将ArrayList转换为JTable的2d数组

Question

我有一个arrayList，由一个名称组成，后跟一个与该名称对应的分数。我想在Jtable中显示这些信息，但似乎有问题。我的表只显示2行。这是代码：

    int numberOfScores = allScores.size()/6; //arrayList of a username, followed by a score 
    Object[][] newArrayContent = new Object[numberOfScores][6];

    for(int x = 0; x<numberOfScores; x++){
        for(int z = 0; z < 6; z++){
        int y = 6 * x;
        newArrayContent [x][z] = allScores.get(y+z); 
        System.out.println(newArrayContent [x][z].toString());
        }
    }

    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    Object rowData[][] = newArrayContent;
    Object columnNames[] = { "username", "score"};
    JTable table = new JTable(newArrayContent, columnNames);

    JScrollPane scrollPane = new JScrollPane(table);
    frame.add(scrollPane, BorderLayout.CENTER);
    frame.setSize(300, 150);
    frame.setVisible(true);

我注意到如果我在columnNames[]中再添加2个列，我会得到4个结果，而不是2个，但它们在另一个用户列和另一个得分列下的表格中是水平的。我只想要一个2列和20-30行的普通表。有人可以帮忙吗？

Answer 1

你可以做一些轻微的调整，你应该好好继续你想要的。

public static void main(String[] args) throws Exception {
    List<String> allScores = new ArrayList<>();
    allScores.add("John Doe");
    allScores.add("95");
    allScores.add("Jane Doe");
    allScores.add("100");
    allScores.add("Stack Overflow");
    allScores.add("75");

    // Divide by 2instead of 6, since every 2 items makes a row
    int numberOfScores = allScores.size() / 2; // ArrayList of a username followed by a score 
    Object[][] newArrayContent = new Object[numberOfScores][2];

    // Counter to track what row is being created
    int rowIndex = 0;
    // Loop through the entire ArrayList.  Every two items makes a row 
    for (int i = 0; i < allScores.size(); i += 2) {
        newArrayContent[rowIndex][0] = allScores.get(i);
        newArrayContent[rowIndex][1] = allScores.get(i + 1);
        rowIndex++;
    }

    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    Object rowData[][] = newArrayContent;
    Object columnNames[] = {"username", "score"};
    // Use rowData instead of newArrayContent
    JTable table = new JTable(rowData, columnNames);

    JScrollPane scrollPane = new JScrollPane(table);
    frame.add(scrollPane, BorderLayout.CENTER);
    frame.setSize(300, 150);
    frame.setVisible(true);
}

结果：