java 逆波兰算法

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
public class WordAnalysis extends JFrame{
FileInputStream fis;
	JFileChooser jfc;
	JButton jb1;
	JButton jb2;
        JButton jb3;
	final JTextArea jt1 = new JTextArea(15,35);
	final JTextArea jt2 = new JTextArea(15,35);
	/*关键字*/
	String key[] = {"if","then","else","while","do"};
	/* 定义分界符 */
	char border[] = { '+', '-', '*', '/', '>', '<', '=', '(', ')', ';' };
	String border1[]={ "+", "-", "*", "/", ">", "<", "=", "(", ")", ";" };
	/* 定义关系运算符 */
	public WordAnalysis(){
		init();
	}
	public void init(){
		this.setTitle("WordAnalysis @author xjp");
		this.setSize(450,650);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		jt1.setLineWrap(true);
		jt2.setLineWrap(true);
		//jt1 = new JTextArea(10,30);
		//jt2 = new JTextArea(10,30);
		jt1.setLineWrap(true);
		jt2.setLineWrap(true);
		JScrollPane scrol1 = new JScrollPane(jt1); 
		JScrollPane scrol2 = new JScrollPane(jt2); 
		 jb1 = new JButton("开始词法分析");
		 jb2 = new JButton("导入文件");
	       jb3 = new JButton("清除文本框");
		JPanel jp = new JPanel();
		jp.add(scrol1);
		jp.add(jb1);
		jp.add(jb2);
		jp.add(jb3);
		jp.add(scrol2);
		this.getContentPane().add(jp);
		this.setVisible(true);
            
             
		jb1.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent arg0) {
				analysis();
			}	
		});

		jb2.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent arg0) {
				try {
						jfc=new JFileChooser();//文件选择器
						jfc.showDialog(null, "文件选择");
						fis = new FileInputStream(jfc.getSelectedFile().toString());
						byte[] args = new byte[10000];
						int len=fis.read(args);
						System.out.println(new String(args,0,len));
						jt1.setText("");
						jt1.setText(new String(args,0,len));
				} catch (Exception e) {	
					e.printStackTrace();
				}
			}
		});
jb3.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent arg0) {
				jt1.setText("");
				jt2.setText("");
			}	
		});
}


	/**词法分析*/

	public void analysis(){
		if(jt2.getText()!=null){
			jt2.setText("结果如下:\n");
		}
		String text= jt1.getText();
		
String text1="";
int flag=1;
for(int i=0;i\n");
		return true;
		}
		    
		}
		   return false;
		}

public  boolean isNumber1(String s){
	if(s.equals(""))
		return false;
	if(s.matches("\\d")){
		jt2.append("< 1 , "+s+" >\n");
		return true;}
	if(s.charAt(0)!='0')
	if(s.matches("\\d*")){
		jt2.append("< 1 , "+s+" >\n");
		return true;
		}
	
   return false;
}
public boolean isNumber2(String s){
	if(s.equals(""))
		return false;
	if(s.charAt(0)=='0'){
		s=s.substring(1, s.length());
		if(s.matches("\\d")){
			jt2.append("< 2 , "+s+" >\n");
			return true;}
		if(s.charAt(0)!='0')
		if(s.matches("\\d*")){
			jt2.append("< 2 , "+s+" >\n");
			return true;
			}
	}
   return false;
}
public boolean isNumber3(String s){
	if(s.equals(""))
		return false;
	if(s.charAt(0)=='0'&&s.charAt(1)=='x'){
		s=s.substring(2, s.length());
	
			jt2.append("< 3 , "+s+" >\n");
			return true;
			}
	//}
   return false;
	}


public  boolean isBorder(String s){
   for(int i1=0;i1\n");
return true;
}
    
}
   return false;
}

 public boolean isIdentifier(String s) {
        //如果字符串为空或者长度为0，返回false
        if(s == null || s.length() == 0) {
            return false;
        }
        //字符串中每一个字符都必须是java标识符的一部分
        for(int i = 0; i < s.length(); i++){
            if (!Character.isJavaIdentifierPart(s.charAt(i))) {
                return false;
            }
        }
        jt2.append("< 0 , "+s+" >\n");
        return true;
    }


	public static void main(String []args){
		
		WordAnalysis wordAnalysis=new WordAnalysis();
	}


}