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简单介绍sql server 累计求和实现代码

Linux小百科 发布时间:2022-03-12 12:50:57 ,浏览量:0

这篇文章主要为大家详细介绍了Java实现简易学籍管理系统,文中示例代码介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们可以参考一下

本文实例为大家分享了Java实现简易学籍管理系统的具体代码,供大家参考,具体内容如下

1、我们先来讲讲什么是泛型化编程

package 学生管理系统;
  
import java.util.ArrayList;
import java.util.List;
  
/*
 * 进行泛型化编程
 * @autor:pcb
 * */
public class TestGeneric {
    //进行泛型化编程,规定类型。
    public List  courses;
    public TestGeneric() {
        this.courses = new ArrayList();
    }
    public void testAdd() {
        CourseClass cr1 = new CourseClass("1","大学语文");
        courses.add(cr1);
        //泛型集合中不能添加规定意外的对象
        //courses.add("能否添加一些奇怪的东西");
        CourseClass cr2 = new CourseClass("2","Java基础");
        courses.add(cr2);
    }
    public void testForEach() {
        //进行泛型之后,可直接利用它规定的类型及其子类型直接进行访问
        for(CourseClass cr:courses) {
            System.out.println(cr.id+":"+cr.name);
        }
    }
    //泛型集合可以添加泛型的子类型的对象实例
    public void testChild() {
        ChildCourse ccr = new ChildCourse();
        ccr.id = "3";
        ccr.name = "我是子类的课程实例对象";
        courses.add(ccr);
    }
    //泛型必须使用包装类型进行创建,例如:int和integer
    public void testBaic() {
        List list = new ArrayList();
        list.add(1);
        System.out.println("基本类型必须使用包装类作为泛型!"+list.get(0));
    }
    public static void main(String[] args) {
        TestGeneric tg = new TestGeneric();
        tg.testAdd();
        tg.testForEach();
        tg.testChild();
        tg.testForEach();
        tg.testBaic();
        //tg.testForEach();
    }
}

2、我们开始进行管理系统的创建,创建一个学生类和一个课程类

package 学生管理系统;
  
import java.util.HashSet;
import java.util.Set;
public class StudentsClass implements Comparable  {
    public String id;
    public String name;
     
    public Set courses;
     
    public StudentsClass(String id,String name){
        this.id=id;
        this.name=name;
        this.courses=new HashSet();
    }
  
    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((name == null) ? 0 : name.hashCode());
        return result;
    }
  
    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (!(obj instanceof StudentsClass))
            return false;
        StudentsClass other = (StudentsClass) obj;
        if (name == null) {
            if (other.name != null)
                return false;
        } else if (!name.equals(other.name))
            return false;
        return true;
    }
    public int compareTo(StudentsClass o) {
        return this.id.compareTo(o.id);
    }
}
package 学生管理系统;
  
public class CourseClass {
    public String id;
    public String name;
    public CourseClass(String id,String name){
        this.id=id;
        this.name=name;
    }
    public CourseClass() {
         
    }
     
    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((name == null) ? 0 : name.hashCode());
        return result;
    }
    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (!(obj instanceof CourseClass))
            return false;
        CourseClass other = (CourseClass) obj;
        if (name == null) {
            if (other.name != null)
                return false;
        } else if (!name.equals(other.name))
            return false;
        return true;
    }
}

3、利用List进行增加课程,删除课程,修改课程等的操作

package 学生管理系统;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
  
public class ListTest {
    //创建
public List coursesToSelect;
    //构造器
    public ListTest(){
         this.coursesToSelect = new ArrayList(); 
    }
     
    public void testAdd(){
        //加课
          CourseClass cr1 = new CourseClass("1","数据结构");
          coursesToSelect.add(cr1); 
          CourseClass temp = (CourseClass)coursesToSelect.get(0);
          System.out.println("添加了课程:"+temp.id+":"+temp.name);
          CourseClass cr2 = new CourseClass("2","c语言");
          coursesToSelect.add(0, cr2);
          CourseClass temp2 = (CourseClass)coursesToSelect.get(0);
          System.out.println("添加了课程:"+temp2.id+":"+temp2.name);
          CourseClass[] Course={new CourseClass("3","离散数学"),new CourseClass("4","汇编语言")};
          coursesToSelect.addAll(Arrays.asList(Course));
          CourseClass temp3 = (CourseClass)coursesToSelect.get(2);
          CourseClass temp4 = (CourseClass)coursesToSelect.get(3);
          System.out.println("添加了两门课程:"+temp3.id+":"+temp3.name+";"+temp4.id+":"+temp4.name);
          CourseClass[] Course1= {new CourseClass("5","高等数学"),new CourseClass("6","大学英语")};
          coursesToSelect.addAll(2, Arrays.asList(Course1));
          CourseClass temp5 = (CourseClass)coursesToSelect.get(2);
          CourseClass temp6 = (CourseClass)coursesToSelect.get(3);
          System.out.println("添加了两门课程:"+temp5.id+":"+temp5.name+";"+temp6.id+":"+temp6.name);
  
    }
        //迭代器输入方法
        public void testIterator() {
            Iterator it = coursesToSelect.iterator();
            System.out.println("可选择的课程(通过迭代器访问):");
            while(it.hasNext()) {
                CourseClass cr  = (CourseClass) it.next();
                System.out.println("课程"+":"+cr.id+":"+cr.name);
            }
                 
        }
        //利用foreach语句进行遍历
        public void testForEach() {
            System.out.println("可选择的课程(通过FOREACH访问):");
            for(Object obj:coursesToSelect) {
                CourseClass cr  = (CourseClass) obj;
                System.out.println("课程"+":"+cr.id+":"+cr.name);
            }
        }
        //进行修改操作
        public void testModify() {
            coursesToSelect.set(4, new CourseClass("7","毛概"));
        }
        //利用对象进行删除操作
        public void testRmove1() {
            System.out.println("通过对象进行删除");
            CourseClass cr = (CourseClass) coursesToSelect.get(4);
            System.out.println("我是课程:"+cr.id+":"+cr.name);
            coursesToSelect.remove(cr);
            System.out.println("成功删除课程!!");
            testForEach();
        }
        //利用索引值进行删除操作
        public void testRmove2() {
//            CourseClass cr = (CourseClass) coursesToSelect.get(4);
//            System.out.println("我是课程:"+cr.id+":"+cr.name);
            System.out.println("通过索引值进行删除");
            coursesToSelect.remove(4);
            System.out.println("成功删除课程!!");
            testForEach();
        }
        //进行删除,删除多位置的方法操作
        public void testRmove3() {
            System.out.println("删除4位置和5位置的课程");
            CourseClass [] Course={(CourseClass) coursesToSelect.get(4),(CourseClass) coursesToSelect.get(5)};
            //将Course数组转化成一个集合传递进去
            coursesToSelect.removeAll(Arrays.asList(Course));
            System.out.println("成功删除课程!!");
            testForEach();
            }
    public static void main(String[] args) {
        ListTest it = new ListTest();
        it.testAdd();
        it.test();
        //it.testIterator();
        //it.testForEach();
        //it.testModify();
        //it.testForEach();
        //it.testRmove2();
        it.testRmove3();
    }
}

4、利用set集合进行删除,添加,查询操作

package 学生管理系统;
  
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;
  
public class SetTest {
    //创建
    public List  coursesToSelect;
    //向屏幕读取
    private Scanner console;
     
    public StudentsClass student;
    //进行构造
    public SetTest() {
        coursesToSelect = new ArrayList();
        console = new Scanner(System.in);
    }
     
    public void testAdd(){
        //加课
          CourseClass cr1 = new CourseClass("1","数据结构");
          coursesToSelect.add(cr1); 
          CourseClass temp = (CourseClass)coursesToSelect.get(0);
          //System.out.println("添加了课程:"+temp.id+":"+temp.name);
          CourseClass cr2 = new CourseClass("2","c语言");
          coursesToSelect.add(0, cr2);
          CourseClass temp2 = (CourseClass)coursesToSelect.get(0);
          //System.out.println("添加了课程:"+temp2.id+":"+temp2.name);
          CourseClass[] Course={new CourseClass("3","离散数学"),new CourseClass("4","汇编语言")};
          coursesToSelect.addAll(Arrays.asList(Course));
          CourseClass temp3 = (CourseClass)coursesToSelect.get(2);
          CourseClass temp4 = (CourseClass)coursesToSelect.get(3);
          //System.out.println("添加了两门课程:"+temp3.id+":"+temp3.name+";"+temp4.id+":"+temp4.name);
          CourseClass[] Course1= {new CourseClass("5","高等数学"),new CourseClass("6","大学英语")};
          coursesToSelect.addAll(2, Arrays.asList(Course1));
          CourseClass temp5 = (CourseClass)coursesToSelect.get(2);
          CourseClass temp6 = (CourseClass)coursesToSelect.get(3);
          //System.out.println("添加了两门课程:"+temp5.id+":"+temp5.name+";"+temp6.id+":"+temp6.name);
  
    }
    public void testForEach() {
        System.out.println("可选择的课程(通过FOREACH访问):");
        for(Object obj:coursesToSelect) {
            CourseClass cr  = (CourseClass) obj;
            System.out.println("课程"+":"+cr.id+":"+cr.name);
        }
    }
    //查询是否包含此课程
    public void testListContains() {
        CourseClass course = coursesToSelect.get(0);
        System.out.println("取得课程:"+course.name);
         
        System.out.println("备选课程是否包含课程:"+course.name+","
                +coursesToSelect.contains(course));
        System.out.println("请输入课程名称:");
        String name = console.next();
        CourseClass course2 = new CourseClass();
        course2.name = name;
        System.out.println("新创建课程:"+course2.name);
        System.out.println("备选课程是否包含课程:"+course2.name+","
                +coursesToSelect.contains(course2));
        //indexof来求出索引
                if(coursesToSelect.contains(course2)) {
                    System.out.println("课程:"+course2.name+"的索引位置为:"+
                coursesToSelect.indexOf(course2));
                }
    }
    public void creatStudentAndSelect() {
        //创建一个学生对象
                 student = new StudentsClass("1","小明");
                System.out.println("欢迎学生:"+student.name+"选课!");
                //从键盘输入课程
                Scanner console = new Scanner(System.in);
                for(int i = 0;i            
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