Java - Write hashmap to a csv file

Question

I have a hashmap with a String key and String value. It contains a large number of keys and their respective values.

For example:

key | value
abc | a         


        

Answer 1

If you have a single hashmap it is just a few lines of code. Something like this:

Map myMap = new HashMap<>();

myMap.put("foo", "bar");
myMap.put("baz", "foobar");

StringBuilder builder = new StringBuilder();
for (Map.Entry kvp : myMap.entrySet()) {
    builder.append(kvp.getKey());
    builder.append(",");
    builder.append(kvp.getValue());
    builder.append("\r\n");
}

String content = builder.toString().trim();
System.out.println(content);
//use your prefered method to write content to a file - for example Apache FileUtils.writeStringToFile(...) instead of syso.    

result would be

foo,bar
baz,foobar