Remove the last redundant comma when splicing a string in Java.

Remove the last redundant comma when splicing a string in Java.

When we traverse the concatenated string, an additional character (such as a comma) will be added)

The following three methods can be used to remove the remaining symbols:

String str [] = {"hello", "beijing", "world", "shenzhen"}; StringBuffer buf = new StringBuffer (); for (int I = 0; I <str. length; I ++) {buf. append (str [I]). append (",");} if (buf. length ()> 0) {// Method 1: substring System. out. println (buf. substring (0, buf. length ()-1); // Method 2: replace System. out. println (buf. replace (buf. length ()-1, buf. length (), ""); // method 3: deleteCharAt System. out. println (buf. deleteCharAt (buf. length ()-1 ));}