public class HIMSEmployeeSearch extends JPanel implements ActionListener{
public int IDint;
public int IDint2;
public String YH_Name;
public String SearchName;
public String Sex1;
public int age;
public String JG;
public String DZ;
public String phone;
public String bm;
public String zw;
public String gj;
public String E_Mail;
public String nowTime1; Label title=new Label("公司员工信息查询界面");
TextField Searchtext=new TextField (10); JButton updateButton1=new JButton("修改");
JButton SearchButton=new JButton("搜索");
JButton delButton2=new JButton("删除");
TextArea textarea=new TextArea();
JTable table=new JTable() ;Object a[][];public HIMSEmployeeSearch (){
setLayout(null); title.setFont(new java.awt.Font("SansSerif",1,30));
title.setForeground(Color.red);
add(title);
为什么我设置布局为null时,面板是一片空白呢?什么组件都没显示。注意:class类中是extends JPanel
public int IDint;
public int IDint2;
public String YH_Name;
public String SearchName;
public String Sex1;
public int age;
public String JG;
public String DZ;
public String phone;
public String bm;
public String zw;
public String gj;
public String E_Mail;
public String nowTime1; Label title=new Label("公司员工信息查询界面");
TextField Searchtext=new TextField (10); JButton updateButton1=new JButton("修改");
JButton SearchButton=new JButton("搜索");
JButton delButton2=new JButton("删除");
TextArea textarea=new TextArea();
JTable table=new JTable() ;Object a[][];public HIMSEmployeeSearch (){
setLayout(null); title.setFont(new java.awt.Font("SansSerif",1,30));
title.setForeground(Color.red);
add(title);
为什么我设置布局为null时,面板是一片空白呢?什么组件都没显示。注意:class类中是extends JPanel
永远不要忘了这句。
可不可以发表看看。package Ex5_6;
import java.*;
import java.awt.*;import javax.swing.*;public class Null extends JFrame {
private JLabel name1=new JLabel("学号");
private JLabel name2=new JLabel("系别");
private JLabel name3=new JLabel("地址");
private JLabel name4=new JLabel("姓名");
private JLabel name5=new JLabel("专业");
private JButton Btn1=new JButton("添加");
private JButton Btn2=new JButton("查询");
private JButton Btn3=new JButton("退出");
private JTextField t1=new JTextField();
private JTextField t2=new JTextField();
private JTextField t3=new JTextField();
private JTextField t4=new JTextField();
private JTextField t5=new JTextField();public Null(){
JPanel jp=(JPanel)this.getContentPane();
jp.setLayout(null);
name1.setBounds(20, 30, 60, 30);
name2.setBounds(20, 70, 60, 30);
name3.setBounds(20, 110, 60, 30);
name4.setBounds(160, 30, 60, 30);
name5.setBounds(160, 70, 60, 30); t1.setBounds(90, 30, 60, 30);
t2.setBounds(90, 70, 60, 30);
t3.setBounds(90, 110, 140, 30);
t4.setBounds(230, 30, 60, 30);
t5.setBounds(230, 70, 60, 30);
Btn1.setBounds(10, 210, 60, 30);
Btn2.setBounds(100, 210, 60, 30);
Btn3.setBounds(190, 210, 60, 30);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//设置缺省的关闭操作
}public static void main(String[] args) {
JFrame.setDefaultLookAndFeelDecorated(false);//是否设置与本地一样的样式
Null multifrm=new Null();
multifrm.setSize(500, 400);
multifrm.setLocation(400,400);
multifrm.setVisible(true);
multifrm.setTitle(" ");
}}
jp.add(name2);
jp.add(name3);
jp.add(name4);
jp.add(name5);
jp.add(t1);
jp.add(t2);
jp.add(t3);
jp.add(t4);
jp.add(t5);
jp.add(Btn1);
jp.add(Btn2);
jp.add(Btn3);
现在知道了,原来粗心少了这个。