用java数组实现录入学生成绩查看各科排序
考试成绩查询文档需求：* 定义学生类(多个科目成绩)* 输入多个学生成绩信息* 按照不同科目成绩进行排序输出/*** 定义学生类(多个科目成绩)*/public class Student {String name;double chineseScore;double mathScore;double englishScore;public Student() {}public Student(S
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考试成绩查询
文档需求：* 定义学生类(多个科目成绩)* 输入多个学生成绩信息* 按照不同科目成绩进行排序输出
/**
* 定义学生类(多个科目成绩)
*/
public class Student {
String name;
double chineseScore;
double mathScore;
double englishScore;
public Student() {
}
public Student(String name, double chineseScore, double mathScore, double englishScore) {
this.name = name;
this.chineseScore = chineseScore;
this.mathScore = mathScore;
this.englishScore = englishScore;
}
}
/**
* 学生成绩信息
*/
public class StudentScore {
//创建学生成绩数组，长度为5
Student[] studentScoreArrays = new Student[5];
public void setScore(int index, Student name) {//添加成绩类到成绩数组中
studentScoreArrays[index] = name;
}
public Student[] getScore() { //返回学生成绩
return studentScoreArrays;
}
}
/**
* 按照不同科目成绩进行排序输出
*/
public class Task {
public static void main(String[] args) {
//获取用户输入
Scanner scanner = new Scanner(System.in);
//创建一个学生成绩对象
StudentScore studentScore = new StudentScore();
//输入多个学生成绩信息
inputSeveralStudentScoreInfomation(scanner, studentScore);
//打印学生成绩表
Student[] print = printStudentScore(studentScore);
//对学生成绩表排序,按照不同科目成绩进行排序输出
System.out.println("是否进行排序？ 是y 否n");
String flag = scanner.next();
if (flag.equals("y")) {
while (true) {
System.out.println("输入要排序的科目:1语文 2数学 3英语 9退出");
int subject = scanner.nextInt();
switch (subject) {
case 1:
//找到语文成绩，对语文成绩进行降序排序
sortChinese(print);
break;
case 2:
//找到数学成绩，对数学成绩进行降序排序
sortMath(print);
break;
case 3:
//找到英语成绩，对英语成绩进行降序排序
sortEnglish(print);
break;
case 9:
System.out.println("结束排序");
return;
}
}
} else {
System.out.println("-----程序结束-----");
printStudentScore(studentScore);
System.out.println("-----------------");
}
}
/*
打印学生成绩表
*/
private static Student[] printStudentScore(StudentScore studentScore) {
System.out.println("==============学生成绩表==============");
System.out.println("姓名\t语文成绩\t\t数学成绩\t\t英语成绩");
Student[] print = studentScore.getScore();
//使用增强for循环
for (Student stu : print) {
System.out.println(stu.name + "\t\t" + stu.chineseScore + "\t\t" + stu.mathScore + "\t\t" + stu.englishScore);
}
return print;
}
/*
输入多个学生成绩信息
*/
private static void inputSeveralStudentScoreInfomation(Scanner scanner, StudentScore studentScore) {
//定义一个长度为5的学生成绩表
for (int i = 0; i < studentScore.studentScoreArrays.length; i++) {
System.out.println("请输入姓名");
String inputName = scanner.next();
System.out.println("请输入语文成绩");
double inputChinese = scanner.nextDouble();
System.out.println("请输入数学成绩");
double inputMath = scanner.nextDouble();
System.out.println("请输入英语成绩");
double inputEnglish = scanner.nextDouble();
Student studentIn = new Student(inputName, inputChinese, inputMath, inputEnglish);
//把成绩传给学生成绩数组
studentScore.setScore(i, studentIn);
}
}
/*
找到英语成绩，对英语成绩进行降序排序
*/
private static void sortEnglish(Student[] print) {
//冒泡排序（降序）
for (int i = 0; i < print.length - 1; i++) {
for (int j = 0; j < print.length - 1 - i; j++) {
String tempName;
double tempChineseScore;
double tempMathScore;
double tempEnglishScore;
if (print[j].englishScore < print[j + 1].englishScore) {
//名字对应英语成绩排序
tempName = print[j].name;
print[j].name = print[j + 1].name;
print[j + 1].name = tempName;
//语文对应名字成绩排序
tempChineseScore = print[j].chineseScore;
print[j].chineseScore = print[j + 1].chineseScore;
print[j + 1].chineseScore = tempChineseScore;
//数学对应名字成绩排序
tempMathScore = print[j].mathScore;
print[j].mathScore = print[j + 1].mathScore;
print[j + 1].mathScore = tempMathScore;
//英语成绩(降序)
tempEnglishScore = print[j].englishScore;
print[j].englishScore = print[j + 1].englishScore;
print[j + 1].englishScore = tempEnglishScore;
}
}
}
System.out.println("------------------------------------");
System.out.println("对英语成绩降序排序后");
System.out.println("==============学生成绩表==============");
System.out.println("姓名\t语文成绩\t\t数学成绩\t\t英语成绩");
//使用增强for循环
for (Student stu : print) {
System.out.println(stu.name + "\t\t" + stu.chineseScore + "\t\t" + stu.mathScore + "\t\t" + stu.englishScore);
}
}
/*
找到数学成绩，对数学成绩进行降序排序
*/
private static void sortMath(Student[] print) {
//冒泡排序（降序）
for (int i = 0; i < print.length - 1; i++) {
for (int j = 0; j < print.length - 1 - i; j++) {
String tempName;
double tempChineseScore;
double tempMathScore;
double tempEnglishScore;
//判断条件是数学成绩（降序）
if (print[j].mathScore < print[j + 1].mathScore) {
//名字对应数学成绩排序
tempName = print[j].name;
print[j].name = print[j + 1].name;
print[j + 1].name = tempName;
//语文对应名字成绩排序
tempChineseScore = print[j].chineseScore;
print[j].chineseScore = print[j + 1].chineseScore;
print[j + 1].chineseScore = tempChineseScore;
//数学成绩(降序)
tempMathScore = print[j].mathScore;
print[j].mathScore = print[j + 1].mathScore;
print[j + 1].mathScore = tempMathScore;
//英语对应名字成绩排序
tempEnglishScore = print[j].englishScore;
print[j].englishScore = print[j + 1].englishScore;
print[j + 1].englishScore = tempEnglishScore;
}
}
}
System.out.println("------------------------------------");
System.out.println("对数学成绩降序排序后");
System.out.println("==============学生成绩表==============");
System.out.println("姓名\t语文成绩\t\t数学成绩\t\t英语成绩");
//使用增强for循环
for (Student stu : print) {
System.out.println(stu.name + "\t\t" + stu.chineseScore + "\t\t" + stu.mathScore + "\t\t" + stu.englishScore);
}
}
/*
找到语文成绩，对语文成绩进行降序排序
*/
private static void sortChinese(Student[] print) {
//冒泡排序（降序）
for (int i = 0; i < print.length - 1; i++) {
for (int j = 0; j < print.length - 1 - i; j++) {
String tempName;
double tempChineseScore;
double tempMathScore;
double tempEnglishScore;
//判断条件是语文成绩（降序）
if (print[j].chineseScore < print[j + 1].chineseScore) {
//名字对应语文成绩排序
tempName = print[j].name;
print[j].name = print[j + 1].name;
print[j + 1].name = tempName;
//语文成绩(降序)
tempChineseScore = print[j].chineseScore;
print[j].chineseScore = print[j + 1].chineseScore;
print[j + 1].chineseScore = tempChineseScore;
//数学对应名字成绩排序
tempMathScore = print[j].mathScore;
print[j].mathScore = print[j + 1].mathScore;
print[j + 1].mathScore = tempMathScore;
//英语对应名字成绩排序
tempEnglishScore = print[j].englishScore;
print[j].englishScore = print[j + 1].englishScore;
print[j + 1].englishScore = tempEnglishScore;
}
}
}
System.out.println("------------------------------------");
System.out.println("对语文成绩降序排序后");
System.out.println("==============学生成绩表==============");
System.out.println("姓名\t语文成绩\t\t数学成绩\t\t英语成绩");
for (Student stu : print) {
System.out.println(stu.name + "\t\t" + stu.chineseScore + "\t\t" + stu.mathScore + "\t\t" + stu.englishScore);
}
}
}
大致思路：
编译器运行运行结果如下
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