How to match the position of two array?

Question

for example

I have two arrays...

and I want to print if the position of first array matches the position of another array, then the value from that particular array.

example:

String[] names = {"Oxygen","Nitrogen","Carbon","Hydrogen"};

String[] chemical = {"O2","N2","C","H");

Scanner input = new Scanner(System.in);

System.out.println("Enter Your Chemical ");
String myChem = input.nextLine();

//for(int i = 0; i < names.length; i++){
//System.out.println(chemical[i]);
//}

output if oxygen then o2

Answer 1

Thats why Maps exist

-------------
//Creating a Map
Map<KeyType, ValueType> mapName = new HashMap<>();

//Adding data
mapName.put(Key, Value);

//Getting the value
mapName.get(Key); //Returns the value of that key

-------------

Map<String, String> map = new HashMap<>();

map.put("Oxygen", "O2");
map.put("Nitrogen", "N2");
map.put("Carbon", "C");
map.put("Hydrogen", "H");

Scanner input = new Scanner(System.in);
System.out.print("Enter your chemical: ");

String myChem = input.nextLine();

System.out.println(map.get(myChem));

Answer 2

yes it will

Answer 3

You can do it like this

//Notice the lower case
map.put("oxygen", "o2");
map.put("nitrogen", "n2");
map.put("carbon", "c");
map.put("hydrogen", "h");

Scanner input = new Scanner(System.in);
System.out.print("Enter your chemical: ");

String myChem = input.nextLine();

//Then use a for loop like this, notice toLowerCase()
for (Map.Entry<String, String> m : map.entrySet()){
if (m.getValue().equals(myChem.toLowerCase())){
System.out.println(m.getKey().toUpperCase());
}else if (m.getKey().equals(myChem.toLowerCase())) {
System.out.println(m.getValue().toUpperCase());
}
}

Answer 4

Look at the example

https://code.sololearn.com/c8g2iRO27DYg/#java

Answer 5

I would also suggest to use o_2 and n_2 because you sometimes things like o^+_2

Answer 6

If you don't want to use map you can use this code:
for(int i=0;i<names.length;i++){
if(names[i].equals(myChem))
System.out.println(chemical[i])
}

Answer 7

Along with mapping you can also utilize multi-dimensional arrays. Very similar.

Answer 8

@uran will this work like if I type o2 or o.. then it will print oxygen??

Answer 9

thanx bhaijaan it worked.. love u

Answer 10

you don't need to use Hashmap. You can do it with few line of codes. Here http://www.sololearn.com/app/sololearn/playground/c7TZ1iCxxcQq/

Answer 11

@MohammadAmin The Code isn't working