如何在Java中创建一个循环，检查单个扫描器行中的next（）

Question

System.out.print("Enter some stuff:");
    while (input.hasNext()){
        System.out.print(input.next()+ " ");
    }

Whenever this runs, it asks the user for input, then prints it all out. However, what I want, is a loop that will print out all of the tokens of a scanner. Then, it realizes there are no more tokens, and the loop exits.

Answer 1

Well, you'd want to read the tokens into an ArrayList , like this:

List<String> store = new ArrayList<String>();
// read them all in and add them to our list
while (input.hasNext())
    store.add(input.next());
// now print them all out
for (String s: store)
    System.out.print(s+ " ");

What this does is to read them all in, and put them into the ArrayList ; then, the reading loop exits when there's nothing more to read. After that, it prints them all out. I think this is what you have in mind. If you wanted to print them while you were adding them, then you could

List<String> store = new ArrayList<String>();
// read them all in and add them to our list
while (input.hasNext()) {
    String s = input.next();
    store.add(s);
    System.out.print(s+ " ");
}
for (String s: store) {
    // do whatever you like with them
}

Answer 2

Don't just copy, try to understand mate:

import java.io.*;
import java.util.StringTokenizer;

public class PrintStuff {

public static void main (String[] args) {
    System.out.print("Enter some shit seperated by space:");
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    String str=""; 
    try {
        str = br.readLine();
    } catch (IOException ioe) {
        System.out.println("IO error trying to read bitch!");
    }

    StringTokenizer st = new StringTokenizer(str);

    while (st.hasMoreElements()) {
        System.out.println(st.nextElement());
    }
}

}