java - 程序中面临以下错误

Question

jTable1 = new javax.swing.JTable();
String columns[]={"ID","Subject","Author","Type"};
jTable1.setModel(new javax.swing.table.DefaultTableModel(this.arr,columns));

jTable1.setName("jTable1"); // NOI18N

jTable1.addAncestorListener(new javax.swing.event.AncestorListener() {
    public void ancestorMoved(javax.swing.event.AncestorEvent evt) {
    }
    public void ancestorAdded(javax.swing.event.AncestorEvent evt) {
        jTable1AncestorAdded(evt);
    }
    public void ancestorRemoved(javax.swing.event.AncestorEvent evt) {
    }
});

jScrollPane1.setViewportView(jTable1);

在这段代码中，一切都很好，但它没有在 jtable 中打印任何内容。即使我已经检查过该数组不包含空值并且它包含其中的值。没有语法错误。谁能告诉我这段代码不在表中显示数据的原因是什么？

Answer 1

不太确定您收到的错误是什么。

但是通过添加这样的 stub 数组:

static String[][] arr = {
    { "some Id1", "some subject1", "some author1", "some type1" },
    { "some Id2", "some subject2", "some author2", "some type2" } };

您的程序如下所示:

import javax.swing.*;
import javax.swing.event.AncestorEvent;
import javax.swing.table.DefaultTableModel;

class Test {
    static String[][] arr = {
        { "some Id1", "some subject1", "some author1", "some type1" },
        { "some Id2", "some subject2", "some author2", "some type2" } };

    public static void main(String[] args) {
        JTable jTable1 = new javax.swing.JTable();
        String columns[]={"ID","Subject","Author","Type"};
        jTable1.setModel(new DefaultTableModel(arr,columns));
        jTable1.setName("jTable1"); // NOI18N

        jTable1.addAncestorListener(new javax.swing.event.AncestorListener() {
            public void ancestorMoved(AncestorEvent evt) {}
            public void ancestorAdded(AncestorEvent evt) {
                //jTable1AncestorAdded(evt);
            }
            public void ancestorRemoved(AncestorEvent evt) {}
        });

        JScrollPane jScrollPane1 = new JScrollPane();
        jScrollPane1.setViewportView(jTable1);

        JFrame f = new JFrame();
        f.setContentPane(jScrollPane1);
        f.pack();
        f.setVisible(true);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}