How to get the minimum value of a product using minimum function?

Question

 my data1=[{"iphone6","16000"},{"iphone7","17000"},{"iphone8","10000"}]

i want my output as iphone8 ,10000 but it giving exception Index 0 out of bounds for length 0 error

     public String getMinLaptopPrice(ArrayList<String[]> data) {
           //min value 
              String min = data.get(0)[1];
              for(int i=0;i<data.size();i++) {
               String cur = data.get(i)[1];

            int S = cur.compareTo(min);
             if(S>0) {
                 min = cur;
              }
             }
            return min;
          }

Answer 1

You are using the wrong compare method,for int value,you can compare the value directly

public String getMinLaptopPrice(ArrayList<String[]> data) {
     int s = Integer.parseInt(data.get(0)[1]);
     String min = data.get(0)[0];
     for(int i=1;i<data.size();i++) {
        int value = Integer.parseInt(data.get(i)[1]);//convert string to int vlaue
        if(value<s) {
            min = data.get(i)[0];
            s= value;
        }
     }
     return min;
}

Answer 2

The reason for the Exception is the initialization of the min variable. Set it to Integer.MAX_VALUE and parse the data. On zero length arrays you can't access the data.

Generally

• Finding minimum: init at max value

• Finding maximum: init at min value

• Check array size ahead of accessing.

Answer 3

you can try this code

public Integer getMinLaptopPrice(ArrayList<String[]> data) { 
        int min = Integer.valueOf(data.get(0)[1]);
        for (int i = 0; i < data.size(); i++) {
            int cur = Integer.valueOf(data.get(i)[1]); 
            if (cur < min) {
                min = cur;
            }
        }
        return min;
    }

in your code, you try to compare two string Object instead of there value... so i convert all amount data into Integer and compare minimum value by if condition... and also change method return type to Integer ...

Answer 4

import java.util.ArrayList;

public class Main {
    public static void main(String[] args) {
        String[] d1 = {"iphone6","16000"};
        String[] d2 = {"iphone7","17000"};
        String[] d3 = {"iphone8","10000"};
        ArrayList<String[]> data1=new ArrayList<>();
        data1.add(d1);
        data1.add(d2);
        data1.add(d3);
        String[] d = getMinLaptopPrice(data1);
        System.out.print(d[0] + ", " + d[1]);
    }

    public static String[] getMinLaptopPrice(ArrayList<String[]> data) {
        int value_min = Integer.parseInt(data.get(0)[1]);
        String key_min = "";
        for(int i = 1; i < data.size(); i++) {
            int value = Integer.parseInt(data.get(i)[1]);
            if (value < value_min) {
                value_min = value;
                key_min = data.get(i)[0];
            }
        }
        String[] d = {key_min, String.valueOf(value_min)};
        return d;
    }
}

and the output is:

iphone8, 10000