public class Student {
private String id;
private String name;
private String arg;
private String address;

public String getId() {
return id;
}

public void setId(String id) {
this.id = id;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getArg() {
return arg;
}

public void setArg(String arg) {
this.arg = arg;
}

public String getAddress() {
return address;
}

public void setAddress(String address) {
this.address = address;
}

 main方法实现CRUD

package com.railway.modules.base.test;

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

public class TestStudent {
public static void main(String[] args) {
ArrayList<Student> array = new ArrayList<Student>();
while (true) {
System.out.println("----------学生管理系统-----------");
System.out.println("---------1.查询学生信息---------");
System.out.println("---------2.添加学生信息---------");
System.out.println("---------3.删除学生信息---------");
System.out.println("---------4.修改学生信息---------");
System.out.println("---------5.输入你的选择---------");
Scanner input = new Scanner(System.in);
int a = input.nextInt();
switch (a) {
case 1:
findAllStudent(array);
break;
case 2:
addStudent(array);
break;
case 3:
deleteStudent(array);
break;
case 4:
updateStudent(array);
break;
case 5:
default:
System.out.println("谢谢你的使用");
System.exit(0);
break;
}
}
}

}

查询方法:

public static void findAllStudent(ArrayList<Student> array) {
// TODO Auto-generated method stub
if (array.size() == 0) {
System.out.println("对不起,没有学生信息");
System.out.println("请重新选择");
return;
}
System.out.println("学号\t姓名\t年龄\t居住地");
for (int x = 0; x < array.size(); x++) {
Student s = array.get(x);
System.out.println(s.getId() + "\t" + s.getName() + "\t"
+ s.getArg() + "\t" + s.getAddress());
}
}

添加方法:

public static void addStudent(ArrayList<Student> array) {
Scanner input = new Scanner(System.in);
String id;
while(true){
System.out.println("请输入你的学号");
id = input.nextLine();
// 判断ID是否重复;
boolean flag = false;

// 遍历集合信息
for (int x = 0; x < array.size(); x++) {
Student st = array.get(x);
// 取得该学生id与数组中id进行对比
if (st.getId().equals(id)) {
flag = true;
break;

}

}
if (flag) {
System.out.println("对不起,学号被占用");
}else{
break;
}
}
System.out.println("请输入你的姓名");
String name = input.nextLine();
System.out.println("请输入你的年龄");
String arg = input.nextLine();
System.out.println("请输入你的地址");
String address = input.nextLine();

Student s = new Student();
s.setId(id);
s.setName(name);
s.setArg(arg);
s.setAddress(address);
array.add(s);
System.out.println("添加成功");

}

删除方法:

public static void deleteStudent(ArrayList array) {
System.out.println("请输入你想删除学生的学号");
Scanner input = new Scanner(System.in);
String id = input.nextLine();
int index = -1;
for (int i = 0; i < array.size(); i++) {
Student s = (Student) array.get(i);
if (s.getId().equals(id)) {
index = i;
}
}
}

 修改方法:

public static void updateStudent(ArrayList<Student> array) {

// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.println("请输入你要修改的学号");
String id = input.nextLine();
int index = -1;
//变量集合
for (int i = 0; i < array.size(); i++) {
//获取所有学生对象
Student s = array.get(i);
if (s.getId().equals(id)) {
index = i;
break;
}
}
if (index == -1) {
System.out.println("不好意思,你要修改的学生信息不存在");
} else {
System.out.println("请输入学生姓名");
String name = input.nextLine();
System.out.println("请输入学生年龄");
String arg = input.nextLine();
System.out.println("请输入学生地址");
String address = input.nextLine();

//创建学生对象
Student s = new Student();
s.setId(id);
s.setId(name);
s.setArg(arg);
s.setAddress(address);

//修改集合中的学生对象
array.set(index, s);

System.out.println("修改学生成功");
}

}

 控制台打印:

"C:\Program Files\Java\jdk1.8.0_51\bin\java" -Didea.launcher.port=7534 "-Didea.launcher.bin.path=D:\Program Files (x86)\JetBrains\IntelliJ IDEA 2016.3.6\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_51\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_51\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_51\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_51\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_51\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_51\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_51\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_51\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_51\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_51\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_51\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_51\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_51\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_51\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_51\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_51\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_51\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_51\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_51\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_51\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_51\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_51\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_51\jre\lib\rt.jar;C:\Users\Administrator\Desktop\Project to reconstruct\railway-admin\target\classes;C:\Users\Administrator\Desktop\Project to 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sitory\com\fasterxml\jackson\core\jackson-core\2.10.2\jackson-core-2.10.2.jar;D:\Program Files (x86)\JetBrains\IntelliJ IDEA 2016.3.6\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain com.railway.modules.base.test.TestStudent
----------学生管理系统-----------
---------1.查询学生信息---------
---------2.添加学生信息---------
---------3.删除学生信息---------
---------4.修改学生信息---------
---------5.输入你的选择---------
1
对不起,没有学生信息
请重新选择
----------学生管理系统-----------
---------1.查询学生信息---------
---------2.添加学生信息---------
---------3.删除学生信息---------
---------4.修改学生信息---------
---------5.输入你的选择---------
2
请输入你的学号
1
请输入你的姓名
2
请输入你的年龄

3请输入你的地址

4添加成功
----------学生管理系统-----------
---------1.查询学生信息---------
---------2.添加学生信息---------
---------3.删除学生信息---------
---------4.修改学生信息---------
---------5.输入你的选择---------

很基础、 适合java初学者来进行练习以及当做课程作业来使用