JTable 和自定义 TableModel 未按预期运行

Question

所以我一直在通读 Java 的 "How to use Tables"，因为我试图在我的程序中实现 JTable。我想要的是从数据库中获取一个字符串值列表，然后按列名和行名对它们进行排序。现在我知道没有像列那样的默认行 Header，所以我一直通过将第一列设为 "row header" 来回避这一点。因此，我决定为我的 Jtable 创建一个自定义 Table 模型，以便正确排序数据（数据存储在 Vector of Vectors of Strings & column/row names 作为Vector of Strings separately) 但我运行遇到的只是问题。起初我收到一大堆索引错误的数组，所以我添加了代码来显示 table 模型中的数据被放入 Jtable 的位置。所以这里是我的 Jpanel 中初始化我的 Jtable

的代码

    //other GUI stuff above: buttons, labels, etc.
    Vector<String> tableColNames = new Vector<String>(1);
    Vector<String> tableRowNames = new Vector<String>(1); 
    Vector<Vector<String>> tableData = new Vector<Vector<String>>(1,1); //<row, col>

    for(int i = 0; i <50; i++){
        tableData.insertElementAt(new Vector<String>(), i);
        for(int b = 0; b<5; b++){
            tableData.elementAt(i).insertElementAt("TestData", b);
        }
        tableRowNames.insertElementAt("TestRowNames", i);
    }

    for(int a = 0; a<5; a++){
        tableColNames.insertElementAt("TestColNames", a);
    }

    System.out.println(tableData.toString());


    table = new JTable(new SemesterTableModel(tableColNames, tableRowNames, tableData));
    table.getColumnModel().getColumn(0).setCellRenderer(new JRowHeader());//Makeshift "rowHeader"
    table.setRowHeight(30);
    table.setAutoResizeMode(JTable.AUTO_RESIZE_ALL_COLUMNS);
    table.setBackground(Color.LIGHT_GRAY);



    JScrollPane scrollPane = new JScrollPane(table);
    //scrollPane.setBackground(Color.BLUE);
    springLayout.putConstraint(SpringLayout.WEST, scrollPane, 180, SpringLayout.WEST, this);
    springLayout.putConstraint(SpringLayout.NORTH, lblCumGPA, 30, SpringLayout.NORTH, scrollPane);
    springLayout.putConstraint(SpringLayout.EAST, comboBoxSemester, -15, SpringLayout.WEST, scrollPane);
    springLayout.putConstraint(SpringLayout.EAST, lblCumGPA, -15, SpringLayout.WEST, scrollPane);
    springLayout.putConstraint(SpringLayout.EAST, lblSemGPA, -15, SpringLayout.WEST, scrollPane);
    springLayout.putConstraint(SpringLayout.SOUTH, btnRemoveSemester, 0, SpringLayout.SOUTH, scrollPane);
    springLayout.putConstraint(SpringLayout.EAST, scrollPane, -15, SpringLayout.EAST, this);
    springLayout.putConstraint(SpringLayout.NORTH, scrollPane, 15, SpringLayout.NORTH, this);
    springLayout.putConstraint(SpringLayout.SOUTH, scrollPane, -15, SpringLayout.SOUTH, this);

    add(scrollPane);

    table.setFillsViewportHeight(true);

所以在这里你看到我用我的学期Table模型初始化我的 Jtable 并将我的 3 个向量作为我的学期Table模型的参数传递。然后在下面传递：

public class SemesterTableModel extends AbstractTableModel {

private Vector<String> colNames, rowNames;
private Vector<Vector<String>> data;

public SemesterTableModel() {
    colNames = new Vector<String>(1);
    rowNames = new Vector<String>(1);
    data = new Vector<Vector<String>>(1,1);
}

public SemesterTableModel(Vector<String> colNames, Vector<String> rowNames, Vector<Vector<String>> data){
    this.colNames = colNames;
    this.rowNames = rowNames;
    this.data = data;
}

@Override
public int getColumnCount() {
    return colNames.size();
}

@Override
public int getRowCount() {
    return rowNames.size();
}

@Override
public Object getValueAt(int col, int row) {
    if(col == 0)
        return rowNames.elementAt(row);
    else if(col >=5 || row >=5) //This is the code I added to figure out where my data was going, before I added this else if statement I was getting the array-index out of bounds errors
        return "Out of Bounds";
    else
        return data.elementAt(row).elementAt(col);
}

@Override
public boolean isCellEditable(int row, int col){
    if(col == 0 || row < 5){ //5 is an arbitrary number, I really want this to be an arbitrary variable that will be dependent on another class I haven't finished yet.
        return false;
    }
    return true;
}

}

所以现在当我运行我的程序时，我的 table 看起来像这样。

自然我希望 "TestData" 位于 "row Headers" 和列 Header 之间， "TestRowNames" 仅在第一列中，然后我也有"TestColNames" 甚至没有出现（如果我没记错的话我需要通过 Jtable 本身而不是 Table 模型更改列 Header）。 =14=]

显然我不理解这里的某些东西，我一直在用头敲键盘一段时间，现在试图弄清楚这个问题。如果你们知道发生了什么事或有任何建议，我会洗耳恭听。

Answer 1

TableModel#getValueAt 应该是 int row, int col 而不是 int col, int row...

public Object getValueAt(int row, int col) {

您必须删除 "out of bounds" 检查才能使其完全正常工作...因为有超过 5 行

仔细查看 How to Use Scroll Panes 了解如何实现您自己的行 header 而无需伪造它...

JTable 和自定义 TableModel 未按预期运行

JTable & custom TableModel not acting as expected

java

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jtable

tablemodel