这来自hackerank.com上的30天代码挑战。我已经找到了意外的解决方案，但是我不明白为什么。如果我不使用z = scan.nextLine（）;什么都不会保存到该变量。
import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
public class Solution {
public static void main(String[] args) {
int i = 4;
double d = 4.0;
String s = "HackerRank ";
Scanner scan = new Scanner(System.in);
/* Declare second integer, double, and String variables. */
int x;
double y;
String z;
/* Read and save an integer, double, and String to your
variables.*/
// Note: If you have trouble reading the entire String, please go
back and review the Tutorial closely.
x = scan.nextInt();
y = scan.nextDouble();
z = scan.nextLine();
z = scan.nextLine();
/* Print the sum of both integer variables on a new line. */
System.out.println(i + x);
/* Print the sum of the double variables on a new line. */
System.out.println(d + y);
/* Concatenate and print the String variables on a new line;
the 's' variable above should be printed first. */
System.out.println(s + z);
scan.close();
}
}
输入：
12 4.0 is the best place to learn and practice coding!
我的输出：
16 8.0 HackerRank
预期输出：
16 8.0 HackerRank is the best place to learn and practice coding!