Java内部类例题
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实验一：面向对象编程—内部类
一、实验目的：
熟悉内部类的定义和使用，掌握内部类的使用规则、枚举的定义和使用。
二、内部类
1、实验要求：
写一个Java程序，实现以下要求：
⏹学生参加某课程的考试，课程类型分为考试课和考查课。
⏹考试课最终成绩计算方法：出勤*10%+作业*10%+实验*10%+期末*70%
⏹考查课最终成绩计算方法：出勤*20%+作业*10%+实验*10%+期末*60%
2、实验运行效果：
3、程序结构：
import java.util.*;
public class inclassTest
{
public static void main(String[] args)
{
Student s1 = new Student("李红","女");
s1.inputSubject("Java","考查",90,85,75,80);
s1.inputSubject("SQL ","考试",80,90,82,75);
s1.inputSubject("J2EE","考查",78,70,65,70);
s1.printInfo();
System.out.println();
System.out.println("************************************************");
System.out.println();
Student s2 = new Student("黄晓明","男");
s2.inputSubject("Java","考查",86,67,71,70);
s2.inputSubject("SQL ","考试",77,70,85,66);
s2.inputSubject("J2EE","考查",88,74,68,80);
s2.printInfo();
}
}
class Student //学生类
{
private String name;//姓名
private String sex;//性别
//private ArrayList<Subject> subject = new ArrayList<Subject>();
private Collection<Subject> subject = new ArrayList<Subject>();
public Student()
{
}
public Student(String n,String s)
{
= n;
this.sex = s;
}
//导入学生成绩方法
public void inputSubject(String name,String type,int ats,int ass,int ls,int fs)
{
Student s = new Student();
Student.Subject sub = s.new Subject(); //新建成员内部类
sub.subName = name;
sub.type = type;
sub.setType();
sub.attentScore = ats;
sub.assignScore =ass;
bScore = ls;
sub.finalScore = fs;
subject.add(sub);
}
private class Subject //课程类
{
String subName;//课程名
String type;//课程类型
SubjectType subType = new SubjectType();//新建静态内部类void setType()
{
subType.typeName = type;
subType.setRatio();
}
int attentScore;//出勤分数
int assignScore;//作业分数
int labScore;//实验分数
int finalScore;//期末分数
}
private static class SubjectType //课程性质类
{
String typeName; //课程性质名称（考查课/考试课）
double attenRatio; //出勤比例
static final double assignRatio = 0.1; //作业比例
static final double labRatio = 0.1; //实验比例
double finalRatio; //期末比例
void setRatio() //根据课程性质设置比例的方法
{
if("考查".equals(typeName))
{
attenRatio = 0.2;
finalRatio = 0.6;
}else if("考试".equals(typeName))
{
attenRatio = 0.1;
finalRatio = 0.7;
}
}
}
public void printInfo()
{
class CalcScore //计算成绩类
{
public int calcScore(Subject sub)
{
return (int)(sub.attentScore * sub.subType.attenRatio + sub.assignScore*sub.subType.assignRatio+bScore*bRatio+sub.finalScore*su b.subType.finalRatio);
}
}
CalcScore cs =new CalcScore();
System.out.println("姓名："+name+" 性别："+ sex);
System.out.println("课程"+"性质"+"出勤"+"作业"+"实验"+"期末"+"总分");
System.out.println("===============================================");
/*
int size = subject.size();
for(int i=0;i<size;i++)
{
Subject sub =subject.get(i);
System.out.println(sub.subName+" "+sub.type+" "+sub.attentScore+" "+sub.assignScore+" "+bScore+" "+sub.finalScore+" "+cs.calcScore(sub));
}
*/
Iterator<Subject> i = subject.iterator();
while(i.hasNext())
{
Subject sub =i.next();
System.out.println(sub.subName+" "+sub.type+" "+sub.attentScore+" "+sub.assignScore+" "+bScore+" "+sub.finalScore+" "+cs.calcScore(sub));
}
}
}