第二个字符串 sq 可以使用 JAVA 打印相同的变量吗？

Question

我想打印一个由两个字符串连接而成的字符串：第一个是 declares；第二个是通过nextLine()输入的。当我以一个 space 作为输入输入两个字符串时，此代码有效，但当我尝试输入一个句子时，它不起作用。

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 iq;
        double dq;
        String sq;

        iq=scan.nextInt();
        dq=scan.nextDouble();
        sq= scan.nextLine();


        /* 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.

        /* Print the sum of both integer variables on a new line. */
        System.out.println(i+iq);
        System.out.println(d+ dq);
        s= s.concat(sq);
        System.out.println(s);

        /* Print the sum of the double variables on a new line. */

        /* Concatenate and print the String variables on a new line; 
            the 's' variable above should be printed first. */

        scan.close();
    }
}

Answer 1

首先，上面提到的代码不适用于任何字符串或句子。已知问题是，当您在 Scanner.next() 或任何 Scanner.nextFoo 方法之后使用 Scanner.nextLine 时，扫描仪将无法正常工作。

解决方法：

在 scan.nextDouble()

之后添加 Scan.nextLine()

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 iq;
        double dq;
        String sq;

        iq=scan.nextInt();
        dq=scan.nextDouble();
        scan.nextLine();
        sq= scan.nextLine();



        /* 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.

        /* Print the sum of both integer variables on a new line. */
        System.out.println(i+iq);
        System.out.println(d+ dq);
        s= s.concat(sq);
        System.out.println(s);

        /* Print the sum of the double variables on a new line. */

        /* Concatenate and print the String variables on a new line; 
            the 's' variable above should be printed first. */

        scan.close();
    }
}

第二个字符串 sq 可以使用 JAVA 打印相同的变量吗？

Can the second string sq be printed with same variable using JAVA?

java

string-concatenation