I just tested your code. Its working fine. no error I am getting output PC
public class StackOverFlow {
 public static String[] CONSOLES = {
            "PC",
            "PS4",
            "XBOX ONE",
            "PS VITA"
        };
 public static void main(String arg[]){
    System.out.println(getConsoleName(0));
} 
public static String getConsoleName(int ID)
{
    String rtext = "unknown";
    try {
        rtext = CONSOLES[ID];
    } catch (Exception e) {
        System.err.println(e);
    }
    return rtext;
}   
}
If you are getting NullPointerException , please give complete code with main method to see where from it occurs.
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solved NullPointerException When trying to get string element from array