/Java/Java code to compare csv file against a table

Java code to compare csv file against a table

HashMap<String, String> f1 = new HashMap<String, String>();
HashMap<String, String> f2 = new HashMap<String, String>();
// read f1, f2; use PK field as the key
List<String> deleted = new ArrayList<String>();
List<String> updated = new ArrayList<String>();
for(Map.Entry<String, String> entry : f1.keySet()) {
    if(!f2.containsKey(entry.getKey()) {
        deleted.add(entry.getValue());
    } else {
        if(!f2.get(entry.getKey().equals(f1.getValue())) {
            updated.add(f1.getValue());
        }
    }
}
for(String key : f1.keySet()) {
    f2.remove(key);
}
// f2 now contains only "new" rows

Source: stackoverflow.com

Similar codes

0 vote224 views0 answer
Java
0 vote270 views2 answers
Java class name to string
Java
4 votes286 views1 answer
How to check if recyclerview is empty
Java
0 vote321 views1 answer
How to encrypt password in properties file in spring boot
Java Spring
0 vote293 views1 answer
Editable java jcombobox
Java
0 vote262 views1 answer
Javafx listview of objects
Java
4 votes266 views1 answer
Java fps
Java
0 vote265 views1 answer
Find number of occurrences of a substring in a string java
Java
0 vote252 views1 answer
Infinity constant in java
Java
140 votes321 views18 answers
Java hello
Java