Question

如何将输入结合在 while循环下？

 try {
  System.out.println("Keep selecting the ingrients that you want until you                 press (0)");
  int ingrientsID = Integer.parseInt(br.readLine());
  while (!"0".equals(ingrientsID )) {
  System.out.println("One more?");
  ingrientsID = Integer.parseInt(br.readLine());
  if (ingrientsID == 0) {
  break; 
  } 
  }

Answer 1

您正尝试执行以下操作：

int ingrientsID = Integer.parseInt(br.readLine());
while (ingrientsID != 0) {
    System.out.println("One more?");
    ingrientsID = Integer.parseInt(br.readLine());
    // no breaks needed for ingrientsID == 0 as loop condition will 
    // automatic stop iterate for ingrientsID == 0
    // do more stuffs
}

Answer 2

  boolean flag=true;

  System.out.println("Keep selecting the ingrients that you want until you                 press (0)");
  int ingrientsID = 0,temp=0;
  while (flag) {//until user enters 0  
  temp=Integer.parseInt(br.readLine());
  ingrientsID += temp;//to sum each input that you type
  if (temp==0) {//is user enters 0 then
  flag=false;
  }
  else
  System.out.println("One more?"); 
}
System.out.println("sum: "+ingrientsID);//final result

Answer 3

以下是代码和一些评论。

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
//import java.util.Scanner;

public class Ingredients {

    public static void main(String [] args)throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        //or Scanner scan = new Scanner(System.in);
        int ingredientID=0;
        int sumOfIngredients=0;


        System.out.println("Keep selecting the ingrients that you want until you press (0)");

        //use do while to make it run at least once
        do{
            //get input, add to sumofIngredients
            ingredientID=Integer.parseInt(br.readLine());
        //or ingredientID= scan.nextInt(); if you're using scanner

            //add the ingredient
            sumOfIngredients+=ingredientID;

       //I don't think you need to ask "one more?". 
//You have given the instruction (to keep selecting the ingredients till the user presses 0 )
        }while(ingredientID!=0);

            //print the ingredients!
        System.out.println("sum of ingredients: "+ sumOfIngredients);           
    }
}

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Java：组合while循环的输入

3 个答案: