如何比较2个Maps Java的值

Question

At a high level, I'm trying to compare the values of 2 string maps

Map 1: [{ExpID1, SomeExpValue1}, {ExpID2, SomeExpValue2}, ...]

Map 2: [{FriID1, SomeFriValue1}, {FriID1, SomeFriValue2}, ...]

So ultimately, I'd like my comparison to be as such:

Sudo code:

if ( ExpID1.equals(FriID1) ) {
    Assert.AssertEquals(SomeExpValue1, SomeFriValue1, "Library element does not match!")
}

However since these are Maps, some looping is required. My real question is here, how can I correctly and efficiently loop whitout having more a bunch of embedded foreach or forloops. These seem to be super expensive. I feel my current looping is somehow wrong or unnessisarily expensive. Any help or assistance would be much appreciated.

Currently what I have is this:

@Test
public void testIntegration() throws Exception {

    // Get all files in directory
    File[] files = getFilesInFolder(friendlyNamesDir);

    String linkedResp = FileUtils.readFileToString(new File(explanationResponsePath));
    Map<String, String> map1 = getIDTitleMapExpResponse(linkedResp, "node");

    int counter = 1;
    for(File f : files) {
        if(f.length() == 0) throw new Exception("File does not exist...");


        for(String expID : map1.keySet()) {
            logger.info("Exp ID: "+expID);

            Map<String, String> map2 = getIDNameMapFromFriendly(f.getCanonicalPath());
            for(String friendlyID : map2.keySet()) {
                logger.info(counter+" - Friendly ID: "+friendlyID+" Name: "+map2.get(friendlyID));
                if(friendlyID.equals(expID)) {
                    Assert.assertEquals(map1.get(friendlyID), map2.get(expID));
                }
                counter++;
            }
        }
    }
}

Answer 1

As per Java documentation:
https://docs.oracle.com/javase/8/docs/api/java/util/Map.html#equals-java.lang.Object-

You can compare maps directly, it will make sure to check for equality for elements in them.

Answer 2

I understand that the maps are not necessarily equal, but must contain equal values for equal keys. Thus:

boolean alleq = true;
Set<String> key1 = new HashSet<>( map1.keySet() );
key1.retainAll( map2.keySet();
for( String s: key1 ) ){
     if( ! map1.get(s).equals( map2.get(s) ) ){
          alleq = false;
          break;
     }
}

You can also iterate one key set and test for the presence of the key in the other set; there's no need to iterate the second set.

boolean alleq = true;
for( String key1: map1.keySet() ){
    String value2 = map2.get( key1 );
    if( value2 != null && ! value2.equals( map1.get(key1) ) ){
        alleq = false;
        break;
    }
}