Modifying function fails to print expected result

Chao, I would like to modif开发者_StackOverflow中文版y a variable then get its value after the modifying function but why I get unexpected result.

String value="I miss the messenger";
public void func(String value)
{
   value.replace("miss","kiss");
}
/// print it
Writeline(value);

Thank you

The string you pass isn't modified (Strings are immutable in Java). Thus the replace(...) method will return a modified version of the original string, which you will have to pass around, otherwise it gets lost.

Change it to:

public String func(String value)
{
  return value.replace("miss","kiss");
}

String value="I miss the messenger";
value = func(value);
Writeline(value);

Java strings are immutable, hence replace creates a new string which must be assigned, e.g.,

value = value.replace("miss", "kiss");

Your function should return a string and you should printoiut what`s return

public String func(String value)
{
  return value.replace("miss","kiss");
}

String value="I miss the messenger";

/// print it
Writeline(func(value));