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;
    }
    @Override
    public 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());
        }
    }
}