问题描述
importjava.io.BufferedReader;importjava.io.BufferedWriter;importjava.io.FileWriter;importjava.io.IOException;importjava.io.InputStreamReader;importjava.util.Collections;importjava.util.Comparator;importjava.util.Set;importjava.util.TreeSet;/*下面文件中标红的部分（类Student的toString方法中，）引号中加入空格，与没有空格，会使生成的文件不一样，（文件的内容对不齐），对齐表示很疑惑，请各位大神指点代码取自毕向东老师的基础视频，第21天的最后一节。本代码，为控制台输入可以拷贝一下内容在控制台输入，当输入为over时，程序结束dalis,80,80,80yansadfasd,50,50,50lihaoyun,60,60,60本程序默认生成文件的地址为：C:\stuinfo.txt*/classStudentimplementsComparable<Student>{privateStringname;privateintma,cn,en;privateintsum;Student(Stringname,intma,intcn,inten){this.name=name;this.ma=ma;this.cn=cn;this.en=en;sum=ma+cn+en;}publicintcompareTo(Students){intnum=newInteger(this.sum).compareTo(newInteger(s.sum));if(num==0)returnthis.name.compareTo(s.name);returnnum;}publicStringgetName(){returnname;}publicvoidsetName(Stringname){this.name=name;}publicintgetMa(){returnma;}publicvoidsetMa(intma){this.ma=ma;}publicintgetCn(){returncn;}publicvoidsetCn(intcn){this.cn=cn;}publicintgetEn(){returnen;}publicvoidsetEn(inten){this.en=en;}publicintgetSum(){returnsum;}publicvoidsetSum(intsum){this.sum=sum;}publicinthashCode(){returnname.hashCode()+sum*78;}publicbooleanequals(Objectobj){if(!(objinstanceofStudent))thrownewClassCastException("类型不匹配");Students=(Student)obj;returnthis.name.equals(s.name)&&this.sum==s.sum;}publicStringtoString(){//,(逗号)后要有空格，不然学生成绩对不齐//可以对齐return"Student["+name+","+ma+","+cn+","+en+"]";//对不齐//return"Student["+name+","+ma+","+cn+","+en+"]";}}classStudentInfoTool{publicstaticSet<Student>getStudents()throwsIOException{returngetStudents(null);}publicstaticSet<Student>getStudents(Comparator<Student>cmp)throwsIOException{BufferedReaderbufr=newBufferedReader(newInputStreamReader(System.in));Stringline=null;Set<Student>stus=null;if(cmp==null)stus=newTreeSet<Student>();elsestus=newTreeSet<Student>(cmp);while((line=bufr.readLine())!=null){if("over".equals(line))break;String[]info=line.split(",");Studentstu=newStudent(info[0],Integer.parseInt(info[1]),Integer.parseInt(info[2]),Integer.parseInt(info[3]));stus.add(stu);}bufr.close();returnstus;}publicstaticvoidwriteToFile(Set<Student>stus)throwsIOException{BufferedWriterbufw=newBufferedWriter(newFileWriter("C:\stuinfo.txt"));for(Studentstu:stus){bufw.write(stu.toString()+"t");bufw.write(stu.getSum()+"");bufw.newLine();bufw.flush();}bufw.close();}}publicclassStudentInfoTest{publicstaticvoidmain(String[]args)throwsIOException{Comparator<Student>cmp=Collections.reverseOrder();Set<Student>stus=StudentInfoTool.getStudents(cmp);StudentInfoTool.writeToFile(stus);}}
解决方案
解决方案二：
输出一个t制表符就对齐了，这种问题也问，自己不多想想啊。
解决方案三：
引用1楼rumlee的回复:
输出一个t制表符就对齐了，这种问题也问，自己不多想想啊。
你说的加制表符：t的方法我试了，不行，后面的总分sum对不齐的我机子上的运行结果：（逗号后面加空格的方式，拷贝到这竟然没对齐，我电脑的文本是对齐的）","Student[lisi,90,90,90]270Student[wangwu,80,80,80]240Student[zhangsan,70,70,70]210这个是你的方法，后面加制表符t的，拷贝到这也没有对齐",t"Student[lisi,90,90,90]270Student[wangwu,80,80,80]240Student[zhangsan,70,70,70]210