/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 vote149 views1 answer
How to sum a 2d array in java
Java
0 vote149 views1 answer
Java new.JFrame();
Java
0 vote157 views1 answer
Do i have to import files from the same package in java
Java
0 vote154 views1 answer
How to iterate pixels image java
Java
46 votes149 views3 answers
How to print out an array in java
Java
0 vote184 views1 answer
Spring data elasticsearch aggregation max
Java Spring
1 vote145 views3 answers
Sdkman
Java
0 vote166 views1 answer
Check how many times a character appears in a string java
Java
10 votes152 views5 answers
Sort 2d array by column java
Java
1 vote144 views6 answers
Kotlin to java converter
Java