如何查找字符串对象在java中重复多少次？ [英] How to find how many times does a string object repeat in java?

问题描述

我必须使用String对象：

I have to String objects:

String first = "/Some object that has a loop in it object/";
String second = "object";

我需要做的是找到第二个对象在第一个对象中重复的次数，可以你能告诉我怎么做吗？

What I need to do is find how many times does the second object repeat in the first object, can you please show me how to do that?

推荐答案

最简单的方法是使用 indexOf 在循环中，每次找到单词时推进起始索引：

The simplest way is to use indexOf in a loop, advancing the starting index each time that you find the word:

int ind = 0;
int cnt = 0;
while (true) {
    int pos = first.indexOf(second, ind);
    if (pos < 0) break;
    cnt++;
    ind = pos + 1; // Advance by second.length() to avoid self repetitions
}
System.out.println(cnt);

如果一个单词包含自我重复，这将多次找到该单词。请参阅上面的评论以避免此类重复查找。

This will find the word multiple times if a word contains self-repetitions. See the comment above to avoid such "duplicate" finds.

演示想法。

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