为什么我不把输入作为下面程序的字符串输入

Question

Scanner keyboard = new Scanner(System.in);
//prompt the user input for a number
int a  = keyboard.nextInt();
//prompt the user input for a string
String str = keyboard.nextLine();

获取字符串输入

Answer 1

.nextLine()正在获得＆＃39; \ n＆＃39;字符尾随整数。通过在keyboard.nextLine()之后添加.nextInt()来解决此问题。如下：

Scanner keyboard = new Scanner(System.in);
// prompt the user input for a number
int a  = keyboard.nextInt();
// prompt the user input for a string
keyboard.nextLine(); // This captures the '\n' character trailing the integer
String str = keyboard.nextLine();