indexOf查找字符串中单词的所有出现 [英] indexOf to find all occurrences of a word in a String

问题描述

我正在尝试使用indexOf查找句子中所有出现的字符"the".例如，如果句子是那天我去那边"，它应该返回3.

I'm trying to use indexOf to find all occurrences of the characters 'the' in a sentence. For example, if the sentence were "The other day I went over there", it should return 3.

我能够做到这一点，直到找到第一个索引为止，但是我不确定如何编写循环.我最初有一个for循环，用于搜索整个字符串，但它返回的是完整的字符串字符长度，而不是出现我指定的字符.我如何编写一个循环来查找单词的所有出现位置?谢谢.

I am able to do this up to the point where it finds the first index, but I'm unsure of how to write the loop. I originally had a for loop that searched the entire string, but it was returning the full string character length, instead of the occurrences of my specified character. How can I write a loop that will find all of the occurrences of the word? Thank you.

import java.util.Scanner;

public class TheFinder
{
    public static void main (String[] args)
    {
        String theString = "";
        Scanner enter = new Scanner(System.in);

        System.out.println("Please enter a sentence: ");
        theString = enter.nextLine();
        int counter2 = 0;
        theString.indexOf("the");

        if (theString.indexOf("the")!= -1)
        counter2++;



        System.out.printf("The characters 'the' were found %d times", counter2);
        System.out.println();

        System.out.println("This was programmed by -----");

推荐答案

您可以跟踪索引:

int index = theString.indexOf("the");
while(index >= 0) {
    index = theString.indexOf("the", index+1);
    counter2++;
}

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