How to flip two words in a string, Java

Question

So say I have a string called x that = "Hello world". I want to somehow make it so that it will flip those two words and instead display "world Hello". I am not very good with loops or arrays and obviously am a beginner. Could I accomplish this somehow by splitting my string? If so, how? If not, how could I do this? Help would be appreciated, thanks!

Answer 1

1) split string into String array on space.

String myArray[] = x.split(" ");

2) Create new string with words in reverse order from array.

String newString = myArray[1] + " " + myArray[0];

Bonus points for using a StringBuilder instead of concatenation.

Answer 2

String abc = "Hello world";
String cba = abc.replace( "Hello world", "world Hello" );

abc = "This is a longer string. Hello world. My String";
cba = abc.replace( "Hello world", "world Hello" );

If you want, you can explode your string as well:

String[] pieces = abc.split(" ");
for( int i=0; i<pieces.length-1; ++i )
    if( pieces[i]=="Hello" && pieces[i+1]=="world" ) swap(pieces[i], pieces[i+1]);

There are many other ways you can do it too. Be careful for capitalization. You can use .toUpperCase() in your if statements and then make your matching conditionals uppercase, but leave the results with their original capitalization, etc.