non-printing-characters

问题 I want to serialize the Arraylist of type ArrayList<Class> and the class contains two Arraylist of primitive type public class Keyword { private long id; private long wid; private String name; private ArrayList<Integer> rank; private int month; private float avg; private ArrayList<String> date; ... and so on } How can i do that? Lots of thanks in advance 回答1: If you want to use Serializable, you should have no problems, because ArrayList is Serializable just as String and every primitive type

问题 I've already wasted a good amount of time dealing with strings (generated by some other source) and I found out that the problem was that the strings have non-printable characters. Today I am dealing with javascript. Does anyone know how to replace non-printable unicode characters in javascript? I found something similar here: How can I replace non-printable Unicode characters in Java? my_string.replaceAll("\\p{C}", "?"); and here: Non-ascii characters added form input only with Safari

问题 Does anyone knows how to detect printable characters in java? After a while ( trial/error ) I get to this method: public boolean isPrintableChar( char c ) { Character.UnicodeBlock block = Character.UnicodeBlock.of( c ); return (!Character.isISOControl(c)) && c != KeyEvent.CHAR_UNDEFINED && block != null && block != Character.UnicodeBlock.SPECIALS; } I\'m getting the input via KeyListener and come Ctr-\'key\' printed an square. With this function seems fairly enough. Am I missing some char