Kindly check the below code, This is showing some warning,
ArrayList<String[]> may not contain objects of String
ArrayList<String[]> mName = new ArrayList<>();
mValue = "John";
if (!mName.contains(mValue)) {
String[] details = new String[]{"Driver", "Part-time"};
mName.add(details);
}
Your if condition returns false because String[] and String are different types, so the equals method of String class will always return false. You must rethink your code. Please look also at this similar question: Using contains on an ArrayList with integer arrays
You have created ArrayList of String[] or String arrays. But you are checking that if ArrayList<String[]> mName contains a string. Java won't allow it. In this case you can check that your ArrayList cantains any String[] or not. So, if you want to check that string "John" is in the ArrayList then change
ArrayList<String[]> mName = new ArrayList<>();
to
ArrayList<String> mName = new ArrayList<>();
If you want to keep your previous code then change mValue to String array. Change
mValue = "John"
to
String[] mValue = new String[]{"John"};
N.B: mValue = "John" this line is missing a ;
if (!mName.contains(mValue)) {it contains String Arrays, so how can this work?ListofString[]can't haveStrings? the error tells you exactly what is wrong, read it