com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel这个缺少

evenlyu 2019-08-02 11:52:47

java.lang.ClassNotFoundException: com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:583)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:415)
at java.desktop/javax.swing.SwingUtilities.loadSystemClass(SwingUtilities.java:2036)
at java.desktop/javax.swing.UIManager.setLookAndFeel(UIManager.java:632)
at test.One.<init>(One.java:17)
at test.One.main(One.java:10)

新安装的jdk12，想试试换个皮肤，提示以上错误

附上代码：
public class One extends JFrame{

public static void main(String[] args)
{
new One();

}

One(){
try {
UIManager
.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
} catch (Exception e) {
e.printStackTrace();
}
this.setSize(1320, 750);
this.setVisible(true);
this.setLocationRelativeTo(null);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
}
}

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Franky ? 2020-02-29

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没导入这个jar包，建议设置idea自动下载jar包

evenlyu 2019-08-02

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想知道是什么错误，该如何修改，麻烦各位大神了

MyEclipse10.1破解补丁，解决Exception in thread "main" java.lang.ClassNotFoundException: com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel错误

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package com.Login; import java.awt.BorderLayout; import java.awt.Color; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.Graphics; import java.awt.GridLayout; import java.awt.Point; import java.awt.Rectangle; import java.awt.Toolkit; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.event.MouseMotionAdapter; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import javax.swing.BorderFactory; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JPasswordField; import javax.swing.JTextField; import javax.swing.UIManager; import com.jdbc.DB; import com.window.Main; public class Login extends JFrame { private JPanel contentPane; private Point pressedPoint; /*private final class LoginActionListener implements ActionListener { public void actionPerformed(ActionEvent e) { // 显示窗体的登录进度面板 getGlassPane().setVisible(true); } }*/ public static void main(String[] args) { try { UIManager .setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel"); } catch (Throwable e) { e.printStackTrace(); } EventQueue.invokeLater(new Runnable() { public void run() { try { Login frame = new Login (); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } public Login(){ super("登录"); addWindowListener(new WindowAdapter() { @Override public void windowOpened(WindowEvent e) { do_this_windowOpened(e); } }); setUndecorated(true); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setSize(380,280); setIconImage(new ImageIcon("image\\tubiao.png").getImage()); Dimension displaySize = Toolkit.getDefaultToolkit().getScreenSize(); Dimension frameSize=this.getSize(); setLocation((displaySize.width - frameSize.width) / 2+(frameSize.width)/2,(displaySize.height - frameSize.height) / 2); contentPane=new JPanel(); contentPane.setBorder(BorderFactory.createLineBorder(Color.BLACK)); //设置边框为无 contentPane.setLayout(new BorderLayout(0,0));//设置contentPane的布局 setContentPane(contentPane);// JPanel topPanel = new JPanel(){ public void paintComponent(Graphics g) { g.drawImage(new ImageIcon("image\\logintop1.jpg").getImage(), 0, 0,500,48, null); super.paintComponent(g); } };//标题栏panel topPanel.addMouseMotionListener(new MouseMotionAdapter() { @Override public void mouseDragged(MouseEvent e) { do_topPanel_mouseDragged(e); } }); topPanel.addMouseListener(new MouseAdapter() { @Override public void mousePressed(MouseEvent e) { do_topPanel_mousePressed(e); } }); topPanel.setOpaque(false);//设置背景透明 topPanel.setPreferredSize(new Dimension(500,30)); topPanel.setLayout(null); JPanel panel = new JPanel(); panel.setBounds(312, 0, 66, 15); panel.setOpaque(false); topPanel.add(panel); panel.setLayout(new GridLayout(1, 0, 0, 0)); JButton button = new JButton(""); button.setRolloverIcon(new ImageIcon("image\\button4.png")); button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { do_button_itemStateChanged(e); } }); button.setFocusPainted(false);// 取消焦点绘制 button.setBorderPainted(false);// 取消边框绘制 button.setContentAreaFilled(false);// 取消内容绘制 button.setIcon(new ImageIcon("image\\button4-1.png")); panel.add(button); JButton button_2 = new JButton(""); button_2.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { do_button_2_actionPerformed(e); } }); button_2.setRolloverIcon(new ImageIcon("image\\button3.png")); button_2.setFocusPainted(false); button_2.setContentAreaFilled(false); button_2.setBorderPainted(false); button_2.setIcon(new ImageIcon("image\\button3-1.png")); panel.add(button_2); contentPane.add(topPanel, BorderLayout.NORTH); JPanel backgroundPanel = new JPanel(){ public void paintComponent(Graphics g) { g.drawImage(new ImageIcon("image\\loginframe1.jpg").getImage(), 0, 0,500,300, null); super.paintComponent(g); } };//panel backgroundPanel.setLayout(new GridLayout(1,1)); backgroundPanel.setOpaque(false); JPanel panel1 = new JPanel() { public void paintComponent(Graphics g) { g.drawImage(new ImageIcon("image\\4.png").getImage(), 0, 0,420,200, null); super.paintComponent(g); } }; panel1.setLayout(null); panel1.setOpaque(false); JLabel label1=new JLabel("用户名："); JLabel label2=new JLabel("密码："); final JTextField text1=new JTextField(15); final JPasswordField text2=new JPasswordField(15); label1.setBounds(80,60,60,30); text1.setBounds(160, 60, 150,30); label2.setBounds(80,120,60,30); text2.setBounds( 160, 120, 150, 30); panel1.add(label1); panel1.add(text1); panel1.add(label2); panel1.add(text2); backgroundPanel.add(panel1); contentPane.add(backgroundPanel, BorderLayout.CENTER); JPanel panel2 =new JPanel(); //panel2.setPreferredSize(new Dimension(380,40)); panel2.setLayout(null); panel2.setOpaque(false); JButton button1=new JButton("登录"); JButton button2=new JButton("取消"); MouseAdapter mouseAdapter = new MouseAdapter() {// 创建鼠标事件监听器 private Rectangle sourceRec;// 创建矩形对象 @Override public void mouseEntered(MouseEvent e) { JButton button = (JButton) e.getSource();// 获取事件源按钮 sourceRec = button.getBounds();// 保存按钮大小 button.setBounds(sourceRec.x-5, sourceRec.y-5, sourceRec.width + 10, sourceRec.height + 10);// 把按钮放大 super.mouseEntered(e); } @Override public void mouseExited(MouseEvent e) { JButton button = (JButton) e.getSource();// 获取事件源按钮 if (sourceRec != null) {// 如果有备份矩形则用它恢复按钮大小 button.setBounds(sourceRec);// 设置按钮大小 } super.mouseExited(e); } }; button1.addMouseListener(mouseAdapter); button2.addMouseListener(mouseAdapter); button1.setBackground(new Color(154,216,230)); button2.setBackground(new Color(154,216,230)); //button1.setBorder(BorderFactory.createLineBorder(Color.blue) ); //button1.setBorder(new EmptyBorder(10, 0, 0, 0));// 顶部留白：40pix //button2.setBorder(new EmptyBorder(10, 0, 0, 0));// 顶部留白：40pix button1.setBounds(190, 9,70, 30); button2.setBounds(280, 9,70, 30); panel2.add(button1); panel2.add(button2); panel2.setBounds(0, 200, 380, 50); panel1.add(panel2); //button1.addActionListener( new LoginActionListener()); button1.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent event) { Connection con = null; PreparedStatement pstmt = null; ResultSet rs=null; Statement stmt=null; try{ con=DB.getConnection(); pstmt = con.prepareStatement("select *from tb_manager where id=? and password=?"); pstmt.setString(1, text1.getText()); pstmt.setString(2, text2.getText()); rs=pstmt.executeQuery(); JOptionPane pane=new JOptionPane(); if(rs.next()) { // new LoginActionListener(); pane.showMessageDialog(null, "登录成功！"); // new Main(); new Main(); dispose();// 销毁窗体 con.close(); } else if(text1.getText().equals("")||text2.getText().equals("")) { pane.showMessageDialog(null, " 登录失败！用户名或密码不能为空，请重新输入！"); text1.setText(""); text2.setText(""); } else { pane.showMessageDialog(null, "登录失败，你输入的用户名或密码错误,请重新输入！"); text1.setText(""); text2.setText(""); } }catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { DB.close(pstmt); DB.close(pstmt); } } } ); button2.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent event) { System.exit(0); } } ); } protected void do_button_itemStateChanged(ActionEvent e) { setExtendedState(JFrame.ICONIFIED);// 窗体最小化 } protected void do_button_2_actionPerformed(ActionEvent e) { dispose();// 销毁窗体 } protected void do_topPanel_mousePressed(MouseEvent e) { pressedPoint = e.getPoint();// 记录鼠标坐标 } protected void do_topPanel_mouseDragged(MouseEvent e) { Point point = e.getPoint();// 获取当前坐标 Point locationPoint = getLocation();// 获取窗体坐标 int x = locationPoint.x + point.x - pressedPoint.x;// 计算移动后的新坐标 int y = locationPoint.y + point.y - pressedPoint.y; setLocation(x, y);// 改变窗体位置 } protected void do_this_windowOpened(WindowEvent e) { final int height = getHeight();// 记录窗体高度 new Thread() {// 创建新线程 public void run() { Rectangle rec = getBounds(); for (int i = 0; i < 385; i += 10) {// 循环拉伸窗体 setBounds(rec.x - i / 2, rec.y, i, height);// 不断设置窗体大小与位置 try { Thread.sleep(15);// 线程休眠10毫秒 } catch (InterruptedException e1) { e1.printStackTrace(); } } } }.start();// 启动线程 } }

1、错误描述 C:\Users\Administrator.USER-0GUONPPBHK\Desktop>java -jar cracker.jar Exception in thread "main" java.lang.ClassNotFoundException: com.sun.java.swing. plaf.nimbus.NimbusLookAndFeel ...

run.bat闪退，电脑同存两个jdk

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