flow

题目介绍：类图：联系人对象类：package data_structure_curriculum_design.experiment5_mobile_phone_address_book_simulation;import net.sourceforge.pinyin4j.PinyinHelper;import net.sourceforge.pinyin4j.format.HanyuPinyinCaseType;import net.sourceforge.pinyin4

java.lang.IllegalArgumentException: Children: duplicate children added 异常Exception in thread "JavaFX Application Thread" java.lang.IllegalArgumentException: Children: duplicate children added: parent = Grid hgap=5.0, vgap=12.0, alignment=TOP_LEFT当我们试