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I was trying to make something then i couldn't write an if method with contains and replace method. What was i missing?

 import java.util.Scanner; public class replacesomething { public static void main(String[] args) { Scanner cumle = new Scanner(System.in); System.out.println("Enter the sentence u want to replace "); String str1 = cumle.next(); if (str1.contains("replace")) { str1.replace("replace", "Hi"); System.out.println("Replaced Sentence: " + str1); } else { System.out.println("Sentence doesn't contains that..."); } } }
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    Strings are immutable in Java. You can't change them. All methods that "modify" a String ... don't. They return a new one. Commented Apr 10, 2014 at 15:41

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Strings are immutable in Java; you can't edit them once created. Instead, the "replace" method returns an new string. If you assign str1 with the result of replace you will get the result you expect.

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Thank you i got it but if i write "replace and something else" it prints "Hi" only. How can i do it for one word instead of all sentence? I mean, I want to print "Hi and something else".
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Change the replace method call to:

str1 = str1.replace("replace", "Hi");

Since String are immutable, you need to reassign the result back to str1. It doesn't perform in-place replacement, rather it constructs and returns a new String object. the original String is unmodified.

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Thank you i got it but if i write "replace and something else" it prints "Hi" only. How can i do it for one word instead of all sentence? I mean, I want to print "Hi and something else".

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