So i tried to make a Corona-App for school. My plan is to search every Array in the Arraylist for the ID (which is in the second line of every Array (1;2;3;4)) and check if the value is already existent. The issue is I always activate the else-statement even though the value is in the Array.
import java.util.*;
public class java_prrr {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String[] device1 = {"Samsung","1","true", "Dennis", "0", "8"};
String[] device2 = {"Apple","2","false", "Angela", "6", "4"};
String[] device3 = {"Huawei","3","false", "Fabian", "12", "3"};
String[] device4 = {"Blackberry","4","false", "Chris","3", "16"};
ArrayList<String[]> devices = new ArrayList<String[]>();
devices.add (device1); //0
devices.add (device2); //1
devices.add (device3); //2
devices.add (device4); //3
System.out.println("ID wird abgerufen (manuelle Eingabe)");
String id = sc.nextLine();
for(int i = 0; i < devices.size(); i++){
if(id == devices.get(i)[1]){
System.out.println("Sie sind bereits in der Array aufgelistet.");
}
else{
System.out.println("Geben Sie bitte Ihren Gerätenamen ein:");
String name = sc.nextLine();
System.out.println("Haben Sie Corona? true/false:");
String corona = sc.nextLine();
System.out.println("Wie lautet Ihr Name?");
String besitzer = sc.nextLine();
System.out.println("Koordinaten werden abgerufen (manuelle Eingabe)");
System.out.println("x-Koordinate");
String entfernungx = sc.nextLine();
System.out.println("y-Koordinate");
String entfernungy = sc.nextLine();
String[] Jonas= {name, id, corona,besitzer, entfernungx, entfernungy};
devices.add(Jonas);
System.out.println(devices.get(4));
}
}
}
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