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CompareObjects.java

src/main/java/Item.java
 
import java.util.Objects;
 
public class Item {
 
    private String identifier;
    private String name;
 
    public Item(String identifier, String name) {
        this.identifier = identifier;
        this.name = name;
    }
 
    public String getIdentifier() {
        return identifier;
    }
 
    public String getName() {
        return name;
    }
 
    @Override
    public String toString() {
        return this.identifier + ": " + this.name;
    }
 
    // This method was automatically created with the "insert code" function of Netbeans
    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final Item other = (Item) obj;
        if (!Objects.equals(this.identifier, other.identifier)) {
            return false;
        }
        return true;
    }
 
}
 

src/main/java/Main.java
 
import java.util.ArrayList;
import java.util.Scanner;
 
public class Main {
 
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
 
        ArrayList<Item> items = new ArrayList<>();
 
        while (true) {
            System.out.println("Identifier? (empty will stop)");
            String identifier = scanner.nextLine();
            if (identifier.isEmpty()) {
                break;
            }
 
            System.out.println("Name? (empty will stop)");
            String name = scanner.nextLine();
            if (name.isEmpty()) {
                break;
            }
 
            Item item = new Item(identifier, name);
 
            if (!items.contains(item)) {
                items.add(item);
            }
        }
 
        System.out.println("==Items==");
        for (Item item : items) {
            System.out.println(item);
        }
 
    }
}