Convert contents of Array List to String

Question

I'm new to Java and I've been trying to turn this Array list of Terms (Letters and Numbers) into a String, (unless its 1, in which case the program should ignore the element).

Is this the proper way to go about accomplishing this or should I use a different method?

My code is as follows:

public String display() {

    for (int i = 0; i < terms.size(); i++) {

        char p = terms.get(i);

        if(Character.isDigit(p = 1)) {
            continue;
        } else if (Character.isDigit(p)) {
            return String.valueOf(p);
        } else {
            return Character.toString(p);
        }
    }

    p = display(); 
    return display();
}

Note: I know this is wrong - I just need someone to point me in the right direction.

Input Example: {Term('C', 1),Term('O',2)} would give "CO2"

Where is terms defined? What is its specific type? Is it a List of generic type? If so, which type? — Ori Lentz
– Ori Lentz, Commented Apr 11, 2016 at 6:50
@Alfred : please share the complete code and expected input and output — Naman
– Naman, Commented Apr 11, 2016 at 6:53

Teddy · Accepted Answer · 2016-04-11 07:09:37Z

1

Assuming your Term is some custom class like below (based on the sample input you have mentioned):

public class Term{
    private String element;
    private int number;
    public String getElement(){
        return element;
    }
    public void setElement(char element){
        this.element = element;
    }
    public int getNumber(){
        return number;
    }
    public void setNumber(int number){
        this.number = number;
    }
}

Your concatenation method can be something like this:

public String display() {

    StringBuilder sb = new StringBuilder(50);
    for (int i = 0; i < terms.size(); i++) {
        Term p = terms.get(i);
        sb.append(p.getElement());
        if(p.getNumber()!=1) {
            sb.append(p.getNumber());
        } 
    }

    return sb.toString();
}

answered Apr 11, 2016 at 7:09

Teddy

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Comments

Musaddique S · Accepted Answer · 2016-04-11 07:05:48Z

you can try this

import java.util.ArrayList;
import java.util.List;

public class TestSkack {
    public static void main(String[] args) {

        List<KeyValue> terms=new ArrayList<>();

        terms.add(new KeyValue('C', 1));
        terms.add(new KeyValue('O', 2));
        System.out.println(display(terms));

    }

    public static String display(List<KeyValue> terms){
        String result="";
        for(KeyValue keyValue:terms){
            if(keyValue.getValue()==1)
                result+=keyValue.getKey();
            else
                result+=String.valueOf(keyValue.getKey())+keyValue.getValue();
        }
        return result;
    }
}

class KeyValue{
    Character key;
    Integer value;


    public KeyValue(Character key, Integer value) {
        super();
        this.key = key;
        this.value = value;
    }
    public Character getKey() {
        return key;
    }
    public void setKey(Character key) {
        this.key = key;
    }
    public Integer getValue() {
        return value;
    }
    public void setValue(Integer value) {
        this.value = value;
    }


}

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