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分享求救啊 ！！！！十万火急！！！！
小弟在做Java frame时候老是报空指针，而且还是同一个务必请各位大神帮帮忙！！！
public static void showCenter(JFrame frame, JDialog dialog) {
Dimension frameSize =new Dimension();
frameSize =frame.getSize();//这是错误所在地， frame是null
Point frameCoordinate = frame.getLocation();
Dimension dialogSize = dialog.getSize();
dialog.setLocation((frameSize.width - dialogSize.width) / 2
+ frameCoordinate.x, (frameSize.height - dialogSize.height) / 2
+ frameCoordinate.y);
dialog.setVisible(true);
}
public static void showCenter(JFrame frame, JDialog dialog) {
Dimension frameSize =new Dimension();
frameSize =frame.getSize();//这是错误所在地， frame是null
Point frameCoordinate = frame.getLocation();
Dimension dialogSize = dialog.getSize();
dialog.setLocation((frameSize.width - dialogSize.width) / 2
+ frameCoordinate.x, (frameSize.height - dialogSize.height) / 2
+ frameCoordinate.y);
dialog.setVisible(true);
}
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u012222188 2014-04-25
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我用断点找着空值真了 但不知道该怎么改
S117 2014-04-25
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代码太多了，空指针就弄点断点调试下呀！
一般异常都会报告在那发生的空指针，去那看看就知道了！
u012222188 2014-04-25
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package com.jiaotong.frame;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import com.jiaotong.contrl.ImageGetter;
import com.jiaotong.contrl.MenuFactory;
import com.jiaotong.contrl.WindowCenter;
/**
* 用户界面类--添加职员界面
*
*/
public class EmpAddingView extends JDialog {
/**
*
*/
private static final long serialVersionUID = 1L;
// 职员姓名
private JTextField txtName = null;
// 年龄
private JTextField txtAge = null;
//身份证号
private JTextField txtShenfenzhenhao = null;
//籍贯
private JTextField txtJiguan = null;
// 性别
private JComboBox cboSex = null;
// 职务
private JTextField txtPosition = null;
// 备注
private JTextArea txaRemark = null;
// 添加按钮
private JButton btnAdd = null;
// 关闭按钮
private JButton btnClose = null;
// 重置按钮
private JButton btnReset = null;
private MenuFactory frame;
/*public EmpAddingView( ) {
super();
try {
this.frame = frame;
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
init();
setVisible(true);
//WindowCenter.showCenter(this.frame);
} catch (Exception e) {
e.printStackTrace();
}
}
*/
public EmpAddingView(MenuFactory frame, String title) {
super(frame, title);
try {
this.frame = frame;
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
init();
//setVisible(true);
WindowCenter.showCenter(frame,this);
} catch (Exception e) {
e.printStackTrace();
}
}
private void init() throws Exception {
txtName = new JTextField();
txtAge = new JTextField();
cboSex = new JComboBox();
txtPosition = new JTextField();
txtShenfenzhenhao = new JTextField();
txtJiguan = new JTextField();
txaRemark = new JTextArea();
btnAdd = new JButton("添加");
btnClose = new JButton("关闭");
btnReset = new JButton("重置");
JLabel lblName = new JLabel("姓名:");
JLabel lblAge = new JLabel("年龄:");
JLabel lblSex = new JLabel("性别:");
JLabel lblPosition = new JLabel("职务:");
JLabel lblShenfenzhenhao = new JLabel("身份证号:");
JLabel lblJiguan = new JLabel("籍贯:");
JLabel lblRemark = new JLabel("备注:");
JScrollPane scp = new JScrollPane();
JLabel lblImg = new JLabel();
getContentPane().setLayout(null);
lblName.setBounds(20, 20, 50, 20);
add(lblName);
txtName.setBounds(70, 20, 100, 20);
add(txtName);
lblAge.setBounds(180, 20, 50, 20);
add(lblAge);
txtAge.setBounds(230, 20, 100, 20);
add(txtAge);
lblSex.setBounds(20, 50, 50, 20);
add(lblSex);
cboSex.addItem("男");
cboSex.addItem("女");
cboSex.setBounds(70, 50, 100, 20);
add(cboSex);
lblPosition.setBounds(180, 50, 50, 20);
add(lblPosition);
txtPosition.setBounds(230, 50, 100, 20);
add(txtPosition);
lblShenfenzhenhao.setBounds(15, 80, 100, 20);
add(lblShenfenzhenhao);
txtShenfenzhenhao.setBounds(70, 80, 100, 20);
add(txtShenfenzhenhao);
lblJiguan.setBounds(180, 80, 50, 20);
add(lblJiguan);
txtJiguan.setBounds(230, 80, 100, 20);
add(txtJiguan);
lblRemark.setBounds(20, 110, 50, 20);
add(lblRemark);
scp.getViewport().add(txaRemark);
scp.setBounds(20, 130, 150, 60);
add(scp);
lblImg.setIcon(ImageGetter.getIcon("Rose_SYSConfiguration" + File.separator
+ "img" + File.separator + "addemp.gif"));
lblImg.setBounds(200, 80, 100, 100);
add(lblImg);
btnAdd.setBounds(50, 200, 60, 20);
add(btnAdd);
btnReset.setBounds(145, 200, 60, 20);
add(btnReset);
btnClose.setBounds(235, 200, 60, 20);
add(btnClose);
txaRemark.setLineWrap(true);
txaRemark.setWrapStyleWord(true);
setSize(350, 260);
setModal(true);
setResizable(false);
btnReset.setActionCommand("btnReset");
btnClose.setActionCommand("btnClose");
btnAdd.setActionCommand("btnAdd");
/* 重置按钮事件处理 */
btnReset.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals("btnReset")) {
txtName.setText("");
txtAge.setText("");
txtPosition.setText("");
txtShenfenzhenhao.setText("");
txtJiguan.setText("");
txaRemark.setText("");
txtName.requestFocus();
}
}
});
/* 关闭按钮事件处理 */
btnClose.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals("btnClose")) {
dispose();
}
}
});
/* 添加按钮事件处理 */
btnAdd.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals("btnAdd")) {
dispose();
}
}
});
}
}
u012222188 2014-04-25
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package com.jiaotong.frame;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import com.jiaotong.contrl.ImageGetter;
import com.jiaotong.contrl.MenuFactory;
import com.jiaotong.contrl.WindowCenter;
public class EmpAddingView extends JDialog {
private static final long serialVersionUID = 1L;
// 职员姓名
private JTextField txtName = null;
// 年龄
private JTextField txtAge = null;
//身份证号
private JTextField txtShenfenzhenhao = null;
//籍贯
private JTextField txtJiguan = null;
// 性别
private JComboBox cboSex = null;
// 职务
private JTextField txtPosition = null;
// 备注
private JTextArea txaRemark = null;
// 添加按钮
private JButton btnAdd = null;
// 关闭按钮
private JButton btnClose = null;
// 重置按钮
private JButton btnReset = null;
private MenuFactory frame;
public EmpAddingView(MenuFactory frame, String title) {
super(frame, title);
try {
this.frame = frame;
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
init();
//setVisible(true);
WindowCenter.showCenter(frame,this);
} catch (Exception e) {
e.printStackTrace();
}
}
private void init() throws Exception {
txtName = new JTextField();
txtAge = new JTextField();
cboSex = new JComboBox();
txtPosition = new JTextField();
txtShenfenzhenhao = new JTextField();
txtJiguan = new JTextField();
txaRemark = new JTextArea();
btnAdd = new JButton("添加");
btnClose = new JButton("关闭");
btnReset = new JButton("重置");
JLabel lblName = new JLabel("姓名:");
JLabel lblAge = new JLabel("年龄:");
JLabel lblSex = new JLabel("性别:");
JLabel lblPosition = new JLabel("职务:");
JLabel lblShenfenzhenhao = new JLabel("身份证号:");
JLabel lblJiguan = new JLabel("籍贯:");
JLabel lblRemark = new JLabel("备注:");
JScrollPane scp = new JScrollPane();
JLabel lblImg = new JLabel();
getContentPane().setLayout(null);
lblName.setBounds(20, 20, 50, 20);
add(lblName);
txtName.setBounds(70, 20, 100, 20);
add(txtName);
lblAge.setBounds(180, 20, 50, 20);
add(lblAge);
txtAge.setBounds(230, 20, 100, 20);
add(txtAge);
lblSex.setBounds(20, 50, 50, 20);
add(lblSex);
cboSex.addItem("男");
cboSex.addItem("女");
cboSex.setBounds(70, 50, 100, 20);
add(cboSex);
lblPosition.setBounds(180, 50, 50, 20);
add(lblPosition);
txtPosition.setBounds(230, 50, 100, 20);
add(txtPosition);
lblShenfenzhenhao.setBounds(15, 80, 100, 20);
add(lblShenfenzhenhao);
txtShenfenzhenhao.setBounds(70, 80, 100, 20);
add(txtShenfenzhenhao);
lblJiguan.setBounds(180, 80, 50, 20);
add(lblJiguan);
txtJiguan.setBounds(230, 80, 100, 20);
add(txtJiguan);
lblRemark.setBounds(20, 110, 50, 20);
add(lblRemark);
scp.getViewport().add(txaRemark);
scp.setBounds(20, 130, 150, 60);
add(scp);
lblImg.setIcon(ImageGetter.getIcon("Rose_SYSConfiguration" + File.separator
+ "img" + File.separator + "addemp.gif"));
lblImg.setBounds(200, 80, 100, 100);
add(lblImg);
btnAdd.setBounds(50, 200, 60, 20);
add(btnAdd);
btnReset.setBounds(145, 200, 60, 20);
add(btnReset);
btnClose.setBounds(235, 200, 60, 20);
add(btnClose);
txaRemark.setLineWrap(true);
txaRemark.setWrapStyleWord(true);
setSize(350, 260);
setModal(true);
setResizable(false);
btnReset.setActionCommand("btnReset");
btnClose.setActionCommand("btnClose");
btnAdd.setActionCommand("btnAdd");
/* 重置按钮事件处理 */
btnReset.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals("btnReset")) {
txtName.setText("");
txtAge.setText("");
txtPosition.setText("");
txtShenfenzhenhao.setText("");
txtJiguan.setText("");
txaRemark.setText("");
txtName.requestFocus();
}
}
});
/* 关闭按钮事件处理 */
btnClose.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals("btnClose")) {
dispose();
}
}
});
/* 添加按钮事件处理 */
btnAdd.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals("btnAdd")) {
dispose();
}
}
});
}
}
u012222188 2014-04-25
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你好 我代码字数比较多 不知道该怎么上传 请指教一下
grapepaul 2014-04-25
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调用那边出了问题，传了null过来
