JAVA初學者幫助需要在一個循環中字符串輸入

Question

即時在Java初學者，我有一個問題要做到： 問題提示用戶5次進入，股票的名稱，然後股價隨後的數股份擁有，我們應該計算所有股票價值的總和，我只用兩個提示使用循環編寫它，但我的問題是，在第二個提示時間循環跳過字符串輸入的第二個股票名稱，而不是提升浙江...波紋管是代碼：

import java.util.Scanner; 
public class test1 { 

    public static void main(String[] args) { 
     Scanner input = new Scanner(System.in); 
     double sharePrice =0,stockPrice = 0, temp = 0 ; 
     int i = 0; 
     double sum=0; 
     String name; 
     while (i < 2) { 
      System.out.println("Enter the Name of the Stock "); 
      name = input.nextLine(); 

      System.out.println("Enter the Share price "); 
      sharePrice = input.nextDouble(); 

      System.out.println("Enter the number of owned shares"); 
      int numberOfshares = input.nextInt(); 
      stockPrice = sharePrice * (double)(numberOfshares); 

      sum += stockPrice; 

      i++; 
     } 
     System.out.println("the total stockprice owned is: " + sum); 
    } 
} 

這是輸出我得到：

Enter the Name of the Stock 
    nestle 
    Enter the Share price 
    2 
    Enter the number of owned shares 
    4 


    Enter the Name of the Stock 
    Enter the Share price 

什麼使得輸入在第二個循環中跳過？

Answer 1

再次根據我的評論，問題是您的代碼在調用nextInt()或nextDouble()時不處理行尾（EOL）標記。

解決的辦法是讓你的int和double爲了吞下EOL令牌後使用input.nextLine()：

sharePrice = input.nextDouble(); 
input.nextLine(); // add this 

System.out.println("Enter the number of owned shares"); 
int numberOfshares = input.nextInt(); 
input.nextLine(); // add this 
stockPrice = sharePrice * (double)(numberOfshares); 

Answer 2

的問題是，上次你在第一次調用

int numberOfshares = input.nextInt(); 

循環迭代你的第一個傳遞迴車作爲下一個股票名稱。你也可以使用：

double sharePrice = Double.parseDouble(input.nextLine()); 

和

int numberOfshares = Integer.parseInt(input.nextLine()); 

Answer 3

讀股價和股數後，應讀出的換行符：

public static void main(String[] args) 
{ 
    Scanner input = new Scanner(System.in); 
    double sharePrice = 0, stockPrice = 0; 
    int i = 0; 
    double sum = 0; 
    String name; 
    while (i < 2) 
    { 
     System.out.println("Enter the Name of the Stock "); 
     name = input.nextLine(); 
     System.out.println("Enter the Share price "); 
     sharePrice = input.nextDouble(); 
     // Read out the newline character after the share price. 
     input.nextLine(); 
     System.out.println("Enter the number of owned shares"); 
     int numberOfshares = input.nextInt(); 
     // Read out the newline character after the number of shares. 
     input.nextLine(); 
     stockPrice = sharePrice * (double) (numberOfshares); 
     sum += stockPrice; 
     System.out.println(String.format("Name: %s, Price: %f, Shares: %d, Total: %f", 
             name, 
             sharePrice, 
             numberOfshares, 
             stockPrice)); 
     i++; 
    } 
    System.out.println("the total stockprice owned is: " + sum); 
} 

見上面註釋行：