Question

我有以下JTable模型：

public class TableModel extends AbstractTableModel{

    private String[] columnNames = {"Name", "BornDate", "Salary", "Age", "City"};

    private List<Person> personList;

    public TableModel(List<Person> personList){
        this.personList=personList;
    }

    public int getRowCount() {
        return personList.size();
    }

    public Object getValueAt(int arg0, int arg1) {
        // TODO Auto-generated method stub
        return null;
    }

    public List<Person> getpersonList() {
        return personList;
    }

    public void setPersonList(List<Person> personList) {
        this.personList = personList;
        fireTableDataChanged();
    }

    public void setPerson(Person sb){
        personList.add(sb);
        fireTableRowsInserted(personList.size()-1, personList.size()-1);
    }

    @Override 
    public String getColumnName(int index) { 
        return columnNames[index]; 
    } 

    @Override
    public int getColumnCount() {
        return columnNames.length;
    }

    public String[] getColumnNames() {
        return columnNames;
    }

    public void setColumnNames(String[] columnNames) {
        this.columnNames = columnNames;
    }
}

我想给JTable我的数据对象列表以显示我的数据。我知道我可以将它们转换为Object[][]来填充数据。但是，我想在我的桌面模型上做到这一点？

是否有一种优雅的方式将我的数据放在JTable中的TableModel上？

感谢您的回答！

Answer 1

您必须在TableModel中实现Person Fileds的获取逻辑。

public class PersonTableModel extends AbstractTableModel {

    private List<Person> people;

    private static final int DATA = 0;

    private static final int NAME = 1;

    private static final int SURNAME = 2;

    private static final int AGE = 3;

    private static final String[] columns = new String[]{"Date", "Name", "Surname", "Age"};

    private static final Class<?>[] clazz = {Date.class, String.class, String.class, Integer.class};

    public PersonTableModel(List<Person> people) {
        this.people = people;

    }

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

    @Override
    public int getColumnCount() {
        return columns.length;
    }

    @Override
    public String getColumnName(int columnIndex) {
        return columns[columnIndex];
    }

    @Override
    public Class<?> getColumnClass(int columnIndex) {
        return clazz[columnIndex];
    }

    @Override
    public Object getValueAt(int rowIndex, int columnIndex) {
        Person a = getPerson(rowIndex);

        if(a != null) {
            switch (columnIndex) {
                case DATA:
                    return a.getData().toGregorianCalendar().getTime();
                case NAME:
                    return a.getName();
                case SURNAME:
                    return a.getSurname();
                case AGE:
                    return a.getAge();
            }
        }
        return "";
    }

    public Person getPerson(int rowIndex) {
        if (getRowCount() > rowIndex && rowIndex >= 0) {
            return people.get(rowIndex);
        }
        return null;
    }
}

方法getValueAt由表自动调用！

Answer 2

从外观上看，您还没有实现 getValueAt 方法。这是获取将填充表格单元格的值的关键。

您的实现应该如下所示：

public Object getValueAt(int row, int col) {

    Person person = personList.get(row);
    switch (col) {
    case 0:
        return person.getName();
    case 1:
        return person.getBorndate();
    case 2:
        return person.getSalary();
    case 3:
        return person.getAge();
    case 4:
        return person.getCity();
    default:
        break;
    }
}

显示JTable中的对象列表

2 个答案: