java之表格数据存储

摘要

本博客主要讲述java如何存储表格数据。

表格数据存储

在解决实际问题的时候，需要涉及到如何存储表格的数据，这里讲述了一种使用javabean的方法存储表格

javabean 介绍

javabean 我觉得就是一种规范，规范类的设计，以便更好地解决问题

javabean 设计类

class User{private int id;private String name;private double salary;private String hiredate;public User() {}public User(int id, String name, double salary, String hiredate) {this.id = id;this.name = name;this.salary = salary;this.hiredate = hiredate;}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public double getSalary() {return salary;}public void setSalary(double salary) {this.salary = salary;}public String getHiredate() {return hiredate;}public void setHiredate(String hiredate) {this.hiredate = hiredate;}@Overridepublic String toString() {return "id:" + id + ",name" + name + ",salary" + salary + ",hiredate" + hiredate;}
}

表格数据存储

public class TestStoreData2 {public static void main(String[] args) {User user1 = new User(1001, "张三", 2000, "2018.5.5");User user2 = new User(1002, "李四", 1000, "2005.5.5");User user3 = new User(1003, "王五", 20000, "2008.5.5");Map<Integer, User> map = new HashMap<>();map.put(1001,user1);map.put(1002,user2);map.put(1003,user3);//获取键的集合Set<Integer> set = map.keySet();for(Integer i : set) System.out.println(i + ":" + map.get(i));}
}

public class TestStoreData2 {public static void main(String[] args) {User user1 = new User(1001, "张三", 2000, "2018.5.5");User user2 = new User(1002, "李四", 1000, "2005.5.5");User user3 = new User(1003, "王五", 20000, "2008.5.5");Map<Integer, User> map = new HashMap<>();map.put(1001,user1);map.put(1002,user2);map.put(1003,user3);//迭代器的做法Set<Map.Entry<Integer,User>> set = map.entrySet();for(Iterator<Map.Entry<Integer, User>> iter = set.iterator();iter.hasNext();){Map.Entry<Integer, User> temp = iter.next();System.out.println(temp.getKey() + ":" + temp.getValue());}}
}