java - 在数组java中搜索一个数字

Question

我的代码首先生成包含 100 个元素的数组，然后将随机生成的数字放入每个元素中。我正在尝试搜索一个数字，如果找到，打印出它的索引。我到目前为止的代码是:

import java.util.Scanner;

public class Lab01 
{

    public static void main(String[] args) 
    {
        int[] nums = new int[100];

        for (int i = 0; i < nums.length; i++)
        {
            nums[i] = (int)((Math.random() * 100) + 1);
            System.out.print(nums[i] + " , ");
        }
     System.out.println();
     Scanner input = new Scanner(System.in);
     int num;
     System.out.println("What number would you like to search for?");
     num = input.nextInt();
     boolean found = false;        
     for (int i = 0; i < nums.length; i++) 
        {
            if (num == nums[i]) 
            {              
               found = true;
               break;
            }

            if (found)
            {
                System.out.println("That number was found at index" + i);
                break;
            }
            else
            {
                System.out.println("That number was not found.");
                break;
            }
        }       
    }
}

我输入打印语句来查看值，因此我可以验证它是否正常工作，但它总是返回“未找到”。我在这里缺少什么？

Answer 1

尝试替换此 block ，请参阅底部的解释:

     for (int i = 0; i < nums.length; i++) 
    {
        if (num == nums[i]) 
        {              
           found = true;
           break;
        }

        if (found)
        {
            System.out.println("That number was found at index" + i);
            break;
        }
        else
        {
            System.out.println("That number was not found.");
            break;
        }

与:

 int i; // create this
 for ( i = 0; i < nums.length; i++)  // and remove int from for loop
    {
        if (num == nums[i]) 
        {              
           found = true;
           break;
        }
    }
        if (found)
        {
            System.out.println("That number was found at index " + i);
        }
        else
        {
            System.out.println("That number was not found.");
        }

解释:
将 for 循环 与 if 条件 并从中移除 break 语句并创建一个 int i = 0 在上面的 for 循环 之前。