這樣做的方法家族是：

Returns the index within this string of the first (or last) occurrence of the specified substring [searching forward (or backward) starting at the specified index].

String text = "0123hello9012hello8901hello7890";

String word = "hello";

System.out.println(text.indexOf(word)); // prints "4"

System.out.println(text.lastIndexOf(word)); // prints "22"

// find all occurrences forward

for (int i = -1; (i = text.indexOf(word, i + 1)) != -1; ) {

System.out.println(i);

} // prints "4", "13", "22"

// find all occurrences backward

for (int i = text.length(); (i = text.lastIndexOf(word, i - 1)) != -1; ) {

System.out.println(i);

} // prints "22", "13", "4"

總結

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