好奇怪的错误，求大家帮我看看

Question

package storecrime;import java.util.ArrayList;import java.util.Arrays;import java.util.Iterator;import java.util.List;public class CrimeTest { public List CrimenameToSelect; public CrimeTest() { this.CrimenameToSelect=new ArrayList(); }public void CrimenameAdd() { crimename cn1=new crimename("乱扔垃圾","001",2); CrimenameToSelect.add(cn1); System.out.println("录入了罪名："+cn1.rank+"级"+cn1.ID+""+cn1.name); crimename cn2=new crimename("偷看室友洗澡","002",3); System.out.println("录入了罪名："+cn2.rank+"级"+cn2.ID+""+cn2.name);//很有可能错在这里 crimename[] crimename2= {new crimename("考查课作弊","003",1),new crimename("考试课作弊","004",5)}; CrimenameToSelect.addAll(Arrays.asList(crimename2)); crimename temp1=(crimename)CrimenameToSelect.get(2); crimename temp2=(crimename)CrimenameToSelect.get(3);名："+temp1.rank+"级"+temp1.ID+""+temp1.name+""+temp2.rank+"级"+temp2.ID+""+temp2.name); } public void testGet() { int size=CrimenameToSelect.size(); System.out.println("存入以下罪刑:"); for(int i=0;i<size;i++) { crimename cr=(crimename)CrimenameToSelect.get(i); System.out.println("罪刑："+cr.ID+":"+cr.name); } } public void testIterator() { Iterator it=CrimenameToSelect.iterator(); System.out.println("已存入以下罪刑(Iterator):"); while(it.hasNext()) { crimename cr3=(crimename)it.next(); System.out.println("罪刑："+cr3.ID+":"+cr3.name); } } public static void main(String[] args) { // TODO Auto-generated method stub CrimeTest ct1=new CrimeTest(); ct1.CrimenameAdd(); ct1.testGet(); ct1.testIterator(); }}//********************package storecrime;import java.util.HashSet;import java.util.Set;public class Crimer { String name; String ID; public Set Crimename; public Crimer() { this.name=name; this.ID=ID; this.Crimename=new HashSet(); } }//********************package storecrime;public class crimename { String name; String ID; int rank; public crimename(String name,String ID,int rank){ this.ID=ID; this.name=name; this.rank=rank; }}