java - 打印与数组中的数字匹配的字符串

Question

我试图从字符串列表(数组)中仅取出一个与用户输入(数字)相对应的值。如果用户输入数字 4，结果应该是 60。这是我一直试图完成的代码。错误是 int 和 string 不兼容(当然)，但除此之外，我确信我在其他地方也犯了错误。我希望数组尽可能简单，没有对象和类。

import java.util.Scanner;
public class FindStringValue{
public static void main(String[] args){


  final int[] VALID_NUMBERS=new int[8];
  String[] someArray = {"20", "30", "40", "50", "60", "70", "80", "90"};

  int inputNumber;
  boolean foundIt=false;
  int x=0;

  Scanner in = new Scanner(System.in);
  System.out.print("Enter a number from 0-7 >> ");
  inputNumber = in.nextInt();

  for(x=0;x<VALID_NUMBERS.length;++x)
        if(x==(someArray[x])){
        foundIt=true;
        break;}
        System.out.println("The Number "+inputNumber+" corresponds to String  "+someArray[x]);

        }
              }

Answer 1

也许我误读了这个问题，但听起来你想要的是:

if(inputNumber >= 0 && inputNumber < someArray.length) {
  System.out.printf("The Number %d corresponds to String %s\n", inputNumber, someArray[inputNumber]);
} else {
  // you don't really show how you want to handle this case...
}

尚不清楚 VALID_NUMBERS 的用途。

编辑

我的意思是你应该完全替换 for 循环:

import java.util.Scanner;
public class FindStringValue {

  final String[] someArray = {"20", "30", "40", "50", "60", "70", "80", "90"};

  public static void main(String[] args) {

    Scanner in = new Scanner(System.in);
    System.out.print("Enter a number from 0-7 >> ");
    int inputNumber = in.nextInt();

    if(inputNumber >= 0 && inputNumber < someArray.length) {
      System.out.printf("The Number %d corresponds to String %s\n", inputNumber, someArray[inputNumber]);
    } else {
      // you don't really show how you want to handle this case...
    }
  }
}