静态方法中的变量

第二个方法里你的参数就是date啊
public static String format(Date date){ //这里有了
Date date = null; //这里又定义了

import java.awt.Dimension;
import java.awt.Toolkit;
import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.UIManager;/**
*
* @author rKF14912
*/
public class MainJFrame extends javax.swing.JFrame implements Runnable { /** Creates new form MainJFrame */
 public MainJFrame() {
 //设置标题
 super("jar包搜索class工具");
 //设置窗口居中显示
 Toolkit toolkit = this.getToolkit();
 Dimension dimension = toolkit.getScreenSize();
 double screenWidth = dimension.getWidth();
 double screenHeight = dimension.getHeight();
 this.setBounds((int)screenWidth/2 - 580/2, (int)screenHeight/2 - 220/2, 580, 220);
 this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 initComponents();
 } /** This method is called from within the constructor to
 * initialize the form.
 * WARNING: Do NOT modify this code. The content of this method is
 * always regenerated by the Form Editor.
 */
 // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
 private void initComponents() { jFileChooser1 = new javax.swing.JFileChooser();
 jPanel1 = new javax.swing.JPanel();
 jLabel1 = new javax.swing.JLabel();
 jLabel2 = new javax.swing.JLabel();
 classTextField = new javax.swing.JTextField();
 pahtTextField = new javax.swing.JTextField();
 jButton1 = new javax.swing.JButton();
 includeSubPathCheckBox = new javax.swing.JCheckBox();
 listCheckBox = new javax.swing.JCheckBox();
 searchButton = new javax.swing.JButton();
 jButton2 = new javax.swing.JButton();
 jScrollPane1 = new javax.swing.JScrollPane();
 resultTextArea = new javax.swing.JTextArea();
 statusPanel = new javax.swing.JPanel();
 statusLabel = new javax.swing.JLabel(); jFileChooser1.setFileSelectionMode(javax.swing.JFileChooser.DIRECTORIES_ONLY);
 jFileChooser1.setName("jFileChooser1"); // NOI18N setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
 setResizable(false);
 getContentPane().setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout()); jPanel1.setName("jPanel1"); // NOI18N
 jPanel1.setPreferredSize(new java.awt.Dimension(570, 228));
 jPanel1.setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout()); jLabel1.setFont(new java.awt.Font("新宋体", 0, 12));
 jLabel1.setText("类名称");
 jLabel1.setName("jLabel1"); // NOI18N
 jPanel1.add(jLabel1, new org.netbeans.lib.awtextra.AbsoluteConstraints(10, 10, -1, 20)); jLabel2.setFont(new java.awt.Font("新宋体", 0, 12));
 jLabel2.setText("路 径");
 jLabel2.setName("jLabel2"); // NOI18N
 jPanel1.add(jLabel2, new org.netbeans.lib.awtextra.AbsoluteConstraints(10, 40, -1, 20)); classTextField.setFont(new java.awt.Font("新宋体", 0, 12));
 classTextField.setText("请输入类名称,如:xxx.xxx.Xxx");
 classTextField.setName("classTextField"); // NOI18N
 jPanel1.add(classTextField, new org.netbeans.lib.awtextra.AbsoluteConstraints(60, 10, 510, -1)); pahtTextField.setFont(new java.awt.Font("新宋体", 0, 12));
 pahtTextField.setName("pahtTextField"); // NOI18N
 jPanel1.add(pahtTextField, new org.netbeans.lib.awtextra.AbsoluteConstraints(60, 40, 440, 20)); jButton1.setFont(new java.awt.Font("新宋体", 0, 12));
 jButton1.setText("浏览");
 jButton1.setName("jButton1"); // NOI18N
 jButton1.addActionListener(new java.awt.event.ActionListener() {
 public void actionPerformed(java.awt.event.ActionEvent evt) {
 jButton1ActionPerformed(evt);
 }
 });

jPanel1.add(jButton1, new org.netbeans.lib.awtextra.AbsoluteConstraints(510, 38, 60, -1)); includeSubPathCheckBox.setFont(new java.awt.Font("新宋体", 0, 12));
 includeSubPathCheckBox.setText("包含子目录");
 includeSubPathCheckBox.setName("includeSubPathCheckBox"); // NOI18N
 jPanel1.add(includeSubPathCheckBox, new org.netbeans.lib.awtextra.AbsoluteConstraints(60, 70, -1, -1)); listCheckBox.setFont(new java.awt.Font("新宋体", 0, 12));
 listCheckBox.setText("列出所有");
 listCheckBox.setName("listCheckBox"); // NOI18N
 jPanel1.add(listCheckBox, new org.netbeans.lib.awtextra.AbsoluteConstraints(160, 70, -1, -1)); searchButton.setFont(new java.awt.Font("新宋体", 0, 12));
 searchButton.setText("搜索");
 searchButton.setName("searchButton"); // NOI18N
 searchButton.addActionListener(new java.awt.event.ActionListener() {
 public void actionPerformed(java.awt.event.ActionEvent evt) {
 searchButtonActionPerformed(evt);
 }
 });
 jPanel1.add(searchButton, new org.netbeans.lib.awtextra.AbsoluteConstraints(440, 70, 60, -1)); jButton2.setFont(new java.awt.Font("新宋体", 0, 12));
 jButton2.setText("停止");
 jButton2.setName("jButton2"); // NOI18N
 jButton2.addActionListener(new java.awt.event.ActionListener() {
 public void actionPerformed(java.awt.event.ActionEvent evt) {
 jButton2ActionPerformed(evt);
 }
 });
 jPanel1.add(jButton2, new org.netbeans.lib.awtextra.AbsoluteConstraints(510, 70, 60, -1)); jScrollPane1.setName("jScrollPane1"); // NOI18N resultTextArea.setColumns(20);
 resultTextArea.setEditable(false);
 resultTextArea.setRows(5);
 resultTextArea.setName("resultTextArea"); // NOI18N
 jScrollPane1.setViewportView(resultTextArea); jPanel1.add(jScrollPane1, new org.netbeans.lib.awtextra.AbsoluteConstraints(60, 100, 510, -1)); statusPanel.setName("statusPanel"); // NOI18N
 statusPanel.setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout()); statusLabel.setFont(new java.awt.Font("新宋体", 0, 12)); // NOI18N
 statusLabel.setName("statusLabel"); // NOI18N
 statusPanel.add(statusLabel, new org.netbeans.lib.awtextra.AbsoluteConstraints(0, 0, 560, 20)); jPanel1.add(statusPanel, new org.netbeans.lib.awtextra.AbsoluteConstraints(10, 220, 560, 20)); getContentPane().add(jPanel1, new org.netbeans.lib.awtextra.AbsoluteConstraints(0, 0, 580, 240));
 jPanel1.getAccessibleContext().setAccessibleName(""); pack();
 }// </editor-fold>//GEN-END:initComponents private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton1ActionPerformed
 this.jFileChooser1.showOpenDialog(this.getComponent(0));
 File file = this.jFileChooser1.getSelectedFile();
 if(file != null){
 this.pahtTextField.setText(file.getPath());
 //this.statusLabel.setText("");
 }
 }//GEN-LAST:event_jButton1ActionPerformed private void searchButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_searchButtonActionPerformed
 Thread t = new Thread(this);
 t.start();
 jPanel1.updateUI();
 }//GEN-LAST:event_searchButtonActionPerformed private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton2ActionPerformed
 this.stop = true;
 }//GEN-LAST:event_jButton2ActionPerformed

/**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (Exception e) {
                    e.printStackTrace();
                    try {
                        UIManager.setLookAndFeel("com.sun.java.swing.plaf.motif.MotifLookAndFeel");
                    } catch (Exception e1) {
                        e1.printStackTrace();
                    }
                }
                new MainJFrame().setVisible(true);
            }
        });
    }    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JTextField classTextField;
    private javax.swing.JCheckBox includeSubPathCheckBox;
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JFileChooser jFileChooser1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JCheckBox listCheckBox;
    private javax.swing.JTextField pahtTextField;
    private javax.swing.JTextArea resultTextArea;
    private javax.swing.JButton searchButton;
    private javax.swing.JLabel statusLabel;
    private javax.swing.JPanel statusPanel;
    // End of variables declaration//GEN-END:variables
    private boolean includeSubPath = false;
    private boolean listPath = false;
    private boolean success = false;
    private boolean stop = false;
    private ClassLoader cld = null;

    public void run() {
        try {
            this.resultTextArea.setText("");
            this.success = false;
            this.stop = false;
            String path = this.pahtTextField.getText();
            if(path != null && path.trim().length() >0 && this.classTextField.getText().trim().length() > 0){
                includeSubPath = this.includeSubPathCheckBox.isSelected();
                listPath = this.listCheckBox.isSelected();
                this.searchFile(path);
                this.statusLabel.setText("完成");
                this.statusLabel.update(this.statusLabel.getGraphics());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }    public ClassLoader getLoader(URL[] urls) throws MalformedURLException {
        cld = new URLClassLoader(urls, null);
        return cld;
    }

private void searchFile(String path) {
 if(stop){
 return;
 }
 File file = new File(path);
 if (file.exists() && file.isDirectory()) {
 String[] files = file.list();
 for (int i = 0; i < files.length; i++) {
 if(stop){
 return;
 }
 try {
 if(files[i].lastIndexOf(".jar") == -1){
 continue;
 }
 File tempfile = new File(path + File.separator + files[i]);
 if(tempfile.isDirectory()){
 continue;
 }
 URL url = tempfile.toURI().toURL();
 this.statusLabel.setText("正在搜索 " + url.getFile());
 this.statusPanel.update(this.statusPanel.getGraphics());
 try {
 getLoader(new URL[]{url}).loadClass(this.classTextField.getText().trim());
 this.setResult(tempfile.getAbsolutePath());
 if(!listPath){
 this.statusLabel.setText("完成");
 this.statusPanel.update(this.statusPanel.getGraphics());
 success = true;
 break;
 }
 } catch (ClassNotFoundException ex1) {
 //忽略异常
 } catch (NoClassDefFoundError ex1) {
 //找到了类,加载错误
 this.setResult(tempfile.getAbsolutePath());
 if(!listPath){
 this.statusLabel.setText("完成");
 this.statusPanel.update(this.statusPanel.getGraphics());
 success = true;
 break;
 }
 } catch (UnsupportedClassVersionError ex1) {
 //找到了类,加载错误,版本号不支持
 this.setResult(tempfile.getAbsolutePath());
 if(!listPath){
 this.statusLabel.setText("完成");
 this.statusPanel.update(this.statusPanel.getGraphics());
 success = true;
 break;
 }
 }catch (Exception e3) {
 //找到了类,加载错误
 this.setResult(tempfile.getAbsolutePath());
 if(!listPath){
 this.statusLabel.setText("完成");
 this.statusPanel.update(this.statusPanel.getGraphics());
 success = true;
 break;
 }
 }
 } catch (MalformedURLException ex) {
 ex.printStackTrace();
 } }
 jPanel1.updateUI();
 //循环处理子目录
 if(includeSubPath && !success){
 for (int i = 0; i < files.length; i++) {
 File tempfile = new File(path + File.separator + files[i]);
 if(tempfile.isDirectory()){
 this.searchFile(path + File.separator + files[i]);
 }
 }
 }
 }
 } private void setResult(String path){
 String tempResult = this.resultTextArea.getText();
 if(tempResult == null || "".equals(tempResult)){
 tempResult = path;
 }else{
 tempResult = tempResult + "\n" + path;
 }
 this.resultTextArea.setText(tempResult);
 jPanel1.updateUI();
 }}

<?xml version="1.0" encoding="UTF-8" ?><Form version="1.3" maxVersion="1.7" type="org.netbeans.modules.form.forminfo.JFrameFormInfo">
 <NonVisualComponents>
 <Component class="javax.swing.JFileChooser" name="jFileChooser1">
 <Properties>
 <Property name="fileSelectionMode" type="int" value="1"/>
 <Property name="name" type="java.lang.String" value="jFileChooser1" noResource="true"/>
 </Properties>
 </Component>
 </NonVisualComponents>
 <Properties>
 <Property name="defaultCloseOperation" type="int" value="3"/>
 <Property name="resizable" type="boolean" value="false"/>
 </Properties>
 <SyntheticProperties>
 <SyntheticProperty name="formSizePolicy" type="int" value="1"/>
 </SyntheticProperties>
 <AuxValues>
 <AuxValue name="FormSettings_autoResourcing" type="java.lang.Integer" value="0"/>
 <AuxValue name="FormSettings_autoSetComponentName" type="java.lang.Boolean" value="true"/>
 <AuxValue name="FormSettings_generateFQN" type="java.lang.Boolean" value="true"/>
 <AuxValue name="FormSettings_generateMnemonicsCode" type="java.lang.Boolean" value="false"/>
 <AuxValue name="FormSettings_i18nAutoMode" type="java.lang.Boolean" value="false"/>
 <AuxValue name="FormSettings_layoutCodeTarget" type="java.lang.Integer" value="1"/>
 <AuxValue name="FormSettings_listenerGenerationStyle" type="java.lang.Integer" value="0"/>
 <AuxValue name="FormSettings_variablesLocal" type="java.lang.Boolean" value="false"/>
 <AuxValue name="FormSettings_variablesModifier" type="java.lang.Integer" value="2"/>
 <AuxValue name="designerSize" type="java.awt.Dimension" value="-84,-19,0,5,115,114,0,18,106,97,118,97,46,97,119,116,46,68,105,109,101,110,115,105,111,110,65,-114,-39,-41,-84,95,68,20,2,0,2,73,0,6,104,101,105,103,104,116,73,0,5,119,105,100,116,104,120,112,0,0,0,-17,0,0,2,68"/>
 </AuxValues> <Layout class="org.netbeans.modules.form.compat2.layouts.DesignAbsoluteLayout">
 <Property name="useNullLayout" type="boolean" value="false"/>
 </Layout>
 <SubComponents>
 <Container class="javax.swing.JPanel" name="jPanel1">
 <Properties>
 <Property name="name" type="java.lang.String" value="jPanel1" noResource="true"/>
 <Property name="preferredSize" type="java.awt.Dimension" editor="org.netbeans.beaninfo.editors.DimensionEditor">
 <Dimension value="[570, 228]"/>
 </Property>
 </Properties>
 <AccessibilityProperties>
 <Property name="AccessibleContext.accessibleName" type="java.lang.String" value=""/>
 </AccessibilityProperties>
 <Constraints>
 <Constraint layoutClass="org.netbeans.modules.form.compat2.layouts.DesignAbsoluteLayout" value="org.netbeans.modules.form.compat2.layouts.DesignAbsoluteLayout$AbsoluteConstraintsDescription">
 <AbsoluteConstraints x="0" y="0" width="580" height="240"/>
 </Constraint>
 </Constraints> <Layout class="org.netbeans.modules.form.compat2.layouts.DesignAbsoluteLayout">
 <Property name="useNullLayout" type="boolean" value="false"/>
 </Layout>
 <SubComponents>
 <Component class="javax.swing.JLabel" name="jLabel1">
 <Properties>
 <Property name="font" type="java.awt.Font" editor="org.netbeans.beaninfo.editors.FontEditor">
 
 </Property>
 <Property name="text" type="java.lang.String" value="类名称"/>
 <Property name="name" type="java.lang.String" value="jLabel1" noResource="true"/>
 </Properties>
 <Constraints>
 <Constraint layoutClass="org.netbeans.modules.form.compat2.layouts.DesignAbsoluteLayout" value="org.netbeans.modules.form.compat2.layouts.DesignAbsoluteLayout$AbsoluteConstraintsDescription">
 <AbsoluteConstraints x="10" y="10" width="-1" height="20"/>
 </Constraint>
 </Constraints>
 </Component>

<Container class="javax.swing.JScrollPane" name="jScrollPane1">
 <Properties>
 <Property name="name" type="java.lang.String" value="jScrollPane1" noResource="true"/>
 </Properties>
 <AuxValues>
 <AuxValue name="autoScrollPane" type="java.lang.Boolean" value="true"/>
 </AuxValues>
 <Constraints>
 <Constraint layoutClass="org.netbeans.modules.form.compat2.layouts.DesignAbsoluteLayout" value="org.netbeans.modules.form.compat2.layouts.DesignAbsoluteLayout$AbsoluteConstraintsDescription">
 <AbsoluteConstraints x="60" y="100" width="510" height="-1"/>
 </Constraint>
 </Constraints>
 <Layout class="org.netbeans.modules.form.compat2.layouts.support.JScrollPaneSupportLayout"/>
 <SubComponents>
 <Component class="javax.swing.JTextArea" name="resultTextArea">
 <Properties>
 <Property name="columns" type="int" value="20"/>
 <Property name="editable" type="boolean" value="false"/>
 <Property name="rows" type="int" value="5"/>
 <Property name="name" type="java.lang.String" value="resultTextArea" noResource="true"/>
 </Properties>
 </Component>
 </SubComponents>
 </Container>
 <Container class="javax.swing.JPanel" name="statusPanel">
 <Properties>
 <Property name="name" type="java.lang.String" value="statusPanel" noResource="true"/>
 </Properties>
 <Constraints>
 <Constraint layoutClass="org.netbeans.modules.form.compat2.layouts.DesignAbsoluteLayout" value="org.netbeans.modules.form.compat2.layouts.DesignAbsoluteLayout$AbsoluteConstraintsDescription">
 <AbsoluteConstraints x="10" y="220" width="560" height="20"/>
 </Constraint>
 </Constraints>
 <Layout class="org.netbeans.modules.form.compat2.layouts.DesignAbsoluteLayout">
 <Property name="useNullLayout" type="boolean" value="false"/>
 </Layout>
 <SubComponents>
 <Component class="javax.swing.JLabel" name="statusLabel">
 <Properties>
 <Property name="font" type="java.awt.Font" editor="org.netbeans.beaninfo.editors.FontEditor">
 
 </Property>
 <Property name="name" type="java.lang.String" value="statusLabel" noResource="true"/>
 </Properties>
 <Constraints>
 <Constraint layoutClass="org.netbeans.modules.form.compat2.layouts.DesignAbsoluteLayout" value="org.netbeans.modules.form.compat2.layouts.DesignAbsoluteLayout$AbsoluteConstraintsDescription">
 <AbsoluteConstraints x="0" y="0" width="560" height="20"/>
 </Constraint>
 </Constraints>
 </Component>
 </SubComponents>
 </Container>
 </SubComponents>
 </Container>
 </SubComponents>
</Form>--
MainJFrame.form

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静态方法中的变量

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