0916词法分析

package compileWork;

import java.util.ArrayList;

import java.util.Scanner;

public class compileWork_1

{

public static void main(String args[])

{

Scanner s=new Scanner(System.in);

System.out.println("please input code");

String scode=s.nextLine();

s.close();

ArrayList<String> arrayphrase=new ArrayList<String>();

for(int i=0;i<scode.length();i++)

{

char[] stemp=scode.substring(i, i+1).toCharArray();

char cword=stemp[0];

String sphrase="";

int flag=0;

while(i<scode.length()&&cword<='Z'&&cword>='A'||cword<='z'&&cword>='a'||cword>='0'&&cword<='9')

{

i++;

sphrase+=cword;

char[] cnextTemp=scode.substring(i,i+1).toCharArray();

cword=cnextTemp[0];

}

if(flag==1){

arrayphrase.add(sphrase);

sphrase="";

if(i<scode.length()&&cword=='<')

if(i<scode.length()&&i<scode.length()&&cword=='=')

{

i++;

sphrase+=cword;

}

if(i<scode.length()&&cword=='>')

arrayphrase.add(sphrase);

sphrase="";

if(i<scode.length()&&cword==':')

i++;

sphrase+=cword;

char[] cnextTemp=scode.substring(i,i+1).toCharArray();

cword=cnextTemp[0];

if(i<scode.length()&&i<scode.length()&&cword=='=')

}

if(i<scode.length()&&cword=='+')

if(i<scode.length()&&cword=='-')

if(i<scode.length()&&cword=='*')

if(i<scode.length()&&cword=='/')

if(i<scode.length()){

sphrase+=cword;

arrayphrase.add(sphrase);

}

for(int j=0;j<6;j++)

System.out.print(arrayphrase.get(j));

}

老师好 因为能力不足只完成了一半 过段时间会补交