In a Map, use put to update an existing value

 Existing values in a Map entry can be updated using "put":

package org.nstern.demos.app;

import java.util.HashMap;
import java.util.Map;

public class MapPutDemo {

    public static void main(String[] args) {

        Map<String, String> map = new HashMap<>();
        map.put("Andy", "hello");
        map.put("Bernie", "hi");
        System.out.println(map);
        map.put("Andy", "world");
        System.out.println(map);
    }
}

Output:

{Andy=hello, Bernie=hi}
{Andy=world, Bernie=hi}

GIT : push a change from a local branch to a new remote branch

1. Create a new local branch

$git checkout -b  feature/my-new-branch

2. Push the new local branch to a remote repo, creating a new remote branch

$git push -u origin feature/my-new-branch

See reference

Builder Implementation

 Class with Builder:

1. public class MyClass {
2. 
   
3.     public String member;
4. 
   
5.     public static class Builder {
6.         MyClass class = new MyClass();
7. 
   
8.         public Builder withMember(String member) {
9.             class.member = member;
10.             return this;
11.         }
12. 
    
13.         public MyClass build() {
14.             return class;
15.         }
16.     }
17. }

Call

1. package ch.mobi.vvn.baustein.dto;
2. 
   
3. public class Caller {
4. 
   
5.     void myMethod(){
6.         MyClass myClass = new MyClass.Builder()
7.           .withMember("x")
8.           .build();
9.     }
10. }

Read the content of a blob field in Oracle

 Works simply using conversion to clob:

$select to_clob(my_column) from  my_table;

Virtual board with sticky notes

 Found and used a good sticky notes app : https://app.mural.co/

How to use XStream to generate xml from an object

I had to instrumentalize my code to generate tests. For that purpose, I used serialization to capture my objects state from the server while running some system tests. And I used the generated files for my tests using deserialization.

To tackle the complexity of some object graphs, I choose to use Xstream to generate xml.

Here's how to dump an object to xml:

XStream xstream = new XStream();

String xml = xstream.toXML(cs);
String filePath = "output.xml";
try{
new File(filePath).createNewFile();
try (Writer writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(filePath), "utf-8"))) {
writer.write(xml);
writer.flush();
}
} catch (IOException e){
e.printStackTrace();
}

I packed it into an utility class: 

...
String fpxmlcurrentLossratioContractDTO = "currentLossratioContractDTO.xml";
XmlHelper.writeToFileAsXml(currentLossratioContractDTO,fpxmlcurrentLossratioContractDTO);
...