I believe that what you want to do is this:
public String[] getID(){
    // Create an array of String of length staffNum
    String[] tempArray = new String[staffNum];
    for(int x = 0; x < staffNum; x++){
        // Affect the value Att[x] to each element of my array
        tempArray[x] = String.format("Att[%d]", x);
    }
    return tempArray;
}
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solved Generating different object name with for loop [closed]