我如何使用 java 中的 indexOf 检查数组中的数据

Question

我是 java 的新手，我正在尝试使用 indexOf 检查一个人的名字是否以数组中的字母结尾，并输出一个与其押韵的单词。我哪里错了？例如Dean 以 "ean" 结尾，因此它与绿色押韵。谢谢大家

    String [] first = new String [3];
    first [0] = "eem";
    first [1] = "een";
    first [2] = "ean";

    for (int i = 0; i < first.length; i++) {

        if (first[i].indexOf(first.length) != -1){
            System.out.println("That rhymes with green");
        }
    }

Answer 1

要检查天气输入是否包含给定元素的任何数组，您应该收到 input 然后遍历您的数组以查看。例如

  String personname = "Dean";
  String [] first = new String [3];
    first [0] = "eem";
    first [1] = "een";
    first [2] = "ean";

    for (int i = 0; i < personname.length; i++) {    
        if (input.indexOf(first[i]) != -1){  // check my input matched
            System.out.println("That rhymes with green");
        }
    }

Answer 2

我已经在编译器上测试并运行它。这工作正常。如有任何问题，请发表评论。谢谢

import java.util.*;

public class HelloWorld
{

    public static void main(String []args)
        {
            String [] first = new String [3];
            first [0] = "eem";
            first [1] = "een";
            first [2] = "ean";

            /* I am trying to get the input from user here */

            String s;
            Scanner in = new Scanner(System.in);
            System.out.println("Enter the string:");
            s = in.nextLine();

            /* Now, String.indexOf(substring) will check the condition if the match happens it will print the output, if it doesn't it returns -1 */

            for (int i = 0; i <s.length(); i++) 
                {    
                    if (s.indexOf(first[i]) != -1)
                        { 
                            System.out.println("That rhymes with green");
                        }
                }

       }
}

Answer 3

你应该使用 endsWith instead of indexOf。 indexOf 将 return 传递的字符串与当前字符串完全匹配的索引，顾名思义，endsWith 将检查当前字符串是否以传递的字符串结尾。

看看下面的代码：

String personName = "Dean";
String[] suffix = {"eem", "een", "ean"};
String[] names = {"greem", "green", "grean"};

for(int i = 0; i < suffix.length; i++) {
    if (personName.endsWith(suffix[i])){
        System.out.println("That rhymes with " + names[i]);
    }
}

此外，理想情况下，您希望保留 suffix -> name 的地图以便于维护，但对于 simplicity/exploring 这应该没问题。

我如何使用 java 中的 indexOf 检查数组中的数据

how do i check the data in an array with indexOf in java

java

arrays

indexof