JAVA 词法分析程序（图形界面 版）

/* * To change this template, choose Tools | Templates * and open the template in the editor. */ /* * LexicalAnalysis.java * * Created on 2009-11-17, 8:50:09 */ /** * * @author Zhangwei */ import javax.swing.*; import java.awt.*; public class LexicalAnalysis_2 extends javax.swing.JFrame { /** Creates new form LexicalAnalysis */ public LexicalAnalysis_2() { initComponents(); setLocationRelativeTo(null); } /** 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. */ @SuppressWarnings("unchecked") // <editor-fold defaultstate="collapsed" desc="Generated Code"> private void initComponents() { jLabel1 = new javax.swing.JLabel(); jLabel2 = new javax.swing.JLabel(); jTextField1 = new javax.swing.JTextField(); jButton1 = new javax.swing.JButton(); jLabel3 = new javax.swing.JLabel(); jScrollPane1 = new javax.swing.JScrollPane(); jTextArea1 = new javax.swing.JTextArea(); jLabel4 = new javax.swing.JLabel(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); setTitle("词法分析程序（JAVA版） 2740610228 张伟 "); jLabel1.setFont(new java.awt.Font("微软雅黑", 1, 24)); jLabel1.setText("词法分析程序"); jLabel1.setName("jLabel1"); // NOI18N jLabel2.setFont(new java.awt.Font("微软雅黑", 1, 12)); jLabel2.setText("请输入你要分析的语句"); jLabel2.setName("jLabel2"); // NOI18N jTextField1.setName("jTextField1"); // NOI18N jButton1.setText("分析"); jButton1.setName("jButton1"); // NOI18N jButton1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton1ActionPerformed(evt); } }); jLabel3.setFont(new java.awt.Font("微软雅黑", 1, 12)); jLabel3.setText("语句分析结果如下"); jLabel3.setName("jLabel3"); // NOI18N jScrollPane1.setName("jScrollPane1"); // NOI18N jTextArea1.setColumns(20); jTextArea1.setRows(5); jTextArea1.setName("jTextArea1"); // NOI18N jScrollPane1.setViewportView(jTextArea1); jLabel4.setText("注：该词法分析程序是分析形如ABCabc123:=12.3+4.56的词法语句"); jLabel4.setName("jLabel4"); // NOI18N javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup() .addContainerGap(131, Short.MAX_VALUE) .addComponent(jLabel1) .addGap(125, 125, 125)) .addGroup(layout.createSequentialGroup() .addGap(23, 23, 23) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jLabel4) .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 332, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(jLabel3) .addGroup(layout.createSequentialGroup() .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 269, javax.swing.GroupLayout.PREFERRED_SIZE) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 75, javax.swing.GroupLayout.PREFERRED_SIZE)) .addComponent(jLabel2)) .addContainerGap(23, Short.MAX_VALUE)) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addContainerGap() .addComponent(jLabel1) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(jLabel2) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(jButton1)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(jLabel3) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 135, javax.swing.GroupLayout.PREFERRED_SIZE) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(jLabel4) .addContainerGap(13, Short.MAX_VALUE)) ); pack(); }// </editor-fold> String key[]={"begin","end","if","then","else","while","write","read","do", "call","const","char","until","procedure","repeat"};//关键字 boolean isKey(String s) { for(int a=0;a<=14;a++) { if(s.equals(key[a])) return true; } return false; } void Process(int a) { switch(a) { case 1: JOptionPane.showMessageDialog(null, "输入的语句为空"); break; case 2: JOptionPane.showMessageDialog(null, "错误！输入字符首字母为整数"); break; case 3: JOptionPane.showMessageDialog(null, "错误！赋值符或+不存在"); break; case 4: JOptionPane.showMessageDialog(null, "错误！赋值符:= +和.不能在文法的开头或者结尾出现"); break; case 5: JOptionPane.showMessageDialog(null, "错误！多次出现: = + 或."); break; case 6: JOptionPane.showMessageDialog(null, "错误！标示符不能为关键字"); break; case 7: JOptionPane.showMessageDialog(null, "错误！语句中出现其它符号"); break; case 8: JOptionPane.showMessageDialog(null, "错误！标示符中有.出现"); break; case 9: JOptionPane.showMessageDialog(null, "错误！赋值符后有字母出现"); break; case 10: JOptionPane.showMessageDialog(null, "错误！+出现在数字的首部或者尾部"); break; case 11: JOptionPane.showMessageDialog(null, "错误！+前多次出现."); break; case 12: JOptionPane.showMessageDialog(null, "错误！+后多次出现."); break; case 13: String s_0=jTextField1.getText(); int n=s_0.length(); int count_3=s_0.indexOf(":"); String s_3=s_0.substring(0, count_3); int count_4=s_0.indexOf(":", 0); String s_6=s_0.substring(count_4+2, n); int count_5=s_6.indexOf("+"); int count_6=s_6.length(); String s_7=s_6.substring(0, count_5); String s_8=s_6.substring(count_5+1,count_6 ); jTextArea1.setText("输入："+s_0+"\n"+"输出： 正确\n"+"标示符： "+s_3+"\n"+"赋值符： :=\n"+"运算符：+\n"+"无符号数1："+s_7+"\n"+"无符号数2："+s_8); break; default: {} } } voi