To check if string contains particular word

Question

So how do you check if a string has a particular word in it?

So this is my code:

a.setOnClickListener(new View.OnClickListener() {

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Answer 1

   String sentence = "Check this answer and you can find the keyword with this code";
    String search = "keyword";

Compare the line of string in given string

if ((sentence.toLowerCase().trim()).equals(search.toLowerCase().trim())) {
System.out.println("not found");
}
else {  
    System.out.println("I found the keyword"); 
}