java 从 ArrayList 创建 JTable
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Create JTable from ArrayList
提问by Alexandre Huard
Now that I managed to put the objects from a file into a ArrayList, I have to display them into a JTable.
现在我设法将文件中的对象ArrayList放入JTable.
These are the 3 objects contained in my ArrayList
这些是包含在我的 3 个对象中 ArrayList
Lieu<Double, String>(45.573715, -73.900295, "p1");
Lieu<Double, String>(45.573882, -73.899748, "p2");
Lieu<Double, String>(45.574438, -73.900099, "p3");
In the Lieuclass I have the methods getX()and getY()
在Lieu课堂上我有方法getX()和getY()
But I can't figure out how to diplay them in a JTable.
但我不知道如何在JTable.
Longitude Latitude
45.573715 -73.900295
45.573882 -73.899748
45.574438 -73.900099
Here's what I have for a start:
这是我的开始：
public class MonModel extends AbstractTableModel{
@Override
public int getColumnCount() {
return 2;
}
@Override
public int getRowCount() {
return l.size();//l is the arraylist that contains the 3 elements
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
if(columnIndex==0){
return l.get(rowIndex).getX();
}
else if(columnIndex==1){
return l.get(rowIndex).getY();
}
return null;
}
回答by trashgod
Use your TableModelto create a JTableand add it to a JFrame. Also consider overriding getColumnName(), as shown here. See also How to Use Tables.
使用您TableModel创建一个JTable并将其添加到JFrame. 也可以考虑覆盖getColumnName()，如图所示这里。另请参阅如何使用表格。
MonModel model = new MonModel();
JTable table = new JTable(model);
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(new JScrollPane(table), BorderLayout.CENTER);
f.pack();
f.setLocationByPlatform(true);
f.setVisible(true);
回答by Amarnath
Use a TableModelfor showing data in the JTable. For Example:
使用 aTableModel显示JTable. 例如：
In UI class, set the table model to the table.
在 UI 类中，将表模型设置为表。
JTable table = new JTable(new MonModel());
Table Model class
表模型类
class MonModel extends AbstractTableModel {
private List<LatNLon> l;
private String[] columnNames = {"Longitude", "Latitude"};
public MonModel() {
l = new ArrayList<LatNLon>();
l.add(new LatNLon("45.573715", "-73.900295"));
l.add(new LatNLon("45.573715", "-73.900295"));
l.add(new LatNLon("45.573715", "-73.900295"));
}
@Override
public String getColumnName(int column) {
return columnNames[column];
}
public int getColumnCount() {
return 2;
}
public int getRowCount() {
return l.size();
}
public Object getValueAt(int rowIndex, int columnIndex) {
if(columnIndex==0){
return l.get(rowIndex).getX();
}
else if(columnIndex==1){
return l.get(rowIndex).getY();
}
return null;
}
}
Latitude and Longitude class.
纬度和经度类。
class LatNLon {
private String x;
private String y;
public LatNLon(String x, String y) {
this.x = x;
this.y = y;
}
// Code: For Getters and Setters.
}
Also read How to use Tables.
另请阅读如何使用表格。
