跪求大神看看这个match方法为什么调用不成功？
public class GramAnalyse {
private String str = null;
private String currentToken;
private String[] Token;
private int tokenIndex = 0;
private enum tokenList{
//文件开始结束标识
EOF,
//标识符
IDENTIFIER,
//操作符
COLEQ,PLUS,
//数字
NUMBER,
//分隔符
SEMI,LBRACE,COMMA,RBRACE,
//关键字
OUT
}
GramAnalyse(String str){
this.str = str;
}
public void analyse(){
if (str!=null){
Token = str.split(" ");
}
currentToken = Token[tokenIndex];
if (currentToken=="EOF") this.match(tokenList.EOF);
stmtSequence();
//System.out.println("Successful File!");
}
private void stmtSequence(){
this.stmt();
while (currentToken=="SEMI"){
this.stmt();
}
}
private void stmt(){
if (currentToken=="IDENTIFIER"){
match(tokenList.IDENTIFIER);
match(tokenList.COLEQ);
exp();
}
else if (currentToken=="OUT"){
match(tokenList.OUT);
match(tokenList.LBRACE);
pl();
match(tokenList.RBRACE);
} else {
System.out.println(currentToken);
System.exit(-1);
}
}
private void exp(){
if(currentToken=="IDENTIFIER"){
match(tokenList.IDENTIFIER);
if (currentToken=="PLUS"){
match(tokenList.PLUS);
exp();
}
}
else if(currentToken=="NUMBER"){
match(tokenList.NUMBER);
if (currentToken=="PLUS"){
match(tokenList.PLUS);
exp();
}
}
else if(currentToken=="LBRACE"){
match(tokenList.LBRACE);
stmt();
match(tokenList.COMMA);
exp();
match(tokenList.RBRACE);
}
}
private void pl(){
exp();
while(currentToken=="COMMA"){
match(tokenList.COMMA);
exp();
}
}
private void match(tokenList currenttoken){
if (tokenIndex<Token.length){
switch(currenttoken){
case EOF:
if (currentToken=="EOF"){
tokenIndex++;
currentToken = Token[tokenIndex];
System.out.println(currentToken);
} else {
System.out.println("there is an error for EOF!");
}
break;
case IDENTIFIER:
if (currentToken=="IDENTIFIER"){
tokenIndex++;
currentToken = Token[tokenIndex];
} else {
System.out.println("there is an error for IDENTIFIER!");
}
break;
case OUT:
if (currentToken=="OUT"){
tokenIndex++;
currentToken = Token[tokenIndex];
} else {
System.out.println("there is an error for OUT!");
}
break;
case NUMBER:
if (currentToken=="NUMBER"){
tokenIndex++;
currentToken = Token[tokenIndex];
} else {
System.out.println("there is an error for NUMBER!");
}
break;
case COLEQ:
if (currentToken=="COLEQ"){
tokenIndex++;
currentToken = Token[tokenIndex];
} else {
System.out.println("there is an error for COLEQ!");
}
break;
case PLUS:
if (currentToken=="PLUS"){
tokenIndex++;
currentToken = Token[tokenIndex];
} else {
System.out.println("there is an error for PLUS!");
}
break;
case LBRACE:
if (currentToken=="LBRACE"){
tokenIndex++;
currentToken = Token[tokenIndex];
} else {
System.out.println("there is an error for LBRACE!");
}
break;
case RBRACE:
if (currentToken=="RBRACE"){
tokenIndex++;
currentToken = Token[tokenIndex];
} else {
System.out.println("there is an error for RBRACE!");
}
break;
case COMMA:
if (currentToken=="COMMA"){
tokenIndex++;
currentToken = Token[tokenIndex];
} else {
System.out.println("there is an error for SEMI!");
}
break;
case SEMI:
if (currentToken=="SEMI"){
tokenIndex++;
currentToken = Token[tokenIndex];
} else {
System.out.println("there is an error for SEMI!");
}
break;
default:
{
System.out.println("There is an error!");
System.exit(-1);
}
}
}
}
}
我明明已经写了方法，为什么不能掉用呢？ Java enum --------------------编程问答-------------------- while(currentToken=="COMMA"){
这一句没有进入吧。判断错了。 --------------------编程问答--------------------
对不起哈，忘了给你文本文档了，你看着这个给俺解一下呗，谢谢哈
EOF
IDENTIFIERwef COLEQ NUMBER SEMI
IDENTIFIER COLEQ NUMBER SEMI
IDENTIFIER COLEQqw NUMBER SEMI
IDENTIFIER COLEQ NUMBER SEMI
OUT LBRACE IDENTIFIER COMMA IDENTIFIER COMMA IDENTIFIER COMMA IDENTIFIER RBRACE
EOF
第一个EOF都没有进入，不知道为什么？ --------------------编程问答--------------------
import java.io.*;
public class Main {
public static void main(String[] args) {
try {
FileReader fr = new FileReader(new File("1.txt"));
BufferedReader br = new BufferedReader(fr);
String str;
while((str=br.readLine())!=null){
GramAnalyse ga = new GramAnalyse(str);
ga.analyse();
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e){
e.printStackTrace();
}
}
}
这个是main方法，您要是有时间帮俺调试下呗，嘿嘿，马上要去上课了，谢谢哈 --------------------编程问答-------------------- 因为你没有进入while循环，当然不会进入EOF了 --------------------编程问答--------------------
谢了，是因为判断String内容是否相等，用equals方法，一个低级错误。。。。 --------------------编程问答--------------------
equals不是== --------------------编程问答-------------------- ==,equals问题...
补充：Java , Java SE
