java - StringBuilder 在 Java 中追加到 for 循环中

Question

这个问题已经有答案了:

Scanner is skipping nextLine() after using next() or nextFoo()? (25 个回答)

已关闭 5 年前。

当我执行以下命令时:

static void Append() {
    StringBuilder sb = new StringBuilder();
    System.out.print("How many words do you want to append? ");
    int n = input.nextInt();
    System.out.println("Please type the words you want to append: ");
    for (int c = 1; c <= n; c++) {
        String str = input.nextLine();
        sb.append(str);
        System.out.print(" ");
    }
    System.out.print(sb);

}

假设我输入 3 个单词，那么计算机只允许我输入 2 个单词..

这是输出:

How many words do you want to append? 3
Please type the words you want to append: 
 I
 am
 Iam

还有，为什么单词前面有一个空格？打印函数位于输入函数之后。那么不应该是相反的吗？

Answer 1

您应该将 nextLine() 替换为 next()。

import java.util.Scanner;
public class Main
{
static void Append() {
    Scanner input = new Scanner(System.in);
StringBuilder sb = new StringBuilder();
System.out.print("How many words do you want to append? ");
int n = input.nextInt();
System.out.println("Please type the words you want to append: ");
String str = null;
for (int c = 0; c < n; c++) {
     str = input.next();
    sb.append(str +" " );

}
System.out.print(sb);
}
public static void main(String[] args) {
    System.out.println("Hello World");
    Append();
}
}