I have a string like this:
"hello I am a example example"
I have get the last word of the string like this
String lasttWord = mystring.substring(mystring.lastIndexOf(" ")+1);
but I can´t split this because the word is repeated
How can I remove the last word only?
Split the string by space and rename the last word. Then using the StringBuilder concatenate them together back to your original String.
String str = "hello I am a example example"
String[] parts = str.split(" ");
parts[parts.length-1] = "moon";
System.out.println(parts[parts.length-1]);
StringBuilder sb = new StringBuilder();
for (int i=0; i<parts.length; i++) {
sb.append(parts[i]);
sb.append(" ");
}
str = sb.toString();
StringBuffer()?
If you are looking to remove the duplicates from your String and not sure of the positions of the duplicates occurrences then you can try using both a list (to maintain order) and a set (to remove duplicates).
You can then rebuilt your String using the list without duplicates.
Here is the code snippet:
public static void main (String[] args)
{
String str = "hello I am a example example";
String[] tokens = str.split(" ");
Set<String> set = new HashSet<>();
List<String> list = new ArrayList<>();
for(String token : tokens) {
if(!set.contains(token)) {
set.add(token);
list.add(token);
}
}
/* Print String */
for(int i = 0; i < list.size(); i++)
System.out.print(list.get(i) + " ");
}
Output:
hello I am a example
"example lala example"and"example example lala"?