Checking string inside string

Question

How to know if a specific text is contained in a string?

example:

String str = " Hello Word";

How do I check if the word "Hello" is contained in that string "str".

And if the check is true, how do you edit it.

In case there is the word "Hello" in string "str" then the word "Hello" will be changed to "Hello"

Answer 1

To check use the method contains() and to exchange use the replace().

String str = " Hello Word";
if (str.contains("Hello")) {
    str = str.replace("Hello", "Olá"); //note que é necessário reatribuir a variável
}

Or optimized:

String str = " Hello Word";
str = str.replace("Hello", "Olá");

Behold working in the ideone. And in the repl it.. Also put on the Github for future reference.

After all, if you don’t have it, you won’t make the switch. I made the first one to meet what you asked for, you might want to meet the contains().