Question

JAVA图形界面问题 貌似是容器嵌套出问题？？

编译无问题 运行之后 只有窗口
各个组件都没显示出来
里面是一片空白
求修正
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
class ChanPinChuKu extends JPanel {
JLabel number,name,amount,date,user,note,top;
JComboBox users;
JTextField number1,name1,amount1,date1,note1;
JPanel p1,p2;
JButton enter,cancle;
public void chanpin()
{
enter=new JButton("确定");
cancle=new JButton("取消");
p1=new JPanel();
p1.setLayout(new GridLayout(2,6));
p2=new JPanel();
p1.setBorder(BorderFactory.createTitledBorder("ok"));
top=new JLabel("请输入产品信息");
number=new JLabel("出库单号：");
name=new JLabel("产品名称：");
amount=new JLabel("数量：");
date=new JLabel("出库日期：");
user=new JLabel("操作员：");
note=new JLabel("备注：");
number.setHorizontalAlignment(JTextField.RIGHT);
name.setHorizontalAlignment(JTextField.RIGHT);
amount.setHorizontalAlignment(JTextField.RIGHT);
date.setHorizontalAlignment(JTextField.RIGHT);
user.setHorizontalAlignment(JTextField.RIGHT);
note.setHorizontalAlignment(JTextField.RIGHT);
number1=new JTextField(20);
amount1=new JTextField(20);
date1=new JTextField(20);
note1=new JTextField(20);
name1=new JTextField(20);
users=new JComboBox();
users.setSelectedIndex(0);
setLayout(new BorderLayout());
add(top,BorderLayout.NORTH);
add(p1,BorderLayout.CENTER);
add(p2,BorderLayout.SOUTH);
p1.add(number);p1.add(number1);p1.add(name);
p1.add(name1);p1.add(amount);p1.add(amount1);
p1.add(date);p1.add(date1);p1.add(user);
p1.add(users);p1.add(note);p1.add(note1);
p2.add(enter);p2.add(cancle);
}

public static void main(String[] args){
JFrame f=new JFrame();
ChanPinChuKu panel=new ChanPinChuKu();
f.add(panel);
f.setSize(800,700);
f.setVisible(true);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}

Answer 1

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;

class ChanPinChuKu extends JPanel implements ActionListener{
JLabel number, name, amount, date, user, note, top;
JComboBox users;
JTextField number1, name1, amount1, date1, note1;
JPanel p1, p2;
JButton enter, cancle;

public ChanPinChuKu() {
enter = new JButton("确定");
cancle = new JButton("取消");
cancle.addActionListener(this);
enter.addActionListener(this);
p1 = new JPanel();
p1.setLayout(null);
p2 = new JPanel();
p1.setBorder(BorderFactory.createTitledBorder("ok"));
top = new JLabel("请输入产品信息");
number = new JLabel("出库单号：");
name = new JLabel("产品名称：");
amount = new JLabel("数量：");
date = new JLabel("出库日期：");
user = new JLabel("操作员：");
note = new JLabel("备注：");
number.setHorizontalAlignment(JTextField.RIGHT);
name.setHorizontalAlignment(JTextField.RIGHT);
amount.setHorizontalAlignment(JTextField.RIGHT);
date.setHorizontalAlignment(JTextField.RIGHT);
user.setHorizontalAlignment(JTextField.RIGHT);
note.setHorizontalAlignment(JTextField.RIGHT);
number1 = new JTextField(20);
amount1 = new JTextField(20);
date1 = new JTextField(20);
note1 = new JTextField(20);
name1 = new JTextField(20);
users = new JComboBox();
users.addItem("jack");
users.addItem("lucy");
users.addItem("jime");
users.setSelectedIndex(0);
setLayout(new BorderLayout());
add(top, BorderLayout.NORTH);
add(p1, BorderLayout.CENTER);
add(p2, BorderLayout.SOUTH);
number.setBounds(20,60,70,40);
p1.add(number);
number1.setBounds(100,67,90,25);
p1.add(number1);
name.setBounds(206,60,70,40);
p1.add(name);
name1.setBounds(288,67,90,25);
p1.add(name1);
amount.setBounds(365,60,70,40);
p1.add(amount);
amount1.setBounds(445,67,90,25);
p1.add(amount1);
date.setBounds(20,140,70,40);
p1.add(date);
date1.setBounds(100,147,90,25);
p1.add(date1);
user.setBounds(206,140,70,40);
p1.add(user);
users.setBounds(288,147,90,25);
p1.add(users);
note.setBounds(365,140,70,40);
p1.add(note);
note1.setBounds(445,147,90,25);
p1.add(note1);
p2.add(enter);
p2.add(cancle);
}

public static void main(String[] args) {
JFrame f = new JFrame("产品出库");
ChanPinChuKu panel = new ChanPinChuKu();
f.add(panel);
f.setBounds(400,100,580,350);
f.setVisible(true);
f.validate();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource()==cancle){
System.exit(1);
}else if(e.getSource()==enter){
JOptionPane.showMessageDialog(this, "保存成功！");
}

}
}

Answer 2

请在main函数中
ChanPinChuKu panel = new ChanPinChuKu();
下面加入一句
panel.chanpin();//初始化你的界面元素

另外这句语句users.setSelectedIndex(0);报错，请先注释掉再运行！

Answer 3

把所有控件的visible属性设true;