From this source we can see that the German's were to an extent treated like the Japanese. But while 120,000 Japanese were displaced and eventually put in internment camps (source) only about 11,000 Germans were actually put in camps. 300,000 Germans, however, were labelled as "enemy aliens" which is normal during times of war, and with this they had restricted travelling and property ownership rights. In terms of overall de facto domestic treatment, "Internees and excludees returned to communities facing unemployment, financial straits, loss of homes and belongings and stigmatization. No government support. Many families disrupted permanently. Many internees forbidden to speak of internment. Most internees have not spoken out of fear of the government, shame or other personal reasons. " Also, many faced "Hostile FBI raids and ransacking of homes and arrests with no warrants, unlimited imprisonment while awaiting parole and internment hearings. Hearings with minimal, if any, due process at which no witnesses or counsel were allowed. Internees did not know why they were interned. Families did not know where their loved ones were taken for days or weeks. "

The Italians, however, show a objectively worse treatment in terms of quantities. About 600,000 Italians were labelled "enemy aliens", and after Pearl Harbor, Italians faced large numbers of arrests (in the thousands) simply for their heritage. These arrests were based off of lists made before the attack (Pearl harbor). Essentially, every immigrant NOT naturalized was considered a threat, and many were put in internment camps. Although government actions such as executive order 9066 for FDR was meant primarily for Japanese, many Italians were arrested with these government declarations as justification. In California, the Lt. General John DeWitt sought to intern the entire enemy population of Italians (as well, of course, of japanese), and Italians were unable to travel more than 5 miles from their homes and could not travel at all at night. This ended employment for many Italians and Japanese.

Restrictions like these were never exclusive to the Japanese, and one could assume (based off evidence provided and much more) that most of what the Japanese faced the Italian and German Americans faced as well. The difference was the extent it was imposed. While Italians and Germans faced some arrests, many were placed in internment camps, and stigmatization was apparent, the Japanese faced the worst of it in terms of the quantities incarcerated and the extent of stigmatization.