題目描述題目來源及自己的思路我的程序里聲明了一個TreeSet對象ts，寫了一個學(xué)生類，當(dāng)學(xué)生的年齡和姓名相同時被認(rèn)為是相同元素。在ts中添加了第一個學(xué)生對象與最后一個學(xué)生對象時，使這倆個學(xué)生對象的姓名和年齡相同，打印結(jié)果發(fā)現(xiàn)這倆個元素均被輸出，ts大小為4。相關(guān)代碼importjava.util.TreeSet;publicclassTreeSetDemo{publicstaticvoidmain(String[]args){TreeSetts=newTreeSet();ts.add(newStudent("lisi02",22));ts.add(newStudent("lisi01",40));ts.add(newStudent("lisi08",19));ts.add(newStudent("lisi02",22));//thefirstelementandthelastoneareaddedtots//However,tsbelongstoaSetCollection.//SoIthinkthelastoneshouldnotbeaddedtots.//whenthesecondelementisannotated,thelastonecannotbeadded.//Canyouexplainwhy?for(Studente:ts){System.out.println(e.getName()+"\t...\t"+e.getAge());}System.out.println(ts.size());}}classStudentimplementsComparable{privateStringname;privateintage;Student(Stringname,intage){this.name=name;this.age=age;}publicStringgetName(){returnname;}publicintgetAge(){returnage;}publicintcompareTo(Objectobj){if(!(objinstanceofStudent))thrownewRuntimeException("NotStudentclass");Studentp=(Student)obj;//Whennameandagearethesame,theelementsarethesameif(this.name.equals(p.getName())&&p.getAge()==this.age){System.out.println(name+"..."+age);return0;}elsereturn1;}}你期待的結(jié)果是什么？實(shí)際看到的錯誤信息又是什么？