ArrayList练习-学生管理系统

学生类

package Student;

public class Student {
   private String name;
   private String sex;
   private String id;
   private String address;
   
public Student(){}
   
public Student(String name,  String id,String sex, String address) {
	super();
	this.name = name;
	this.sex = sex;
	this.id = id;
	this.address = address;
}
public String getName() {
	return name;
}
public void setName(String name) {
	this.name = name;
}
public String getSex() {
	return sex;
}
public void setSex(String sex) {
	this.sex = sex;
}
public String getId() {
	return id;
}
public void setId(String id) {
	this.id = id;
}
public String getAddress() {
	return address;
}
public void setAddress(String address) {
	this.address = address;
}
 
}

测试类

package Student;

import java.util.ArrayList;
import java.util.Scanner;

public class StudentMan {
	public static void main(String[] args) {
		ArrayList<Student> array=new ArrayList<Student>();
		while(true){
		System.out.println("----------欢迎进入学生管理系统----------");
        System.out.println("          1.添加学生                              ");
        System.out.println("          2.删除学生          ");
        System.out.println("          3.修改学生          ");
        System.out.println("          4.查看所有学生          ");
        System.out.println("          5.退出                   ");
        System.out.println("          请输入你的选择：          ");
        Scanner s=new Scanner(System.in);
        int num=s.nextInt();
        switch(num){
        case 1:
        	addStudent(array);
        	break;
        case 2:
        	deleteStu(array);
        	break;
        case 3:
        	alert(array);
        	break;
        case 4:
        	selectStu(array);
        	break;
        case 5:
        	System.out.println("感谢使用");
        	System.exit(0);//JVM退出
        	
        }
		}
	}
    public static void addStudent(ArrayList<Student> array){
    	Scanner sc=new Scanner(System.in);
    	System.out.println("请输入姓名");
    	String name=sc.nextLine();
    	System.out.println("请输入学号");
    	String id=sc.nextLine();
    	System.out.println("请输入性别");
    	String sex=sc.nextLine();
    	System.out.println("请输入居住地");
    	String address=sc.nextLine();
    	
    	if(isUsed(array,id)){
    		System.out.println("该学号已经存在,添加失败");
    		return;
    	}
    	Student stu=new Student(name,id,sex,address);
    	
    	System.out.println(array.add(stu)?"添加成功！":"添加失败");
    }
    public static boolean isUsed(ArrayList<Student> array,String id){
    	boolean flag=false;
    	for(int i=0;i<array.size();i++){
    		Student stu=array.get(i);
    		if(stu.getId().equals(id)){
    			flag=true;
    			break;
    		}
    	}
    	return flag;
    }
    public static void selectStu(ArrayList<Student> array){
    	if(array.size()==0){
    		System.out.println("无信息，请先添加信息");
    		return;
    	}
    	System.out.println("学号\t姓名\t性别\t居住地");
    	Student stu=new Student();
    	for(int i=0;i<array.size();i++){
    		Student s=array.get(i);
    		System.out.println(s.getId()+"\t"+s.getName()+"\t"+s.getSex()+"\t"+s.getAddress());
    	}
    	
    }
    public static void deleteStu(ArrayList<Student> array){
    	Scanner s=new Scanner(System.in);
    	System.out.println("请输入要删除的学生id");
    	String id =s.nextLine();
    	for(int i=0;i<array.size();i++){
    		Student stu=array.get(i);
    		if(stu.getId().equals(id)){
    			array.remove(i);
    			System.out.println("删除成功！");
    		}else{
    			System.out.println("您的输入有误");
    		}
    	}
    	
    	
    	
    }
    public static void alert(ArrayList<Student> array){
    	Scanner sc=new Scanner(System.in);
    	System.out.println("请输入要修改的学生学号：");
    	String stuid=sc.nextLine();
    	for(int i=0;i<array.size();i++){
    		Student student=array.get(i);
    		if(student.getId().equals(stuid)){
    			
    		}else{
    			System.out.println("该学生不存在");
    			return;
    			
                
    		}
    	}
    	System.out.println("姓名：");
    	String name=sc.nextLine();
    	System.out.println("学号：");
    	String id=sc.nextLine();
    	System.out.println("性别：");
    	String sex=sc.nextLine();
    	System.out.println("居住地：");
    	String address=sc.nextLine();
    	Student stu=new Student(name,id,sex,address);
    	
    	for(int i=0;i<array.size();i++){
    		
    			array.set(i, stu);
    			System.out.println("修改成功！");  		
    	}
    	
    }
}