Arraylist - String/Double

Question

I am taking a basic objects first with java class, i don't know much yet and need a little help .. I need to assign these values to an arraylist but also need to allow the user to choose a health option based on a string that will then output the value related to the option..

double [] healthBenDesig = new double [5];
double [] healthBenDesig = {0.00, 311.87, 592.56, 717.30, 882.60};

Strings I want to assign are:

none = 0.00
employeeOnly = 311.87
spouse = 592.56
children = 717.30
kids = 882.60

Ultimately, I want the user to input for example "none" and the output will relate none to the value held in the arraylist [0] slot and return that value. Is this possible? Or is there an easier way I am overlooking?

if anyone could help me out I would really appreciate it :) Thanks

If the values are compile time constants then use an enum to store them. Otherwise use a Map. — Boris the Spider
– Boris the Spider, Commented Apr 4, 2014 at 5:38

Aniket Kulkarni · Accepted Answer · 2014-04-04 05:38:37Z

6

Yes. This is possible with HashMap.

HashMap<String,Double> healthMap = new HashMap<String,Double>();
healthMap.put("none",0.00);
healthMap.put("employeeOnly",311.87);
healthMap.put("spouse",592.56);
healthMap.put("children",717.30);
healthMap.put("kids",882.60);

Now, when user enters none then use get() method on healthMap to get the value.

For safety check that key exists in map using containsKey() method.

if(healthMap.containsKey("none")) {
   Double healthVal = healthMap.get("none"); //it will return Double value
} else {
  //show you have entered wrong input
}

Comments

Ruchira Gayan Ranaweera · Accepted Answer · 2014-04-04 05:39:11Z

0

Best solution is Map<String, Double>.

Map<String,Double> map=new HashMap<>();
map.put("none",0.0);

Now when you want the value for "none" you can use get() method

map.get("none") // will return 0.0

answered Apr 4, 2014 at 5:39

Ruchira Gayan Ranaweera

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Comments

Pankaj Gadge · Accepted Answer · 2014-04-04 05:40:57Z

0

Here's something for you to get started with since it's the assignment:

Create a Map<String, Double> that holds the number and string as key/value pair.
Store the above values into the map
When a user enters the input, capture it using Scanner

Do something like this.

if(map.containsKey(input)) {
     value = map.get(input);
}

answered Apr 4, 2014 at 5:40

Pankaj Gadge

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1 Comment

Boris the Spider Over a year ago

Why lookup in the map twice? containsKey has a special usage related to null values mapped to keys. Here you can just get and then check for null.

Nidhish Krishnan · Accepted Answer · 2014-04-04 05:42:45Z

0

Use Map Inteface

Map<String, Double> healthBenDesig =new HashMap<String, Double>();
healthBenDesig.put("none", 0.00);
healthBenDesig.put("employeeOnly", 311.87);
healthBenDesig.put("spouse", 592.56);
healthBenDesig.put("children", 717.30);
healthBenDesig.put("kids", 882.60);

System.out.println(healthBenDesig);

OutPut

{
none = 0.0, 
spouse = 592.56, 
children = 717.3, 
kids = 882.6, 
employeeOnly = 311.87
}

answered Apr 4, 2014 at 5:42

Nidhish Krishnan

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