring(10, s.length() - 50).trim();
        if (k.equals(""))
            k = lastKey;

        ArrayList<String> authors = null;
        if(sections.containsKey(k))
        {
            authors = sections.get(k);
        }
        else
        {
            authors = new ArrayList<String>();
            sections.put(k, authors);
        }
        authors.add(v);
        lastKey = k;
    }
} catch (IOException e) {
}

在@Michael Markidis的帮助下，使用以下代码对HashMap个项目进行计数:

With the help of @Michael Markidis counting the HashMap items using this code:

// to get the number of authors
int numOfAuthors = sections.get("AUTHOR").size();

现在我想使用numOfAuthors作为jButton1的参数，例如:

Now I w'd like to use numOfAuthors as a parameter of jButton1, for example:

jButton1.doClick(numOfAuthors);

实际上是GUI的一般结构:我有jPanel1和jTextField1和jButton1. jButton1将动态tf添加到jPanel2.

Actually general structure of GUI: I have jPanel1 with jTextField1 and jButton1. jButton1 adding dynamic tf to jPanel2.

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    SubPanel sub = new SubPanel();
    jPanel2.add(sub);
    jPanel2.revalidate();  
}

HashMap中的项目数为 12 ，因此我想将此数字用作jButton1的参数，然后单击 12 em>次并添加其他 12 sub.

The number of items in HashMap is 12, so I wo'd like to use this number as a parameter of jButton1 and click 12 times and add additional 12 sub's.

    System.out.println(numOfAuthors);
    Output: 12

但目前jButton1仅添加 1 sub.

我不明白为什么它不能正常工作.

I can't understand why it doesn't work properly.

推荐答案

编写一个实现ActionListener

public class Clicker implements ActionListener {

    @Override
    public void actionPerformed(ActionEvent e) {
    }

}

向此类添加数字的构造函数

Add a constructor to this class which takes a number

public class Clicker implements ActionListener {

    private int count;

    public Clicker(int count) {
        this.count = count;
    }

    @Override
    public void actionPerformed(ActionEvent e) {
    }

}

例如，使用它来确定所需要做的事情

Use this to make determinations about what you need to do, for example

@Override
public void actionPerformed(ActionEvent e) {
    for (int index = 0; index < count; index++) {
        SubPanel sub = new SubPanel();
        jPanel2.add(sub);
    }
}

然后您将在您的JButton

jButton1.addActionListener(new Clicker(12));

请记住，如果您先前已将任何ActionListener添加到按钮中，则需要先将其删除

Remember, if you've previously added any ActionListeners to the button, you'll want to remove them first

看看如何使用按钮，复选框和单选按钮按钮和如何为它编写动作监听器更多详情

对于稍微高级的方法，您可以考虑查看如何使用动作

For a slightly more advanced approach, you might consider having a look at How to Use Actions

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