java.util.scanner

问题 How do I use the useDelimiter() method of the Scanner class to use both the comma (,) and the new line character (\n) as delimiters? I am parsing some text from a csv file. 回答1: Scanner s = new Scanner("hello, world \n hello world"); s.useDelimiter(",|\\n"); while(s.hasNext()){ System.out.println(s.next()); } Output hello world hello world JavaDoc 回答2: How about useDelimiter(",|\\n"); 回答3: useDelimiter takes a regex pattern, so, it would be something like ",|\n" 回答4: Jigar is absolutely

问题 I'm trying to implement a rudimentary lexer. I'm stuck on the file parsing at the moment. public ArrayList<Token> ParseFile () { int lineIndex = 0; Scanner scanner = new Scanner(this.fileName); while (scanner.hasNextLine()) { lineIndex++; String line = scanner.nextLine(); if (line.equals("")) continue; String[] split = line.split("\\s"); for (String s : split) { if (s.equals("") || s.equals("\\s*") || s.equals("\t")) continue; Token token = new Token(s, lineIndex); parsedFile.add(token); } }

问题 I'm trying to implement a rudimentary lexer. I'm stuck on the file parsing at the moment. public ArrayList<Token> ParseFile () { int lineIndex = 0; Scanner scanner = new Scanner(this.fileName); while (scanner.hasNextLine()) { lineIndex++; String line = scanner.nextLine(); if (line.equals("")) continue; String[] split = line.split("\\s"); for (String s : split) { if (s.equals("") || s.equals("\\s*") || s.equals("\t")) continue; Token token = new Token(s, lineIndex); parsedFile.add(token); } }

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 4 years ago . Same as topic: How to set cursor at the beginning of the txt file in the java? (im using scanner class) 回答1: I think I interpreted the question wrong first. I guess you can use RandomAccessFile to do what you wish to do. Here is a simple snapshot of the code that would demonstrate

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 4 years ago . Same as topic: How to set cursor at the beginning of the txt file in the java? (im using scanner class) 回答1: I think I interpreted the question wrong first. I guess you can use RandomAccessFile to do what you wish to do. Here is a simple snapshot of the code that would demonstrate

问题 String s[]; System.out.println("Enter loop value"); int t = s.nextInt(); for(int i=0;i<t;i++) { str[i]=s.nextLine(); } while it reading it gives null pointer exception 回答1: What you need is something like this: Scanner s = new Scanner(System.in); System.out.println("Enter loop value"); int t = s.nextInt(); // read number of element s.nextLine(); // consume new line String str[] = new String[t]; for(int i=0;i<t;i++) { str[i]=s.nextLine(); } System.out.println(Arrays.toString(str)); Hope this

问题 String s[]; System.out.println("Enter loop value"); int t = s.nextInt(); for(int i=0;i<t;i++) { str[i]=s.nextLine(); } while it reading it gives null pointer exception 回答1: What you need is something like this: Scanner s = new Scanner(System.in); System.out.println("Enter loop value"); int t = s.nextInt(); // read number of element s.nextLine(); // consume new line String str[] = new String[t]; for(int i=0;i<t;i++) { str[i]=s.nextLine(); } System.out.println(Arrays.toString(str)); Hope this

问题 I have a problem with scanning Hebrew in Netbeans. I am trying to Scan the user's input and present in the Console, but it appears as Gibberish. My code is: public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.println("Please input:"); System.out.println("Your input is: " + input.next()); } and this is the Console: run: Please input: שלום Your input is: ���� BUILD SUCCESSFUL (total time: 3 seconds) The same exact code works perfectly on Eclipse. If I

问题 I am writing a java program that runs a loop and keeps asking the user for input. The program then does a bunch of things with the string, and asks for another string and repeats. The issue is that many strings are very similar, so i would like to populate the prompt with the input from the last time in the loop. For instance: If the user enters a value as follows: Enter the SKU Number: APE-6603/A ... Then the next time it asks for an SKU, it will wait till the user presses enter as normal,

问题 Why would the following code give me a runtime error? It gives me a NoSuchElementException when the method is called the second time. It works fine if I delete the call to stdin.close() , but then Eclipse gives a warning that the resource is not closed. Code: import java.util.Scanner; public class st { public static void main(String[] args) { System.out.println("First call"); getInt("Enter first int (1-10): "); System.out.println("Second call"); getInt("Enter second int (1-10): "); } /** *