用Java打印用户输入？

Question

Say I had the Scanner method, and I want to print the user input after that.

Take this code for instance:

    String randomWords;
    Scanner kb = new Scanner(System.in);

    System.out.print("Please enter two words separated: ");

    randomWords = kb.next();    
    System.out.println(randomWords);

And if the two separated words entered were

hello world

Only

hello 

is printed

Why is this? and how can I print both of the words with the space included?

Thank you.

Answer 1

Use Scanner#nextLine( ) instead,

This method returns the rest of the current line, excluding any line separator at the end.

randomWords = kb.nextLine();    

Scanner#next() reads the next complete token basing on the delimiter.

Finds and returns the next complete token from this scanner. A complete token is preceded and followed by input that matches the delimiter pattern

As default delimiter of the scanner is whitespace , you should explicitly define the delimiter for your scanner using Scanner#useDelimiter(str) . If you use \\n next line as delimiter your curretn code would work.

 Scanner kb = new Scanner(System.in).useDelimiter("\n");
    System.out.print("Please enter two words separated: "); 
    randomWords = kb.next();    
    System.out.println(randomWords);

Answer 2

使用Scanner.nextLine（）方法读取换行符（不包括在内）。

randomWords = kb.nextLine();

Answer 3

public static void main(String[] args) {
        String randomWords;
        Scanner kb = new Scanner(System.in);

        System.out.print("Please enter two words separated: ");

        randomWords = kb.nextLine(); 
        System.out.println(randomWords);
    }