Question

可能重复：
Is there any way by which I can create a JTable using the data in an ArrayList?

我的程序代码如下：

//A loan Amortization example
public class LoanTable 
{

public static void main(String[] args) 
{
    double p,n,r,a,rb,ia,pa,pno=1;

    //creating a double arraylist
    List<double[]> l = new ArrayList<double[]>();

    p=250000;
    n=360;
    r=0.416/100;
    a=1342.05;

    rb=p;

//calculating the amount as interest, amount as principal and remaining balance 
    for(int i=1; i<=n;i++)
    {
        ia=(rb*r);
        pa=a-ia;
        rb=rb-pa;

        l.add(new double[] { pno,a,ia,pa,rb });

        pno++;

    }

    for (double[] row : l) 
    {
        System.out.println(Arrays.toString(row));

    }

}
}

如何导入行中的值以创建表格？导入值变得很困难。

输出有点像：

[1.0,1342.05,1040.0,302.04999999999999,249697.95]

[2.0,1342.05,1038.7434719999999,303.30652800000007,249394.64347200003]

[3.0,1342.05,1037.48171684352,304.56828315648,249090.07518884353]

[4.0,1342.05,1036.214712785589,305.835287214411,248784.23990162913]

[5.0,1342.05,1034.942437990777,307.1075620092229,248477.13233961992]

[6.0,1342.05,1033.6648705328187,308.3851294671813,248168.74721015274]

[7.0,1342.05,1032.3819883942353,309.6680116057646,247859.07919854697]

[8.0,1342.05,1031.0937694659553,310.9562305340446,247548.12296801293]

[9.0,1342.05,1029.8001915469338,312.2498084530662,247235.87315955988]

[10.0,1342.05,1028.501232343769,313.5487676562309,246922.32439190365]

感谢。

Answer 1

一种方法是使用List<double[]>作为AbstractTableModel中的后备数据。这个表模型有很多good examples可在线获得。

Answer 2

使用 JTable 时要理解的关键是每个JTable都由 TableModel 内部支持。如果您不熟悉使用表格，我建议将"How to Use Tables"作为开始学习实施的好地方

每个表模型基本上都实现了TableModel接口。对于您的场景，您应该考虑创建自己的表模型，扩展AbstractTableModel类。根据javadoc，

创建具体的TableModel作为AbstractTableModel的子类   您只需要提供以下三种方法的实现：

public int getRowCount（）;
   public int getColumnCount（）;
   public Object getValueAt（int row，int column）;

所以你的TableModel的实现将是 minimally 这样的事情[请注意我说的最低限度，因为你还想要覆盖这个类的其他方法，例如getColumnNames （...）]：

import java.util.List;  
import javax.swing.table.AbstractTableModel;

public class MyTableModel extends AbstractTableModel {

    private List<double[]> dataList;

    public MyTableModel(List<double[]> dataList){
        this.dataList = dataList;
    }

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

    @Override
    public int getColumnCount() {
        return (dataList.size() > 0) ? dataList.get(0).length : 0;
    }

    @Override
    public Object getValueAt(int rowIndex, int columnIndex) {

        if(rowIndex < dataList.size()){
            double[] columns = dataList.get(rowIndex);
            if(columns.length > columnIndex){
                return columns[columnIndex];
            }
        }
        return null;
    }
}

如何将数组列表中的数据导入JTable？

2 个答案: