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题目:
public class Student {
private String name;
private int chinese;
private int math;
private int english;
public Student() {
super();
}
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 getTotal(){
return (this.chinese + this.math + this.english);
}
@Override
public String toString() {
return "Student{" +
"name='" + name + '\'' +
", chinese=" + chinese +
", math=" + math +
", english=" + 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 Demo2 {
public static void main(String[] args) throws IOException {
//创建TreeSet集合
TreeSet<Student> set = new TreeSet<>(new Comparator<Student>() {
@Override
public int compare(Student s1, Student s2) {
int cmp1 = s2.getTotal() - s1.getTotal();
int cmp2 = cmp1 == 0 ? s2.getName().compareTo(s1.getName()) : cmp1;
return cmp2;
}
});
for (int i = 0;i < 3;i++){
//输入学生信息
System.out.println("请输入第"+(i+1)+"个学生信息:");
Scanner sc = new Scanner(System.in);
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();
//创建学生对象并录入信息
Student s = new Student();
s.setName(name);
s.setChinese(chinese);
s.setMath(math);
s.setEnglish(english);
//将学生添加到集合里
set.add(s);
}
//3.遍历集合并写入文件
BufferedWriter writer = new BufferedWriter(new FileWriter("student.txt"));
String content="";
for (Student s :set) {
StringBuilder sb = new StringBuilder("姓名:" + s.getName() + ", 语文成绩:" + s.getChinese() +
", 数学成绩:" + s.getMath() + ", 英语成绩:" + s.getEnglish());
writer.write(sb.toString());
writer.newLine();
writer.flush();
content+=sb.toString()+"\n";
}
//关闭资源
writer.close();
System.out.println("数据写入文件完成");
System.out.println("文件中的数据如下:");
System.out.println(content);
}
}
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