java 怎么修改Dnashorn参数 java中如何修改信息

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勇往直前的巨人 2024-02-23 10:29:11

文章标签 java 怎么修改Dnashorn参数 java 开发语言后端 System 文章分类 Java 后端开发

Java学生管理系统之查询与修改—Day06

1.说明

1.用户根据提示输入相应的数字选择功能：

1）.查看学生信息
2）.输入学生Id删除对应学生
3）.选择修改要修改的项目：

（01.Id
（02.姓名
（03.性别
（04.年龄

2.实现思路

首先创建一个JavaBean类用来创建学生学对象

学生属性：Id、姓名、性别、年龄

创建一个数组用来存储学生对象
定义一个方法用来遍历数组输出学生对象信息

需要进行对象非空判断，只有对象不为空时才进行输出，否则程序报错

定义一个方法用来删除指定了Id的学生信息

非空判断
根据Id返回的索引将该学生对象在数组上的信息赋值为null

定义方法修改学生信息

输入1修改学生Id
输入2修改学生姓名
输入3修改学生性别
输入4修改学生年龄

代码实现

1.JavaBean类

package com.java.StudentMmDk;

public class StudentBean {
    private int Id;
    private String name;
    private char gender;
    private int age;

    public StudentBean() {
    }

    public StudentBean(int Id, String name, char gender, int age) {
        this.Id = Id;
        this.name = name;
        this.gender = gender;
        this.age = age;
    }

    /**
     * 获取
     * @return Id
     */
    public int getId() {
        return Id;
    }

    /**
     * 设置
     * @param Id
     */
    public void setId(int Id) {
        this.Id = Id;
    }

    /**
     * 获取
     * @return name
     */
    public String getName() {
        return name;
    }

    /**
     * 设置
     * @param name
     */
    public void setName(String name) {
        this.name = name;
    }

    /**
     * 获取
     * @return gender
     */
    public char getGender() {
        return gender;
    }

    /**
     * 设置
     * @param gender
     */
    public void setGender(char gender) {
        this.gender = gender;
    }

    /**
     * 获取
     * @return age
     */
    public int getAge() {
        return age;
    }

    /**
     * 设置
     * @param age
     */
    public void setAge(int age) {
        this.age = age;
    }

//    public String toString() {
//        return "StudentBean{Id = " + Id + ", name = " + name + ", gender = " + gender + ", age = " + age + "}";
//    }
}

2.遍历数组输出学生信息

//打印学生信息
    public static void getStudentInfo(StudentBean[] array) {
        for (int i = 0; i < array.length; i++) {
            StudentBean student;
            student = array[i];
            if (student != null) {
                System.out.println(student.getId() + "," + student.getName() + "," + student.getGender() + "," + student.getAge());
            }
        }
    }

3.获取Id在数组中的索引

//获取Id在数组中的索引
    public static int getIndex(StudentBean[] array, int id) {
        //遍历数组获取每一个对象
        for (int i = 0; i < array.length; i++) {
            StudentBean student = array[i];
            //判断对象是否为空
            if (student != null) {
                if (student.getId() == id) {
                    return i;
                }
            }
        }
        return -1;
    }

4.修改学生信息

//修改学生信息
    public static StudentBean[] getChangeArray(StudentBean[] array, int id) {
        //获取要修改的学生的Id
        Scanner sc = new Scanner(System.in);
        int index = getIndex(array, id);
        System.out.println("输入1修改学生Id，输入2修改学生名字，输入3修改学生性别，输入4修改学生年龄,输入0停止修改：");
        int choose = sc.nextInt();
        StudentBean st = new StudentBean();
//    01.Id
//    02.姓名
//    03.性别
//    04.年龄
        while (true){
            if (choose == 1) {
                System.out.println("要修改的Id：");
                st = array[index];
                int id2 = sc.nextInt();
                st.setId(id2);
                break;
            } else if (choose == 2) {
                System.out.println("要修改的名字：");
                st = array[index];
                String name = sc.next();
                st.setName(name);
                break;
            } else if (choose == 3) {
                System.out.println("要修改的性别：");
                st = array[index];
                char gender = sc.nextLine().charAt(0);
                st.setGender(gender);
                break;
            }else if (choose == 4){
                System.out.println("要修改的年龄：");
                st = array[index];
                int age = sc.nextInt();
                st.setAge(age);
                break;
            } else if (choose == 0){
                System.out.println("exit!");
                break;
            }else {
                System.out.println("请选择正确的功能：");
            }

完整测试类

package com.java.StudentMmDk;
//Author:Yh

import java.util.Scanner;

/**
 * 定义一个数组存储学生的信息：Id、姓名、性别、年龄、班级
 * 1.用户根据提示输入相应的数字选择功能：
 * 1）.查看学生信息
 * 2）.输入学生Id删除对应学生
 * 3）.选择修改要修改的项目：
 * （01.Id
 * （02.姓名
 * （03.性别
 * （04.年龄
 */
public class TestStudentMmDk {
    public static void main(String[] args) {
        //创建学生对象数组
        StudentBean[] studentArray = getArray();
        //功能选择
        Scanner scan = new Scanner(System.in);
        System.out.println("输入1,输出学生信息，输入2删除学生，输入3修改学生信息,输入0退出系统：");
        while (true) {
            int choose = scan.nextInt();
            if (choose == 1) {
                getStudentInfo(studentArray);
                System.out.println("================");
                System.out.println();
            } else if (choose == 2) {
                System.out.println("请输入您想要删除的学生Id(输入0停止删除):");
                boolean flog = true;
                while (flog) {
                    int id = scan.nextInt();
                    int index = getIndex(studentArray, id);
                        if (index >= 0) {
                            //说明存在该对象，删除该对象并提示删除成功
                            studentArray[index] = null;
                            System.out.println("该学生已成功删除！");
                            flog = false;
                        } else if (id == 0) {
                            flog = false;
                        } else {
                            //说明不存在该对象，提示删除失败
                            System.out.println("不存在该对象，删除失败！请重新输入想要删除的学生Id:");
                        }
                    }
                System.out.println("================");
                System.out.println();
            } else if (choose == 3) {
                System.out.println("请输入您想要修改信息的学生Id(输入0退出):");
                int id = scan.nextInt();
                if (id == 0){
                    System.out.println("exit!");
                    return;
                }else {
                    getChangeArray(studentArray, id);
                }
                System.out.println("================");
                System.out.println();
            } else if (choose == 0) {
                break;
            } else {
                System.out.println("请选择正确的功能！");
            }
        }

    }

    public static StudentBean[] getArray() {
        StudentBean[] studentArray = new StudentBean[4];
        StudentBean stu1 = new StudentBean(01, "丽丽", '女', 19);
        StudentBean stu2 = new StudentBean(02, "红红", '女', 18);
        StudentBean stu3 = new StudentBean(03, "小帅", '男', 20);
        StudentBean stu4 = new StudentBean(04, "小强", '男', 19);
        studentArray[0] = stu1;
        studentArray[1] = stu2;
        studentArray[2] = stu3;
        studentArray[3] = stu4;
        return studentArray;
    }

    //获取Id在数组中的索引
    public static int getIndex(StudentBean[] array, int id) {
        //遍历数组获取每一个对象
        for (int i = 0; i < array.length; i++) {
            StudentBean student = array[i];
            //判断对象是否为空
            if (student != null) {
                if (student.getId() == id) {
                    return i;
                }
            }
        }
        return -1;
    }

    //打印学生信息
    public static void getStudentInfo(StudentBean[] array) {
        for (int i = 0; i < array.length; i++) {
            StudentBean student;
            student = array[i];
            if (student != null) {
                System.out.println(student.getId() + "," + student.getName() + "," + student.getGender() + "," + student.getAge());
            }
        }
    }

    //修改学生信息
    public static StudentBean[] getChangeArray(StudentBean[] array, int id) {
        //获取要修改的学生的Id
        Scanner sc = new Scanner(System.in);
        int index = getIndex(array, id);
        System.out.println("输入1修改学生Id，输入2修改学生名字，输入3修改学生性别，输入4修改学生年龄,输入0停止修改：");
        int choose = sc.nextInt();
        StudentBean st = new StudentBean();
//    01.Id
//    02.姓名
//    03.性别
//    04.年龄
        while (true){
            if (choose == 1) {
                System.out.println("要修改的Id：");
                st = array[index];
                int id2 = sc.nextInt();
                st.setId(id2);
                break;
            } else if (choose == 2) {
                System.out.println("要修改的名字：");
                st = array[index];
                String name = sc.next();
                st.setName(name);
                break;
            } else if (choose == 3) {
                System.out.println("要修改的性别：");
                st = array[index];
                char gender = sc.nextLine().charAt(0);
                st.setGender(gender);
                break;
            }else if (choose == 4){
                System.out.println("要修改的年龄：");
                st = array[index];
                int age = sc.nextInt();
                st.setAge(age);
                break;
            } else if (choose == 0){
                System.out.println("exit!");
                break;
            }else {
                System.out.println("请选择正确的功能：");
            }
        }

        return array;
    }
}

END!

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