Java StreamTokenizer quoteChar()方法与示例
StreamTokenizer类quoteChar()方法
quoteChar()方法在java.io包中可用。
quoteChar()方法表示此字符定界符(此StreamTokenizer中的字符串常量)的匹配对。当nextToken()method遇到字符串常量时,将ttype字段值设置为字符串定界符,并将sval字段设置为该字符串的内容。
当遇到字符串引号字符时,将识别由字符串引号字符组成的字符串,该字符串由其后的所有字符组成,直到下一次出现该相似的字符串引号char或行出口EOF。解析字符串时,转义序列“\n”,“\t”会被识别并更改为单个字符。
quoteChar()方法是一种非静态方法,只能通过类对象访问,如果尝试使用类名称访问该方法,则会收到错误消息。
quoteChar()方法在引号字符时不会引发异常。
语法:
public void quoteChar(int character);
参数:
int字符–表示字符。
返回值:
该方法的返回类型为void,不返回任何内容。
示例
//Java程序演示示例
//StreamTokenizer的voidquoteChar(intcharacter)方法的//
import java.io.*;
public class QuoteChar {
public static void main(String[] args) {
String str = "Hi, This is \n a mathematical expression :\n " +
" 2 * 4 = 8 " + "8 + 5 = 13";
try {
//实例化FileOutputStream和ObjectOutputStream-
FileOutputStream fos_stm = new FileOutputStream("C:\\Users\\Preeti Jain\\Desktop\\programs\\includehelp.txt");
ObjectOutputStream obj_out_stm = new ObjectOutputStream(fos_stm);
//通过使用writeUTF()方法是
//将给定的字符串写入文件
obj_out_stm.writeUTF(str);
obj_out_stm.flush();
//实例化FileOutputStream和ObjectOutputStream-
ObjectInputStream obj_in_stm = new ObjectInputStream(new FileInputStream("C:\\Users\\Preeti Jain\\Desktop\\programs\\includehelp.txt"));
//实例化StreamTokenizer和Reader-
Reader reader = new BufferedReader(new InputStreamReader(obj_in_stm));
StreamTokenizer st = new StreamTokenizer(reader);
//通过使用quoteChar()方法是
//将给定的char'8'表示为
//引用char-
st.quoteChar('8');
//在这里,我们开始考虑
//文件不为空
boolean end_of_file = false;
while (!end_of_file) {
//通过使用nextToken()方法是
//解析流中的下一个标记
int token = st.nextToken();
switch (token) {
case StreamTokenizer.TT_EOF:
System.out.println("End of File Found");
end_of_file = true;
break;
case StreamTokenizer.TT_EOL:
System.out.println("End of Line Found");
break;
case StreamTokenizer.TT_WORD:
System.out.println("word: " + st.sval);
break;
case StreamTokenizer.TT_NUMBER:
System.out.println("number: " + st.nval);
break;
default:
System.out.println((char) token + " Found.");
}
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
}输出结果
@ Found. word: Hi , Found. word: This word: is word: a word: mathematical word: expression : Found. number: 2.0 * Found. number: 4.0 = Found. 8 Found. + Found. number: 5.0 = Found. number: 13.0 End of File Found