通过数组实现点名---------对数组进行增删操作

通过数组实现随机点名

Student类定义数组，通过getStudents()、setStudents(String[] students)方法将变动之后的数组进行修改
StudentUtil工具类，实现了对数组的添加、删除、和遍历
SuiJiDianMing类，主要业务实现

Student类

public class Student {
	private String[] students = { "学生1", "学生2", "学生3", "学生4", "学生5", "学生6" };

	public String[] getStudents() {
		return students;
	}

	public void setStudents(String[] students) {
		this.students = students;
	}
}

StudentUtil类

public class StudentUtil {

	/**
	 * 
	 * @param strings 需要遍历的数组
	 */
	public static void println(String[] strings) {
		for (int i = 0; i < strings.length; i++) {
			System.out.print(strings[i] + "\t");
		}
		System.out.println();
	}

	/**
	 * @param studens 需要在那个数组里面添加数据
	 * @param name    添加学生的姓名
	 * @return 将学生姓名添加到新的数组里面并返回该数组
	 */
	public static String[] addStudent(String[] studens, String name) {
		// 将之前数组的数据赋值到新的数组里面
		String[] strings = new String[studens.length + 1];
		for (int i = 0; i < studens.length; i++) {
			strings[i] = studens[i];
		}
		// 将添加的学生姓名加入到新数组里面
		strings[strings.length - 1] = name;
		return strings;
	}

	/**
	 * @param students 传入需要删除的数组
	 * @param name     需要删除的名字
	 * @return 如果名字不存在返回students,
	 */
	public static String[] dellStudent(String[] students, String name) {
		boolean isok = false;
		int temp = -1;
		String[] string = new String[students.length - 1];
		for (int i = 0; i < students.length; i++) {
			if (students[i].equals(name)) {
				isok = true;
				temp = i;
				break;
			}
		}
		if (!isok) {
			return students;
		}
		for (int i = 0; i < string.length; i++) {
			if (temp > i && temp != i) {
				string[i] = students[i];
			} else {
				string[i] = students[i + 1];
			}
		}
		return string;
	}
}

SuiJiDianMing类

import java.util.Random;
import java.util.Scanner;

public class SuiJiDianMing {
	public static Scanner scanner = new Scanner(System.in);
	public static boolean isOk = true;

	public static void main(String[] args) throws InterruptedException {
		Student student = new Student();
		while (true) {
			menu();
			isOk = false;
			System.out.print("输入你想执行的操作:");
			String c = scanner.next();
			switch (c) {
			case "0":
				System.out.println("退出系统");
				System.exit(0);
				break;
			case "1":
				addStu(student);
				break;
			case "2":
				dellStu(student);
				break;
			case "3":
				dianMing(student);
				break;
			case "4":
				StudentUtil.println(student.getStudents());
				break;
			default:
				System.out.println("输入错误，请重新输入");
				continue;
			}

		}
	}

	public static void dianMing(Student student) {
		System.out.println(student.getStudents()[new Random().nextInt(student.getStudents().length)]);
	}

	public static void dellStu(Student student) {
		System.out.println("请输入需要删除学生的姓名:");
		String name = scanner.next();
		String[] students = student.getStudents();
		if (StudentUtil.dellStudent(students, name).length != students.length) {
			System.out.println("删除成功");
			student.setStudents(StudentUtil.dellStudent(students, name));
		} else {
			System.out.println("删除失败");
		}

	}

	public static void addStu(Student student) {
		System.out.println("请输入需要添加学生的姓名:");
		String name = scanner.next();
		String[] students = student.getStudents();
		if (StudentUtil.addStudent(students, name).length != students.length) {
			System.out.println("添加成功");
			student.setStudents(StudentUtil.addStudent(students, name));
		} else {
			System.out.println("添加失败");
		}

	}

	public static void menu() throws InterruptedException {
		if (!isOk) {
			Thread.sleep(1000);
		}
		System.out.println("******菜单*********");
		System.out.println("请输入对应功能前序号");
		System.out.println("0、退出程序");
		System.out.println("1、增加学生");
		System.out.println("2、删除学生");
		System.out.println("3、随机点名");
		System.out.println("4、打印全部学生");
		System.out.println("****************");
	}
}

运行截图如下