答案：
class Student{
private String name;
private String age;
private String score;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getScore() {
return score;
}
public void setScore(String score) {
this.score = score;
}
public Student() {
}
}
public class FSTest {
public static void main(String[] args)throws Exception {
DataOutputStream out=new DataOutputStream(new FileOutputStream(new File("f:"+File.separator+"a.txt")));
DataInputStream in=new DataInputStream(new FileInputStream(new File("f:"+File.separator+"a.txt")));
System.out.println("請輸入學生信息：(like:20:100)");
boolean Y=true;
String str = "";
Scanner scanner=new Scanner(System.in);
while(Y){
str+= scanner.next()+":";
System.out.println("是否繼續輸入：是：Y:否：N");
String a=
scanner.next();
if(a.equalsIgnoreCase("Y")){
Y=true;
}
if(a.equalsIgnoreCase("N")){
scanner.close();
Y=false;
}
}
out.writeBytes(str);
int temp=0,len=0;
byte b[]=new byte[1024];
while((temp=in.read())!=-1){
b[len]=(byte) temp;
len++;
}
in.close();
out.close();
String s=new String(b);
String string[]=s.split("\\:");
Class<Student> student=(Class<Student>) Class.forName("FS.Student");
int j=0;
Student student2=null;
List<Student>list=new ArrayList<>();
for(int i=0;i<string.length;i++){
if((i+1)%3==1){
student2=student.newInstance();
student2.setName(string[i]);
}else if((i+1)%3==2){
student2.setAge(string[i]);
}else if((i+1)%3==0){
System.out.println(string[i]);
student2.setScore(string[i]);
list.add(student2);
}
}
for(Student s2:list){
System.out.println("姓名："+s2.getName()+" 年齡："+s2.getAge()+" 成績："+s2.getScore());
}
}
}