Java StreamTokenizer commentChar()方法与示例
StreamTokenizer类commentChar()方法
commentChar()方法在java.io包中可用。
commentChar()方法用于告诉给定字符以单行注释开头。该StreamTokenizer避免了从注释字符到行尾的每个字符。
commentChar()方法是一个非静态方法,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。
在检查注释字符时,commentChar()方法不会引发异常。
语法:
public void commentChar(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
空隙commentChar的//(INT字符)的方法
//StreamTokenizer-
import java.io.*;
public class CommentChar {
public static void main(String[] args) {
String str = "Hi, This is a mathematical expression : " +
" 2 * 4 = 8" + "8 + 5 = 13";
try {
//实例化FileOutputStream和ObjectOutputStream-
FileOutputStream fos_stm = new FileOutputStream("D:\\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("D:\\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commentChar()方法是
//将注释字符设置为“:”":" it will
//遇到问题时评论:在str-
st.commentChar(':');
//在这里,我们开始考虑
//文件不为空
boolean end_of_file = false;
do {
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.");
}
} while (!end_of_file);
} catch (Exception ex) {
ex.printStackTrace();
}
}
}输出结果
< Found. word: Hi , Found. word: This word: is word: a word: mathematical word: expression End of File Found