javaweb项目视频-javase笔记1802.list子接口

1、知识点 子接2、具体packageimportimportpublicpackageimportimportpublicclassTestDemopublicstaticvoidmain(String[]{List<String>all=ArrayList<String>();o")o"all.add("World")all.add("nihao")}这个时候就可以使用List扩充Collection接口得到的get()方法。packageimportimportpublicclassTestDemopublicstaticvoidmain(String[]{List<String>all=newArrayList<String>(); o"); oall.add("World")all.add("nihao")for(intx=0;x<all.size();x++)Stringstrall.get(x}get()List接口中最为重要的一个特点。packageimportimportpublicclassTestDemopublicstaticvoidmain(String[]{List<String>all=newArrayList<String>(); o"); oall.add("World")all.add("nihao");all.remove("nihao");packageimportimportclassBookprivateStringtitleprivatedoublepricepublicBook(Stringtitle,doubleprice)this.title=titlethis.price=price}publicStringtoString()return"书名：this.title价格：this.price+"\n"}}publicpublicclassTestDemopublicstaticvoidmain(String[]List<BookallnewArrayList<Book>all.add(newBook("Java开发",79.8));all.add(newBook("JSP开发",69.8all.add(newBook("Oracle开发",89.8}}常操作，必须要覆写Object类中的equals()方法。packagepackageimportimportclassBookprivateStringtitleprivatedoublepricepublicBook(Stringtitle,doubleprice)this.title=titlethis.price=price}publicbooleanequals(Objectobj)if(this==obj)returntrue}if(obj==null)returnfalse}if(!(objinstanceofBook))returnfalse}Bookb=(Book)objif(b.title.equals(this.title)&&b.pricethis.price)returntrue}returnfalse}publicStringtoString()returnreturn"书名：this.title价格：this.price+"\n"}}publicclassTestDemopublicstaticvoidmain(String[]List<BookallnewArrayList<Book>all.add(newBook("Java开发",79.8));all.add(newBook("JSP开发",69.8all.add(newBook("Oracle开发",89.8all.remove(newBook("JSP开发",69.8}}以后一定要知道，在使用List接，对于remove()和contais()两个方法，必须要有publicpublicclassTestDemopublicstaticvoidmain(String[]args)List<BookList<BookallnewVector<Bookall.add(newBook("Java开发",79.8));all.add(newBook("JSP开发",69.8all.add(newBook("Oracle开发",89.8all.remove(newBook("JSP开发",69.8