public class Student {
private String name;
private int chinese;
private int math;
private int english;
public Student() {
}
public Student(String name, int chinese, int math, int english) {
this.name = name;
this.chinese = chinese;
this.math = math;
this.english = english;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getChinese() {
return chinese;
}
public void setChinese(int chinese) {
this.chinese = chinese;
}
public int getMath() {
return math;
}
public void setMath(int math) {
this.math = math;
}
public int getEnglish() {
return english;
}
public void setEnglish(int english) {
this.english = english;
}
public int getSum(){
return this.chinese+this.math+this.english;
}
}
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Comparator;
import java.util.Scanner;
import java.util.TreeSet;
public class TreeSetToFileDemo {
public static void main(String[] args) throws IOException {
//创建TreeSet集合,通过比较器排序进行排序
TreeSet<Student> ts = new TreeSet<Student>(new Comparator<Student>() {
@Override
public int compare(Student s1, Student s2) {
//成绩总分从高到低
int num = s2.getSum() - s1.getSum();
//次要条件
int num2 = num==0?s1.getChinese()-s2.getChinese():num;
int num3 = num2==0?s1.getMath()-s2.getMath():num2;
int num4 = num3==0?s1.getName().compareTo(s2.getName()):num3;
return num4;
}
});
//键盘录入学生数据
for (int i = 0; i < 5; i++) {
Scanner sc = new Scanner(System.in);
System.out.println("请录入第"+(i+1)+"个学生信息:");
System.out.println("姓名:");
String name = sc.nextLine();
System.out.println("语文成绩:");
int chinese = sc.nextInt();
System.out.println("数学成绩:");
int math = sc.nextInt();
System.out.println("英语成绩:");
int english = sc.nextInt();
//创建学生对象,把键盘录入的数据对应赋值给学生对象的成员变量
Student s = new Student();
s.setName(name);
s.setChinese(chinese);
s.setMath(math);
s.setEnglish(english);
//把学生对象添加到集合中
ts.add(s);
}
//创建字符缓冲输出流对象
BufferedWriter bw = new BufferedWriter(new FileWriter("/home/ding/IdeaProjects/Study/src/com/itheima_02/file/ts.txt"));
//遍历集合,得到每一个学生对象
for(Student s : ts){
//把学生对象的数据拼接成指定格式的字符串
StringBuilder sb = new StringBuilder();
sb.append(s.getName()).append(",").append(s.getChinese()).append(",").append(s.getMath()).append(",").append(s.getEnglish()).append(",").append(s.getSum());
//调用字符缓冲输出流对象的方法写数据
bw.write(sb.toString());
bw.newLine();
bw.flush();
}
//释放资源
bw.close();
}
}