public class Student {
private int id;
private String name;
private int age;
public Student(int id, String name, int age) {
super();
this.id = id;
this.name = name;
this.age = age;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public String toString() {
return "Student [id=" + id + ", name=" + name + ", age=" + age + "]";
} }
import java.util.*;
import java.io.*;
public class Job2Main {
static final String studentsFileName = "Student.txt";
/*
* 将List中的Student保存到Student.txt文件中
* 格式:
* 一个Student一行,行的格式如下
* 学号,姓名,年龄
* Student.txt示例
* 1,zhang3,20
* 2,Li4,20
* 3,Wang5,20
*/
void saveStudent(List<Student> students) {
//请完成此方法
}
/*
* 读取Student.txt文件中的学生数据,每一行创建一个Student的对象,
* 多行数据便可以创建多个Student的对象,将这些对象保存到List中
* Student.txt示例
* 1,zhang3,20
* 2,Li4,20
* 3,Wang5,20
*/
List<Student> loadStudent() {
List<Student> stuList = new ArrayList<Student>();
//完成些方法
return stuList;
}
public static void main(String[] args) {
Job2Main job2=new Job2Main();
Student s1=new Student(1, "zhang3", 20);
Student s2=new Student(2, "Li4", 20);
Student s3=new Student(3, "Wang5", 20);
List<Student> stuList=new ArrayList<Student>();
stuList.add(s1);
stuList.add(s2);
stuList.add(s3);
job2.saveStudent(stuList);
List<Student> students=job2.loadStudent();
for(Student s:students){
System.out.println(s);
}
}
}
运行结果
控制台输出
Student [id=1, name=zhang3, age=20]
Student [id=2, name=Li4, age=20]
Student [id=3, name=Wang5, age=20]
生成的Student.txt文件
1,zhang3,20
2,Li4,20
3,Wang5,20
小弟在此感谢。
private int id;
private String name;
private int age;
public Student(int id, String name, int age) {
super();
this.id = id;
this.name = name;
this.age = age;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public String toString() {
return "Student [id=" + id + ", name=" + name + ", age=" + age + "]";
} }
import java.util.*;
import java.io.*;
public class Job2Main {
static final String studentsFileName = "Student.txt";
/*
* 将List中的Student保存到Student.txt文件中
* 格式:
* 一个Student一行,行的格式如下
* 学号,姓名,年龄
* Student.txt示例
* 1,zhang3,20
* 2,Li4,20
* 3,Wang5,20
*/
void saveStudent(List<Student> students) {
//请完成此方法
}
/*
* 读取Student.txt文件中的学生数据,每一行创建一个Student的对象,
* 多行数据便可以创建多个Student的对象,将这些对象保存到List中
* Student.txt示例
* 1,zhang3,20
* 2,Li4,20
* 3,Wang5,20
*/
List<Student> loadStudent() {
List<Student> stuList = new ArrayList<Student>();
//完成些方法
return stuList;
}
public static void main(String[] args) {
Job2Main job2=new Job2Main();
Student s1=new Student(1, "zhang3", 20);
Student s2=new Student(2, "Li4", 20);
Student s3=new Student(3, "Wang5", 20);
List<Student> stuList=new ArrayList<Student>();
stuList.add(s1);
stuList.add(s2);
stuList.add(s3);
job2.saveStudent(stuList);
List<Student> students=job2.loadStudent();
for(Student s:students){
System.out.println(s);
}
}
}
运行结果
控制台输出
Student [id=1, name=zhang3, age=20]
Student [id=2, name=Li4, age=20]
Student [id=3, name=Wang5, age=20]
生成的Student.txt文件
1,zhang3,20
2,Li4,20
3,Wang5,20
小弟在此感谢。
import java.io.*;
public class Job2Main {
static final String studentsFileName = "Student.txt";
/*
* 将List中的Student保存到Student.txt文件中
* 格式:
* 一个Student一行,行的格式如下
* 学号,姓名,年龄
* Student.txt示例
* 1,zhang3,20
* 2,Li4,20
* 3,Wang5,20
*/
void saveStudent(List<Student> students) {
File file = new File("Student.txt");
try {
file.createNewFile();
PrintWriter pw = new PrintWriter(file);
for (Student student : students) {
String str = student.getId()+","+student.getName()+","+student.getAge();
pw.println(str);
}
pw.flush();
pw.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//请完成此方法
}
/*
* 读取Student.txt文件中的学生数据,每一行创建一个Student的对象,
* 多行数据便可以创建多个Student的对象,将这些对象保存到List中
* Student.txt示例
* 1,zhang3,20
* 2,Li4,20
* 3,Wang5,20
*/
List<Student> loadStudent() {
List<Student> stuList = new ArrayList<Student>();
//完成些方法
File file = new File("Student.txt");
try {
file.createNewFile();
RandomAccessFile raf = new RandomAccessFile(file,"r");
String str;
int i=1;
while((str =raf.readLine())!=null){
String[] st = str.split(",");
Student student = new Student(Integer.valueOf(st[0]),st[1],Integer.valueOf(st[2]));
stuList.add(student);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return stuList;
}
public static void main(String[] args) {
Job2Main job2=new Job2Main();
Student s1=new Student(1, "zhang3", 20);
Student s2=new Student(2, "Li4", 20);
Student s3=new Student(3, "Wang5", 20);
List<Student> stuList=new ArrayList<Student>();
stuList.add(s1);
stuList.add(s2);
stuList.add(s3);
job2.saveStudent(stuList);
List<Student> students=job2.loadStudent();
for(Student s:students){
System.out.println(s);
}
}
}
class Student {
private int id;
private String name;
private int age;
public Student(int id, String name, int age) {
super();
this.id = id;
this.name = name;
this.age = age;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public String toString() {
return "Student [id=" + id + ", name=" + name + ", age=" + age + "]";
} }