Question

    import java.util.Scanner;

    import java.util.Arrays;
    public class CarCareChoice{

    public static void main(String[] args) {
    String[] choices=new String[5];
    int j ;
    boolean validItem=false;
    double price=0.0;
    int p;
    String str;
    //When i'm entering services I'm getting 5.o for all services plz help
        String[] services={"Am","Bm","Cm","Dm","Em"};

    double prices[]={1.0,2.0,3.0,4.0,5.0};
 //Scanner
     Scanner input = new Scanner(System.in);


    System.out.println("enter");

      str= input.nextLine();
       for(j = 0; j < choices.length;j++){

     if(Arrays.asList(services).contains(str)){
       validItem=true;
       price=prices[j];
       }
       }
       if (validItem)
        System.out.println("service"+""+price);
       else
       System.out.println("Invalis enter");

    }

    }

输出

enter
Am
service5.0

输出

enter
Bm
service5.0

当我进入Am时我应该得到1.0“Bm 2.0等等但我只得到5.0

Answer 1

您宁愿改进代码，如下所示：

System.out.println("enter"); 
List<String> choiceList = Arrays.asList(services); 
str= input.nextLine(); 
int index = choiceList.indexOf(str);
if ( index!=-1 ) 
{
     price = prices[i];
     validItem = true;

}
if (validItem)
   System.out.println("service"+""+price);
else
   System.out.println("Invalis enter");

你不需要在for循环中执行此操作。因为当您将数组转换为列表时，只需找到索引。如果是-1，则它绝对不是有效项，否则返回该数组索引处的价格。 ArrayList在内部由数组支持。

Answer 2

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="widget" class="widget">
  <h1>THE IMAGE</h1>
</div>
<input type="hidden" name="img_val" id="img_val" value="" />

<div id="showImage">
  <img id="captured_img" src="" height="120" width="100" />
</div>
<input type="button" id="btnSave" value="Save PNG" />

如果可能，请使用import java.util.Arrays; class Main { public static final int INVALID_INDEX = -1; public static void main(String[] args) { String[] services={"Am","Bm","Cm","Dm","Em"}; double prices[]={1.0,2.0,3.0,4.0,5.0}; String input = "Em"; int index = Arrays.asList(services).indexOf(input); System.out.println((index!=INVALID_INDEX)? prices[index]+"":"invalid input"); } }。

对于每一项服务，我都得到相同的价格（输出）

2 个答案: