StreamTokenizer類nextToken()方法
- nextToken() 方法可在
java.io
包。 - nextToken() 方法用於解析此 StreamTokenizer 的輸入流中的下一個標記,並在 ttype 字段中返回下一個標記的類型。
- nextToken() 方法是一個非靜態方法,它隻能通過類對象訪問,如果我們嘗試使用類名訪問方法,那麽我們將得到一個錯誤。
- nextToken() 方法可能在返回下一個令牌時拋出異常。
IOException:在執行過程中遇到任何輸入/輸出錯誤時可能會拋出此異常。
用法:
Public int nextToken();
參數:
- 它不接受任何參數。
返回值:
該方法的返回類型是int
,它獲取 ttype 字段的值(即下一個標記的類型)。
例:
// Java program to demonstrate the example
// of int nextToken() method of StreamTokenizer
import java.io.*;
public class NextToken {
public static void main(String[] args) {
String str = "Hi, This is a mathematical expression:\n" +
" 2 * 4 = 8" + "8 + 5 = 13";
try {
// Instantiates FileOutputStream and ObjectOutputStream
FileOutputStream fos_stm = new FileOutputStream("D:\\includehelp.txt");
ObjectOutputStream obj_out_stm = new ObjectOutputStream(fos_stm);
// By using writeUTF() method is to
// write the given string in the file
obj_out_stm.writeUTF(str);
obj_out_stm.flush();
// Instantiates FileOutputStream and ObjectOutputStream
ObjectInputStream obj_in_stm = new ObjectInputStream(new FileInputStream("D:\\includehelp.txt"));
// Instantiates StreamTokenizer and Reader
Reader reader = new BufferedReader(new InputStreamReader(obj_in_stm));
StreamTokenizer st = new StreamTokenizer(reader);
// Here, we are considering initially
// file is not empty
boolean end_of_file = false;
while (!end_of_file) {
// By using nextToken() method is to
// parse the next token from the stream
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();
}
}
}
輸出
= Found. word:Hi , Found. word:This word:is word:a word:mathematical word:expression :Found. number:2.0 * Found. number:4.0 = Found. number:88.0 + Found. number:5.0 = Found. number:13.0 End of File Found
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注:本文由純淨天空篩選整理自Preeti Jain大神的英文原創作品 Java StreamTokenizer nextToken() Method with Example。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。