为什么我没有得到我的字符串的位置？ [英] Why am I not getting the position of my string?

问题描述

我让用户输入5个单词，然后让他们在其中一个字符串中选择类型。如果他们输入其中一个字符串，它将输出它的位置。如果没有，那么它会说找不到的词。当我输入一个单词进行搜索时，它总是给我找不到单词。

我尝试了多种方式使用for循环和while循环，但我得到了相同的结果。



我是什么尝试过：

I have the user put in 5 words, then ask them to pick type in one of the strings. If they type in one of the strings it will output the position of it. If not then it will say "word not found". When I type in a word to search it always gives me "word not found".
I've tried multiple ways with a for loop and while loop, but I get the same result.

What I have tried:

import java.util.Scanner;
public class App {

    public static void main(String[] args) {
        String[] position = new String[5];
        Scanner scan = new Scanner(System.in);
        int i = 0;
        String word = "";
        String searchWord = "";
        boolean done = false;
        
        
        for(i = 0; i < position.length; i++)
        {
            System.out.print("Enter a word: ");
            word = scan.nextLine();
        }
//        System.out.println("Search a string:");
//        searchWord = scan.nextLine();
       
        
        while (!done)
        {
            System.out.println("Search a string:");
            searchWord = scan.nextLine();
        
            //if (word.contains(searchWord))
            if(word.equalsIgnoreCase(searchWord))
            {
                System.out.println(i);
                done = true;
            }
            else 
            {
                System.out.println("Word not found");
                break;
            }
        }
        /*for(i = 0; i < position.length; i++)
        {
            if (searchWord.contains(word))
            {
                System.out.println(position[i]);
            }    
            else 
            {
                System.out.println("Word not found");
                break;
            }
        } */ 
        
    }
    
}

推荐答案

您的原始输入只是一个单词，但我认为您应该在 String []位置数组中存储五个单词。然后，您需要将搜索词与数组中的每个条目进行比较，以便了解位置值是什么。类似于：

Your original input is only a single word, but I think you should be storing five words in the String[] position array. You then need to compare the search word with each entry in the array in order to tell what the position value is. Something like:

        for(i = 0; i < position.length; i++)
        {
            System.out.print("Enter a word: ");
            position[i] = scan.nextLine();
        }
//
// ...
//
        for(i = 0; i < position.length; i++)
        {
            if(position[i].equalsIgnoreCase(searchWord))
            {
                System.out.println("Word found at: " + i);
                break;
            }
        }
        if (i == position.length)
        {
            System.out.println("Word not found");
        }

您只是忘了给我们一个预期输出和实际输出的样本输入。

介于两者之间，使用调试器并检查所有内容是否符合预期



有一个工具可以让你看到你的代码正在做什么，它的name是调试器。它也是一个很好的学习工具，因为它向你展示了现实，你可以看到哪种期望与现实相符。

当你不明白你的代码在做什么或为什么它做它做的时候，答案就是答案是调试器。

使用调试器查看代码正在执行的操作。只需设置断点并查看代码执行情况，调试器允许您逐行执行第1行并在执行时检查变量。



调试器 - 维基百科，免费的百科全书 [ ^ ]

http://docs.oracle.com/javase/7/docs/technotes/tools/windows/jdb.html [ ^ ]

https://www.jetbrains.com/idea/help/debugging-your-first-java-application.html [ ^ ]

调试器在这里向您展示你的代码正在做，你的任务是与它应该做的事情进行比较。

调试器中没有魔法，它没有找到错误，它只是帮助你。当代码没有达到预期的效果时，你就会接近一个错误。

You only forgot to give us a sample input with expected output and actual output.
In between, use the debugger and check that everything is as you expect

There is a tool that allow you to see what your code is doing, its name is debugger. It is also a great learning tool because it show you reality and you can see which expectation match reality.
When you don't understand what your code is doing or why it does what it does, the answer is debugger.
Use the debugger to see what your code is doing. Just set a breakpoint and see your code performing, the debugger allow you to execute lines 1 by 1 and to inspect variables as it execute.

Debugger - Wikipedia, the free encyclopedia[^]
http://docs.oracle.com/javase/7/docs/technotes/tools/windows/jdb.html[^]
https://www.jetbrains.com/idea/help/debugging-your-first-java-application.html[^]
The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't find bugs, it just help you to. When the code don't do what is expected, you are close to a bug.

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