http://cafe.naver.com/79nana.cafe?iframe_url=/ArticleRead.nhn%3Farticleid=268 class Printer { synchronized void printChar(char ch) { for(int i=1; i<=10; i++) { System.out.print(ch); } } } class PrinterThread extends Thread { Printer ptr; char ch; PrinterThread(Printer ptr, char ch) { this.ptr = ptr; this.ch = ch; } public void run() { for(int i=1; i<=10; i++) { ptr.printChar(ch); System.o..