package?迭代器; import?java.util.ArrayList; import?java.util.Collection; import?java.util.Iterator; import?集合測(cè)試.Student; public?class?IteratorDemo?{ ????public?static?void?main(String[]?args)?{ ????????//定義第一個(gè)小集合 ????????Collection?c1=new?ArrayList(); ????????//Student?類只有2個(gè)參數(shù)，String?name,int?age， ????????//創(chuàng)建學(xué)生類對(duì)象，添加參數(shù)。 ????????Student?s1=new?Student("流川楓",22); ????????Student?s2=new?Student("櫻木花道",20); ????????Student?s3=new?Student("大空翼",24); ????????Student?s4=new?Student("葛優(yōu)",33); ????????//把學(xué)生類添加到第一個(gè)小集合中 ????????c1.add(s1); ????????c1.add(s2); ????????c1.add(s3); ????????c1.add(s4); ???????? ????????//定義第二個(gè)小集合 ????????Collection?c2=new?ArrayList(); ????????//創(chuàng)建學(xué)生類對(duì)象，添加參數(shù)。 ????????Student?s5=new?Student("舒克",22); ????????Student?s6=new?Student("黑貓警長(zhǎng)",20); ????????Student?s7=new?Student("貝塔",24); ????????Student?s8=new?Student("葛優(yōu)",33); ????????//把學(xué)生類添加到第二個(gè)小集合中 ????????c2.add(s5); ????????c2.add(s6); ????????c2.add(s7); ????????c2.add(s8); ????????//創(chuàng)建大集合 ????????Collection?cc=new?ArrayList(); ????????//把兩個(gè)小集合添加到大集合中 ????????cc.add(c1); ????????cc.add(c2); ????????//創(chuàng)建迭代器遍歷大集合 ????????Iterator?it=cc.iterator(); ????????while(it.hasNext()){ ????????//得到小集合，下面就不能創(chuàng)建小集合的迭代器，咋整呢，大神們。 ????????Object?i=it.next(); ????????????System.out.println(i); ????????Iterator?it1=i.iterator();//就是這個(gè)方法下面有紅線，求指點(diǎn) ????????????} ????????System.out.println(); ????} }