Student
package homework;
* 键盘录入5个学生信息(姓名,语文成绩,数学成绩,英语成绩),按照总分从高到低存入文本文件*/
public class Student {
private String name;
private int yuwen;
private int shuxue;
private int yingyu;
public Student() {
super();
}
public Student(String name, int yuwen, int shuxue, int yingyu) {
super();
this.name = name;
this.yuwen = yuwen;
this.shuxue = shuxue;
this.yingyu = yingyu;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getYuwen() {
return yuwen;
}
public void setYuwen(int yuwen) {
this.yuwen = yuwen;
}
public int getShuxue() {
return shuxue;
}
public void setShuxue(int shuxue) {
this.shuxue = shuxue;
}
public int getYingyu() {
return yingyu;
}
public void setYingyu(int yingyu) {
this.yingyu = yingyu;
}
public int getSum() {
return this.yuwen+this.shuxue+this.yingyu;
}
}
主程序
package homework;
/*
* 键盘录入5个学生信息(姓名,语文成绩,数学成绩,英语成绩),按照总分从高到低存入文本文件
* */
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 Demo1 {
public static void main(String[] args) throws Exception {
BufferedWriter bw = new BufferedWriter(new FileWriter("bw.txt")) ;
TreeSet<Student> ts = new TreeSet<Student>(new Comparator<Student>() {
@Override
public int compare(Student s1, Student s2) {
// 总分从高到低
int num = s2.getSum() - s1.getSum();
// 总分相同的不一定语文相同
int num2 = num == 0 ? s1.getYuwen() - s2.getYuwen() : num;
// 总分相同的不一定数学相同
int num3 = num2 == 0 ? s1.getShuxue() - s2.getShuxue() : num2;
// 总分相同的不一定英语相同
int num4 = num3 == 0 ? s1.getYingyu() - s2.getYingyu() : num3;
// 姓名还不一定相同呢
int num5 = num4 == 0 ? s1.getName().compareTo(s2.getName())
: num4;
return num5;
}
});
for(int i=1;i<3;i++) {
Scanner sc=new Scanner(System.in);
System.out.println("请输入学生姓名");
String str=sc.nextLine();
Scanner sc1=new Scanner(System.in);
System.out.println("请输入学生语文");
String str1=sc1.nextLine();
Scanner sc2=new Scanner(System.in);
System.out.println("请输入学生数学");
String str2=sc2.nextLine();
Scanner sc3=new Scanner(System.in);
System.out.println("请输入学生英语");
String str3=sc3.nextLine();
// 把数据封装到学生对象中
Student s = new Student();
s.setName(str);
s.setYuwen(Integer.parseInt(str1));
s.setShuxue(Integer.parseInt(str2));
s.setYingyu(Integer.parseInt(str3));
// 把学生对象添加到集合
ts.add(s);
}
System.out.println("学生信息录入完毕");
System.out.println("学习信息从高到低排序如下：");
System.out.println("姓名\t语文成绩\t数学成绩\t英语成绩\t总分");
bw.write("学习信息从高到低排序如下：");
bw.newLine();
bw.write("姓名\t语文成绩\t数学成绩\t英语成绩\t总分");
bw.newLine();
// 遍历集合
for (Student c : ts) {
System.out.println(c.getName() + "\t" + c.getYuwen() + "\t"
+ c.getShuxue() + "\t" + c.getYingyu()+"\t"+c.getSum());
bw.write(c.getName() + "\t\t" + c.getYuwen() + "\t\t"
+ c.getShuxue() + "\t\t" + c.getYingyu()+"\t"+c.getSum());
bw.newLine();
bw.flush();
}
bw.close();
}
}