类训练-学生管理实现
来源：互联网 发布：阿里云备案域名哪里买 编辑：程序博客网 时间：2024/05/21 05:05
建立一个学生类（姓名，学号，3门课成绩（英语，数学，语文），总分），类的方法：输入，输出，学生数据，根据总分排序，打印学生名次）
import java.util.ArrayList;import java.util.Comparator;import java.util.List;import java.util.Scanner;public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); System.out.println("请输入你要录入的学生人数："); int studentNum = in.nextInt(); System.out.println("==========================================================="); List<Student> list = new ArrayList<Student>(); for(int i=0;i<studentNum;i++) { System.out.println("输入学生的学号："); String studentID = in.next(); System.out.println("输入学生的姓名："); String studentName = in.next(); System.out.println("输入数学科目的成绩："); int math = in.nextInt(); System.out.println("输入英语科目的成绩："); int English = in.nextInt(); System.out.println("输入语文科目的成绩："); int chinese = in.nextInt(); Course course = new Course(math,English,chinese); Student student = new Student(studentID,studentName,course); list.add(student); System.out.println("==========================================================="); } list.sort(new Comparator<Student>() { @Override public int compare(Student o1, Student o2) { if(o1.getCourse().getSum()>o2.getCourse().getSum()) return -1; else return 1; } }); for(Student student : list) { System.out.println("学号："+student.getStudentID()+"\t"+"姓名："+student.getStudentName()+"\t" + "总分："+student.getCourse().getSum()); } }}/** * @描述 学生类 * @author iceyu * */class Student{ private String studentID; private String studentName; private Course course; public Student() {} public Student(String studentID,String studentName,Course course) { this.course = course; this.studentID = studentID; this.studentName = studentName; } public String getStudentID() { return studentID; } public void setStudentID(String studentID) { this.studentID = studentID; } public String getStudentName() { return studentName; } public void setStudentName(String studentName) { this.studentName = studentName; } public Course getCourse() { return course; } public void setCourse(Course course) { this.course = course; }}/** * @描述 课程类 * @author iceyu * */class Course{ private int math; private int English; private int chinese; private int sum; public Course() {} public Course(int math,int English,int chinese) { this.math = math; this.chinese = chinese; this.English = English; } public int getSum() { return this.chinese + this.English + this.math; } public void setSum(int sum) { this.sum = sum; } public int getMath() { return math; } public void setMath(int math) { this.math = math; } public int getEnglish() { return English; } public void setEnglish(int english) { English = english; } public int getChinese() { return chinese; } public void setChinese(int chinese) { this.chinese = chinese; }}
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最终结果：
请输入你要录入的学生人数：输入学生的学号：001输入学生的姓名：小明输入数学科目的成绩：67输入英语科目的成绩：78输入语文科目的成绩：输入学生的学号：002输入学生的姓名：小红输入数学科目的成绩：89输入英语科目的成绩：99输入语文科目的成绩：输入学生的学号：003输入学生的姓名：小白输入数学科目的成绩：78输入英语科目的成绩：67输入语文科目的成绩：最终排名：学号：002 姓名：小红 总分：278学号：001 姓名：小明 总分：200学号：003 姓名：小白 总分：200
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覆盖tostring方法输出：
package 学生管理;import java.util.ArrayList;import java.util.Comparator;import java.util.List;import java.util.Scanner;public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); System.out.println("请输入你要录入的学生人数："); int studentNum = in.nextInt(); System.out.println("==========================================================="); List<Student> list = new ArrayList<Student>(); for(int i=0;i<studentNum;i++) { System.out.println("输入学生的学号："); String studentID = in.next(); System.out.println("输入学生的姓名："); String studentName = in.next(); System.out.println("输入数学科目的成绩："); int math = in.nextInt(); System.out.println("输入英语科目的成绩："); int English = in.nextInt(); System.out.println("输入语文科目的成绩："); int chinese = in.nextInt(); Course course = new Course(math,English,chinese); Student student = new Student(studentID,studentName,course); list.add(student); System.out.println("==========================================================="); } list.sort(new Comparator<Student>() { @Override public int compare(Student o1, Student o2) { if(o1.getCourse().getSum()>o2.getCourse().getSum()) return -1; else return 1; } }); System.out.println("最终排名："); for(Student student : list) { System.out.println(student.toString()); } }}/** * @描述 学生类 * @author iceyu * */class Student{ private String studentID; private String studentName; private Course course; public Student() {} public Student(String studentID,String studentName,Course course) { this.course = course; this.studentID = studentID; this.studentName = studentName; } public String getStudentID() { return studentID; } public void setStudentID(String studentID) { this.studentID = studentID; } public String getStudentName() { return studentName; } public void setStudentName(String studentName) { this.studentName = studentName; } public Course getCourse() { return course; } public void setCourse(Course course) { this.course = course; } @Override public String toString() { String result = "学号："+this.getStudentID()+"\t"+"姓名："+this.getStudentName()+"\t" + "总分："+this.getCourse().getSum(); return result; }}/** * @描述 课程类 * @author iceyu * */class Course{ private int math; private int English; private int chinese; private int sum; public Course() {} public Course(int math,int English,int chinese) { this.math = math; this.chinese = chinese; this.English = English; } public int getSum() { return this.chinese + this.English + this.math; } public void setSum(int sum) { this.sum = sum; } public int getMath() { return math; } public void setMath(int math) { this.math = math; } public int getEnglish() { return English; } public void setEnglish(int english) { English = english; } public int getChinese() { return chinese; } public void setChinese(int chinese) { this.chinese = chinese; }
