如何从arraylist填充jframe表? [英] How to fill a jframe table from an arraylist?

问题描述

我有一个使用 java GUI 创建的 jtable，我需要从数组列表中填充.我不熟悉 java，也不知道如何填充 jTable.我不知道我是否需要使用 TableModel 或只是 JTable table = new JTable(data, columnNames).这是我的代码:

I have a jtable that I created using java GUI and I need to fill from an arraylist. I'm not familiar with java and I have no idea how to fill a jTable. I don't know if I need to use TableModel or just JTable table = new JTable(data, columnNames). This is my code:

 public void filltable(){

    ArrayList A=new ArrayList();
    jframe4 j=new jframe4();
    String m=j.getloggedemail();

  //  A=s.getEmails(m);
  //this is an example of my arraylist

    A.add("[e-mail]");
    A.add("my subject");
    A.add("hiiii");

    try {
        String[] columnNames = {"Sender",
                        "Subject",
                        "Body",
                     };

         //here I need to fill my table


            }

        catch(Exception e) {
           JOptionPane.showMessageDialog(null, e);
        }
    }

这是我需要填写的jTable1的声明:

This is the declaration of jTable1 that I need to fill:

   jTable1.setModel(new javax.swing.table.DefaultTableModel(
        new Object [][] {
            {null, null, null},
            {null, null, null},
            {null, null, null},
            {null, null, null}
        },
        new String [] {
            "Sender", "Subject", "Body"
        }
    ));
    jScrollPane1.setViewportView(jTable1);

推荐答案

我不知道我是否需要使用 TableModel 或只是 JTable table = new JTable(data, columnNames)

I don't know if I need to use TableModel or just JTable table = new JTable(data, columnNames)

根据您的需要，您可以任意选择.我将演示如何使用后者.如果您想使用自己的 TableModel，请参阅@Andrew Thompson 评论中的链接.

Depends on your needs, you can do either. I will demonstrate how to use the latter. If you want to use your own TableModel, see the link in @Andrew Thompson's comment.

public class Example extends JFrame {

    Example() {

        String[] colNames = new String[] {"Sender", "Subject", "Body"};

        List<String> list = new ArrayList<>();
        list.add("[e-mail]");
        list.add("my subject");
        list.add("hiiii");
        list.add("[e-mail]");
        list.add("my subject2");
        list.add("hiiii2");

        String[][] rowData = new String[list.size() / colNames.length][colNames.length];
        for (int i = 0; i < rowData.length; i++) {
            for (int j = 0; j < rowData[i].length; j++) {
                rowData[i][j] = list.get(i * colNames.length + j);
            }
        }

        JTable table = new JTable(rowData, colNames);

        add(new JScrollPane(table));
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        pack();
        setLocationRelativeTo(null);
        setVisible(true);
    }

    public static void main(String[] args) {

        new Example();
    }
}

请注意，如果列表中没有一行包含 3 个元素，则不会显示整行.

Just note that if the list does not contain 3 elements in a row, the whole row will not be displayed.

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