问题描述

关于java swing 为什么界面空白

package com.bbm.view;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.HeadlessException;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import javax.swing.border.TitledBorder;

public class BookBorrow extends JFrame {

private static final long serivaVersionUID = 1L;private JPanel readerborrow_infoJPbookborrowJPbuttonJPreaderinfoJPreader_resultJP;private JScrollPane jscrollPane;private JTable jtable;private JLabel readeridJLreadernameJLreadertypeJLISBNJLbooktypeJLbooknameJLauthorJLpublishJLpublishdateJLprinttimeJLunitpriceJLnowdateJLoperatorJL;private JTextField readeridJTFreadernameJTFreadertypeJTFISBNJTFbooktypeJTFbooknameJTFauthorJTFpublishJTFpublishdateJTFprinttimeJTFunitpriceJTFnowdateJTFoperatorJTF;private JButton borrowJBcloseJB;public BookBorrow(){    setBounds(200200700700);    setTitle(""图书借阅"");    readerborrow_infoJP = new JPanel(new BorderLayout());    TitledBorder tb1 = new TitledBorder(""读者借阅信息"");    readerborrow_infoJP.setBorder(tb1);    readerinfoJP = new JPanel();    readeridJL = new JLabel(""读者编号:"");    readeridJL.setHorizontalAlignment(SwingConstants.CENTER);    readerinfoJP.add(readeridJL);    readeridJTF = new JTextField();    readeridJTF.setColumns(10);    readerinfoJP.add(readeridJTF);    readernameJL = new JLabel(""读者姓名:"");    readernameJL.setHorizontalAlignment(SwingConstants.CENTER);    readerinfoJP.add(readernameJL);    readernameJTF = new JTextField();    readernameJTF.setColumns(10);    readerinfoJP.add(readernameJTF);    readertypeJL = new JLabel(""读者类别:"");    readertypeJL.setHorizontalAlignment(SwingConstants.CENTER);    readerinfoJP.add(readertypeJL);    readertypeJTF = new JTextField();    readertypeJTF.setColumns(10);    readerinfoJP.add(readertypeJTF);    readerborrow_infoJP.add(readerinfoJPBorderLayout.NORTH);    reader_resultJP = new JPanel();    jscrollPane = new JScrollPane();    jscrollPane.setPreferredSize(new Dimension(400200));    jtable = new JTable();    jtable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);    jscrollPane.setViewportView(jtable);    reader_resultJP.add(jscrollPane);    readerborrow_infoJP.add(reader_resultJPBorderLayout.CENTER);    this.add(readerborrow_infoJPBorderLayout.NORTH);    bookborrowJP = new JPanel();    TitledBorder tb2 = new TitledBorder(""图书借阅"");    bookborrowJP.setBorder(tb2);    GridLayout gridLayout = new GridLayout(5 4 8 8);    bookborrowJP.setLayout(getLayout());    ISBNJL = new JLabel(""ISBN:"");    ISBNJL.setHorizontalAlignment(SwingConstants.CENTER);    bookborrowJP.add(ISBNJL);    ISBNJTF = new JTextField();    bookborrowJP.add(ISBNJTF);    booktypeJL = new JLabel(""类别:"");    booktypeJL.setHorizontalAlignment(SwingConstants.CENTER);    bookborrowJP.add(booktypeJL);    booktypeJTF = new JTextField();    bookborrowJP.add(booktypeJTF);    booknameJL = new JLabel(""书名:"");    booknameJL.setHorizontalAlignment(SwingConstants.CENTER);    bookborrowJP.add(booknameJL);    booknameJTF = new JTextField();    bookborrowJP.add(booknameJTF);    authorJL = new JLabel(""作者:"");    authorJL.setHorizontalAlignment(SwingConstants.CENTER);    bookborrowJP.add(authorJL);    authorJTF = new JTextField();    bookborrowJP.add(authorJTF);    publishJL = new JLabel(""出版社:"");    publishJL.setHorizontalAlignment(SwingConstants.CENTER);    bookborrowJP.add(publishJL);    publishJTF = new JTextField();    bookborrowJP.add(publishJTF);    publishdateJL = new JLabel(""出版日期:"");    publishdateJL.setHorizontalAlignment(SwingConstants.CENTER);    bookborrowJP.add(publishdateJL);    publishdateJTF = new JTextField();    bookborrowJP.add(publishdateJTF);    printtimeJL = new JLabel(""印刷次数:"");    printtimeJL.setHorizontalAlignment(SwingConstants.CENTER);    bookborrowJP.add(printtimeJL);    printtimeJTF = new JTextField();    bookborrowJP.add(printtimeJTF);    unitpriceJL = new JLabel(""单价:"");    unitpriceJL.setHorizontalAlignment(SwingConstants.CENTER);    unitpriceJTF = new JTextField();    bookborrowJP.add(unitpriceJTF);    nowdateJL = new JLabel(""当前日期:"");    nowdateJL.setHorizontalAlignment(SwingConstants.CENTER);    bookborrowJP.add(nowdateJL);    nowdateJTF = new JTextField();    bookborrowJP.add(nowdateJTF);    operatorJL = new JLabel(""操作人员:"");    operatorJL.setHorizontalAlignment(SwingConstants.CENTER);    bookborrowJP.add(operatorJL);    operatorJTF = new JTextField();    bookborrowJP.add(operatorJTF);    this.add(bookborrowJPBorderLayout.CENTER);    buttonJP = new JPanel();    borrowJB = new JButton(""借阅"");    closeJB = new JButton(""关闭"");    buttonJP.add(borrowJB);    buttonJP.add(closeJB);    this.add(buttonJPBorderLayout.SOUTH);    this.setVisible(true);    this.setResizable(false);}public static void main(String[] args) {    new BookBorrow();}

}

解决方案

java swing 登陆界面
java swing 界面风格
java swing 界面开发实战

解决方案二：
首先，你需要确定，窗体设置Size了么，其次控件都添加到this里面了么。
JProgressBar bar;
JLabel label;
int widthheight;
public IndexView()
{
label = new JLabel(new ImageIcon(""image/index/index.jpg""));

    bar = new JProgressBar();    bar.setStringPainted(true);    bar.setIndeterminate(false);    bar.setBackground(Color.darkGray);    this.add(labelBorderLayout.NORTH);    this.add(bar BorderLayout.SOUTH);    this.setSize(400 263);    width = Toolkit.getDefaultToolkit().getScreenSize().width;    height = Toolkit.getDefaultToolkit().getScreenSize().height;    this.setLocation(width/2-200 height/2-150);    this.setVisible(true);}