[book.interpark.com/product/BookDisplay.do?_method=detail&sc.prdNo=268649098&gclid=Cj0KCQiA88X_BRDUARIsACVMYD_EgPJiBYn7QGOpnAAB5PG4enQ4GLG4LNBz3DquMUEsDIbyhEeZ6WYaAgC1EALw_wcB] 이 책을 보는데 import javax.swing.*; import java.awt.FlowLayout; import swidgets.*; import nz.sodium.*; public class clearfield { public static void main(String[] args) { JFrame frame = new JFrame("clearfield"); frame.setDefaul..