Java stringbuilder remove last character 2016-12-08 05:42
Using StringBuilder or StringBuffer is more efficient then String when you need append some strings. There is a problem when use them in loop. We have to remove the last character when end the loop. Today I will show you how to remove last character when you use StringBuilder or StringBuffer.
TODO We want split the sentence with ",".
When you use StringBuilder the code is like following. The sample code of StringBuffer is similar with StringBuilder. You have to count the length of StringBuilder and use subString method to get the string without last character.
public static void main(String[] args) {
String[] stringArray = "this is a sentence".split(" ");
StringBuilder sb = new StringBuilder();
for (String string : stringArray) {
sb.append(string).append(",");
}
System.out.println("result:" + sb.toString().substring(0, sb.toString().length() - 1));
}
Recommend to use StringJoiner (need JDK1.8+)
It is easy to use StringJoiner split the sentence with ",". The sample code is like following.
public static void main(String[] args) {
String[] stringArray = "this is a sentence".split(" ");
StringJoiner stringJoiner = new StringJoiner(",");
for (String string : stringArray) {
stringJoiner.add(string);
}
System.out.println("result:" + stringJoiner);
}