學(xué)生成績管理系統(tǒng)importjava.util.*;importjava.io.*;classStudentimplementsSerializable{ Stringname; longno; privateString[]course={"os","java","math"}; double[]cscore={0,0,0}; publicStudent(Stringname,longno,doublea,doubleb,doublec){ =name; this.no=no; this.cscore[0]=a; this.cscore[1]=b; this.cscore[2]=c; } @OverridepublicStringtoString(){ return+""+this.no+""+this.course[0]+":"+this.cscore[0] +""+this.course[1]+":"+this.cscore[1]+""+this.course[2]+":"+this.cscore[2]; }}publicclassObject{ privatestaticScannerscanner=newScanner(System.in); publicStudent[]read()throwsException{ ObjectInputStreamobjIn=newObjectInputStream(newFileInputStream("stus.data")); intnum=objIn.readInt(); Student[]stus=newStudent[num]; for(inti=0;i<num;i++){ stus[i]=(Student)objIn.readObject(); } objIn.close(); returnstus; } publicvoidadd(Student[]stus)throwsException{ Student[]s=newStudent[stus.length+1]; for(inti=0;i<s.length-1;i++){s[i]=stus[i];} System.out.print("請(qǐng)輸入要添加的學(xué)生信息：\n"+"姓名：");Stringname=scanner.next(); System.out.print("學(xué)號(hào)：");longno=scanner.nextInt(); System.out.print("os成績：");doublecscore0=scanner.nextDouble(); System.out.print("java成績：");doublecscore1=scanner.nextDouble(); System.out.print("math成績：");doublecscore2=scanner.nextDouble(); s[s.length-1]=newStudent(name,no,cscore0,cscore1,cscore2);save(s); System.out.println("添加成功！"); } publicvoiddispAll(Student[]stus){ System.out.println("現(xiàn)有Student信息為："); for(Studentstu:stus){ System.out.println(stu); } } publicvoidsave(Student[]stus)throwsException{ ObjectOutputStreamobjOut=newObjectOutputStream(newFileOutputStream("stus.data")); objOut.writeInt(stus.length); for(Studentstu:stus){ objOut.writeObject(stu); } objOut.close(); } publicvoidfindById(Student[]stus){ intno=0,i=0; System.out.print("請(qǐng)輸入學(xué)號(hào)：");no=scanner.nextInt(); for(i=0;i<stus.length;i++){ if(stus[i].no==no){System.out.println(stus[i]);break;} if(stus[i].no!=no&&i==stus.length-1){System.out.println("無該生信息！");} } } publicvoidfindByName(Student[]stus){ Stringname=""; System.out.print("請(qǐng)輸入姓名：");name=scanner.next(); for(inti=0;i<stus.length;i++){ if(name.equalsIgnoreCase(stus[i].name)==true){System.out.println(stus[i]);break;} if(name.equalsIgnoreCase(stus[i].name)==false&&i==stus.length-1){System.out.println("無該生信息！");} } } publicvoiddelById(Student[]stus)throwsException{ intno=0,i=0; System.out.print("請(qǐng)輸入學(xué)號(hào)：");no=scanner.nextInt(); for(i=0;i<stus.length;i++){ if(stus[i].no==no){System.out.println(stus[i]);stus[i]=null;save(stus);System.out.println("刪除成功！");break;} if(stus[i].no!=no&&i==stus.length-1){System.out.println("無該生信息！");} } } publicstaticvoidmain(String[]args)throwsException{ Objectdemo=newObject(); Student[]stus={newStudent("zhang",1,90,90,98),newStudent("wang",2,80,80,89),newStudent("li",3,70,70,79)}; System.out.print("請(qǐng)輸入操作的編號(hào)：");System.out.print("\n"); intchoice=0; do{ System.out.println("1添加2顯示所有學(xué)生信息3按學(xué)號(hào)查找4按姓名查找5按學(xué)號(hào)刪除6保存0退出"); choice=scanner.nextInt(); switch(choice){ case1:demo.add(demo.read());break; case2:demo.dispAll(demo.read());break; case3:demo.findById(demo.read());break; case4:demo.findByName(demo.read());break;