Java教程

2022-07-16 长春大学 第三小组 赖哲栋

本文主要是介绍2022-07-16 长春大学 第三小组 赖哲栋，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

目录
  • 1. 员工管理系统
  • 2. 通过下标获取指定位置的数字
  • 3. 给数组倒叙输入数值
  • 4. 数组倒叙扩容
  • 5. 数组指定位置插入

**知识重点:** 1、数组倒叙扩容 2、管理系统 3、数组指定位置插入 4、通过下标获取指定位置 5、倒叙输入数组数据
**知识点掌握:**了解
**个人心得:** 今天讲的是对前几天知识的应用和巩固，编程时出现了许多问题，所幸都解决了，锻炼了逻辑思维。每天都争取多收获一点 加油！！

1. 员工管理系统

自己写的代码

import java.util.Scanner;
public class ManageSystem {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("欢迎使用员工管理系统:");
        int id = 1001;
        String[] names = new String[10];
        int[] nos = new int[10];
        int i = 0; 
        int index = -1; 
        a:
        for (; ; ) {
            System.out.println("请选择功能: 1、添加员工  2、查询员工   3、修改员工信息  4、删除员工");
            String flag = sc.next();
            switch (flag) {
                case "1":
                    System.out.println("请输入员工姓名:");
                    String num1 = sc.next();
                    names[i] = num1;
                    nos[i] = id;
                    System.out.println("添加员工成功," + "员工工号为:" + id + "员工姓名为:" + num1);
                    id++;
                    i++;
                    if (i == nos.length) {
                        int[] temp1 = new int[i+10];
                        for (int d = 0; d <nos.length ; d++) {
                            temp1[d] = nos[d];
                        }
                        nos = temp1;
                        String[] temp2 = new String[i+10];
                        for (int d = 0; d <names.length ; d++) {
                            temp2[d] = names[d];
                        }
                        names = temp2;
                    }
                    continue a;
                case "2":
                    System.out.println("请输入要查询的工号:");
                    int num2 = sc.nextInt();
                    boolean b = true;
                    for (int j = 0; j < nos.length - 1; j++) {
                        if (num2 == nos[j]) {
                            System.out.println("查询员工成功," + "员工工号为:" + nos[j] + "员工姓名为:" + names[j]);
                            b = false;
                            break;
                        }
                    }
                    while (b) {
                        System.out.println("查无此人");
                        break;
                    }
                    break;
                case "3":
                    System.out.println("请输入要修改的工号:");
                    int num3 = sc.nextInt();
                    for(int k = 0; k < nos.length - 1; k++){
                        if(num3 == nos[k]){
                            System.out.println("查询员工成功," + "员工工号为:" + nos[k] + "员工姓名为:" + names[k]);
                            System.out.println("请输入要修改的员工工号"+nos[k]+"的新名字:");
                            String num4 = sc.next();
                            names[k] = num4;
                            index = k;
                            break;
                        }
                    }
                    if(index == -1){
                        System.out.println("查无此人");
                    }
            }
        }
    }
}

老师给的代码

import java.util.Scanner;
public class Ch01 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int [] nos = new int[2];
        String [] names = new String[2];
        int no = 1001;
        int i = 0;
        while(true){
            System.out.println("欢迎使用员工管理系统");
            System.out.println("请选择功能：1.添加员工  2.查询员工  3.修改员工  4.删除员工");
            String flag = sc.next();
            switch (flag) {
                case "1":
                    System.out.println("请输入员工姓名：");
                    String name = sc.next();
                    nos[i] = no;
                    names[i] = name;
                    System.out.println("添加成功：员工的工号为：" + nos[i] + "，姓名：" + names[i]);
                    i++;
                    no++;
                    if(i >= nos.length){
                        int [] newNos = new int[nos.length + 1];
                        String [] newNames = new String[names.length + 1];
                        for (int j = 0; j < nos.length; j++) {
                            newNos[j] = nos[j];
                            newNames[j] = names[j];
                        }
                        nos = newNos;
                        names = newNames;
                    }
                    break;
                case "2":
                    System.out.println("请选择功能：1、根据工号查询  2、查询所有");
                    String n = sc.next();
                    switch (n) {
                        case "1":
                            System.out.println("请输入要查询的员工号：");
                            int s = sc.nextInt();
                            int index = -1;
                            for (int j = 0; j < nos.length; j++) {
                                if(nos[j] == s){
                                    index = j;
                                    break;
                                }
                            }
                            if(index!= -1) {
                                System.out.println("工号：" + s + "，姓名：" + names[index]);
                            }else {
                                System.out.println("工号：" + s + "不存在！");
                            }
                            break;
                        case "2":
                            for (int j = 0; j < nos.length; j++) {
                                if(nos[j] != 0){
                                    System.out.println("工号：" + nos[j] + "，姓名：" + names[j]);
                                }
                            }
                            break;
                        default:
                    }

                    break;
                case "3":
                    System.out.println("请输入要修改的工号：");
                    int x = sc.nextInt();
                    int index = -1;
                    for (int j = 0; j < nos.length; j++) {
                        if(nos[j] == x){
                            index = j;
                            break;
                        }
                    }
                    if(index!= -1) {
                        System.out.println("工号：" + x + "，姓名：" + names[index]);
                        System.out.println("请输入新的姓名：");
                        String newName = sc.next();
                        names[index] = newName;
                        System.out.println("修改成功！工号：" + x + "，姓名：" + names[index]);
                    }else {
                        System.out.println("工号：" + x + "不存在！");
                    }
                    break;
                case "4":
                    System.out.println("请输入要查询的员工号：");
                    int s = sc.nextInt();
                    int y = -1;
                    for (int j = 0; j < nos.length; j++) {
                        if(nos[j] == s){
                            y = j;
                            break;
                        }
                    }
                    if(y!= -1) {
                        System.out.println("工号：" + s + "，姓名：" + names[y]);
                        nos[y] = 0;
                        names[y] = null;

                        int [] newNos = new int[nos.length - 1];
                        String [] newNames = new String[names.length - 1];
                        for (int j = 0; j < nos.length - 1; j++) {
                           if(nos[j] == 0){
                               newNos[j] = nos[j + 1];
                               nos[j + 1] = 0;
                           }else {
                               newNos[j] = nos[j];
                           }
                           if(names[j] == null){
                               newNames[j] = names[j + 1];
                               names[j + 1] = null;
                           }else {
                               newNames[j] = names[j];
                           }
                        }
                        nos = newNos;
                        names = newNames;
                        System.out.println("工号：" + s + "删除成功！");
                    }else {
                        System.out.println("工号：" + s + "不存在！");
                    }
                    break;
                default:
            }
        }
    }
}

2. 通过下标获取指定位置的数字

import java.util.Scanner;
public class Ch02 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] arr = new int[]{4, 58, 69, 14, 22, -1};
        System.out.println("请输入一个下标:");
        int index = sc.nextInt();
        if (index < arr.length && index >= 0) {
            System.out.println("对应位置的值是:" + arr[index]);
        }else{
            System.out.println("你输入的数据有误，无法获取");
        }
    }
}

3. 给数组倒叙输入数值

import java.util.Arrays;
import java.util.Scanner;
public class Ch03 {
    public static void main(String[] args) {
        int[] arr = new int[5];
        Scanner sc = new Scanner(System.in);
        for(int i = arr.length-1;i>=0;i--){
            System.out.println("请输入第"+(i+1)+"的值");
            int a = sc.nextInt();
            arr[i] = a;
        }
        System.out.println(Arrays.toString(arr));
    }
}

4. 数组倒叙扩容

import java.util.Arrays;
import java.util.Scanner;
public class Ch04 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] arr = new int[2];
        int i = 0;
        a:
        while (true) {
            System.out.println("请输入数据：");
            int num = sc.nextInt();
            arr[arr.length - 1 -i] = num;
            i++;
            if (i >= arr.length) {
                int[] newArr = new int[arr.length * 2];
                for (int j = 0; j < arr.length; j++) {
                    newArr[newArr.length - 1 - j] = arr[arr.length - 1 - j];
                }
                arr = newArr;
            }
            System.out.println("是否要继续添加 1.是  2.否");
            String flag = sc.next();
            switch (flag) {
                case "1":
                    continue;
                case "2":
                    System.out.println("当前数组为" + Arrays.toString(arr));
                    break a;
            }
        }
    }
}

5. 数组指定位置插入

import java.util.Arrays;
import java.util.Scanner;
public class Ch05 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] arr = new int[]{1, 2, 3, 4, 5};
        int[] newArr = new int[arr.length * 2];
        for (int j = 0; j < arr.length; j++) {
            newArr[j] = arr[j];
        }
        arr = newArr;
        main:
        while (true) {
            System.out.println("请输入要插入数据的下标：");
            int index = sc.nextInt();
            System.out.println("请输入要插入的数据：");
            int num = sc.nextInt();
            int temp = arr[index];
            arr[index] = num;
            for (int i = 1; i < arr.length - index; i++) {
                arr[arr.length - i] = arr[arr.length - 1 - i];
            }
            arr[index + 1] = temp;
            System.out.println("现在数组为：" + Arrays.toString(arr));
            System.out.println("是否继续添加：1、是   2、否");
            String flag = sc.next();
            switch (flag) {
                case "1":
                    continue;
                case "2":
                    System.out.println("当前数组为：" + Arrays.toString(arr));
                    break main;
            }
        }
    }
}
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