58 containers case: a table data storage

Container is used to store data, both of the two containers will be used herein to store a data table.

The container may be used any container, choose the right, to meet the demand.

This case is a container used: Column: Use the Map Line: Use List

Target table shows:

Code:

To one word: ORM Object Relational Mapping

_20191213 Package; 

Import of java.util.ArrayList; 
Import the java.util.HashMap; 
Import the java.util.Iterator; 
Import java.util.List; 
Import a java.util.Map; 

/ ** 
 * use the container to store a table 
 * @ TEDU author 
 * List stored in the Map 
 * / 
public class ContainerDemo { 
	public static void main (String [] args) { 
		// table row: use ArrayList, rank 
		List <Map <String, Object >> row = new ArrayList <> (); 
		// table columns: use Map, the data corresponding to the key up 
		the Map <String, Object> = new new column1 the HashMap <> (); 
		column1.put ( "ID", 1001); 
		column1.put ( "name" "Joe Smith"); 
		column1.put ( "salary", 20000); 
		column1.put ( "entry date", "2018.05.04");
		
		Map<String,Object> column2 = new HashMap<>();
		column2.put("ID",1002);
		column2.put("姓名","李四");
		column2.put("薪水",12000);
		column2.put("入职日期","2014.04.14");
		
		Map<String,Object> column3 = new HashMap<>();
		column3.put("ID",1003);
		column3.put("王五","张三");
		column3.put("薪水",21000);
		column3.put("入职日期","2013.11.04");
		//将每一条记录添加到行中
		row.add(column1);
		row.add(column2);
		row.add(column3);
		
		for(int i = 0;i < row.size();i++) {
			Iterator it = row.get(i).entrySet().iterator();
			while(it.hasNext()) {
				System.out.print(it.next()+" ");
			}
			System.out.println();
		}
	}
}