数据更改后刷新JTable [英] Refreshing JTable when data has changed

问题描述

我在刷新JTable时遇到问题.我从一个空的ArrayList开始，设置完我的组合框后，我将内容加载到ArrayList，但是JTable对此没有反应-它仍然为空. TableModel是否有问题?

I have a problem with refreshing a JTable. I start with an empty ArrayList and after setting my choice of a combo box I load content to the ArrayList but JTable does not react to it - it remains empty. Is it a problem with a TableModel?

这是我的代码...

public class ProjectTableModel extends AbstractTableModel{

    private static final long serialVersionUID = 1L;

    private static ArrayList<String> caseList = new ArrayList<String>();

    @Override
    public int getColumnCount() {
        return 1;
    }

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

    @Override
    public Object getValueAt( int row , int col) {
        getRowCount();
        switch(col){
            case 0:
                System.out.println("mam to");
                return caseList.get(row);
        }   
        return null;            
    }


    public void setCaseList(String[] list){
        for (int i =list.length - 1; i >= 0; i--) {
            caseList.add(list[i]);
        }
        System.out.println(getRowCount());
        fireTableDataChanged();
    }

    public String setValueAt(int row, int col){ 
        return null;
    }

    public void addTestCase(String name) throws IOException{    
        File newDir = new File(TestCaseMaker.currentDir, 
            "Przypadek testowy"+(caseList.size()+1));
        newDir.createNewFile();
        caseList.add(name);

        fireTableDataChanged();
    }

    public String getColumnName(int col) {
        return "Przypadki testowe";
    }
}

推荐答案

您对setValueAt()的实现不正确.它的签名错误，并且无法通知其视图.

Your implementation of setValueAt() is incorrect. It has the wrong signature, and it fails to notify its view.

附录:我 JTable 对数据模型的任何更改均不做出反应

作为参考， EnvTableTest 是使用AbstractTableModel的示例，该示例排除了编辑； isCellEditable()的默认实现始终返回false.

For reference, EnvTableTest is an example using AbstractTableModel that precludes editing; the default implementation of isCellEditable() always returns false.

@Override
public void setValueAt(Object aValue, int row, int col) {
    if (col == 1) {
        System.out.println("setValueAt: " + row + " " + aValue);
        // update caseList here
        this.fireTableCellUpdated(row, col);
    }
}

在此处有一个相关示例.

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