Java Data Structures Exercises – ArrayList

What is the output of this code?

                import java.util.ArrayList;

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

    ArrayList userPermissions = new ArrayList<>();

    userPermissions.add("Read");
    userPermissions.add("Write");
    userPermissions.add("Delete");
    userPermissions.add("Publish");

    int index = 3;
    System.out.println(userPermissions.get(index));
  }
}

Publish Delete

Display the first permission of the ArrayList.

                import java.util.ArrayList;

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

    ArrayList userPermissions = new ArrayList<>();

    userPermissions.add("Read");
    userPermissions.add("Write");
    userPermissions.add("Delete");
    userPermissions.add("Publish");

    int index = "";
    System.out.println(userPermissions.get(index));
  }
}

What is the output of this Java program?

                import java.util.ArrayList;

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

    ArrayList userPermissions = new ArrayList<>();

    userPermissions.add("Read");
    userPermissions.add("Write");
    userPermissions.add("Delete");
    userPermissions.add("Publish");

    int index = 4;
    System.out.println(userPermissions.get(index));
  }
}

Publish It encounters with an error

What is the output of this Java program?

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

    ArrayList products = new ArrayList<>();

    products.add("Widget A");
    products.add("Gadget B");
    products.add("Accessory C");
    products.add("Tools D");
    
    System.out.println(products);
  }
}

It encounters with an error [Widget A, Gadget B, Accessory C, Tools D]

Remove Accessory C from the ArrayList.

                import java.util.ArrayList;

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

    ArrayList products = new ArrayList<>();

    products.add("Widget A");
    products.add("Gadget B");
    products.add("Accessory C");
    products.add("Tools D");

    ""
    
    System.out.println(products);
  }
}

remove products . (2) (3) ;

Update Product C to Product X .

                import java.util.ArrayList;

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

    ArrayList inventory = new ArrayList<>();
    inventory.add("Product A");
    inventory.add("Product B");
    inventory.add("Product C");
    inventory.add("Product D");

    inventory.""(2, "Product X");
    
    System.out.println(inventory);
  }
}

Waht is the output of this code?

                import java.util.ArrayList;

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

    ArrayList inventory = new ArrayList<>();
    inventory.add("Product A");
    inventory.add("Product B");
    inventory.add("Product C");
    inventory.add("Product D");
    inventory.add("Product E");
    inventory.add("Product F");

    int index = inventory.size() - 1;
    
    System.out.println(inventory.get(index));
  }
}

Product F Product E

What is the output of this code?

                import java.util.ArrayList;

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

    ArrayList inventory = new ArrayList<>();
    inventory.add("Product A");
    inventory.add("Product B");
    inventory.add("Product C");
    inventory.add("Product D");
    inventory.add("Product E");
    inventory.add("Product F");
    inventory.add("Product G");
    inventory.add("Product H");

    int index = inventory.size() - 2;
    
    System.out.println(inventory.get(index));
  }
}

Product H Product G

Waht is the output of this Java program?

                import java.util.ArrayList;

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

    ArrayList inventory = new ArrayList<>();
    inventory.add("Product A");
    inventory.add("Product B");
    inventory.add("Product C");
    inventory.add("Product D");

    inventory.clear();
        
    System.out.println(inventory);
  }
}

0 [ ]

What is the output of this Java program?

                import java.util.ArrayList;

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

    ArrayList inventory = new ArrayList<>();
    inventory.add("Product A");
    inventory.add("Product B");
    inventory.add("Product C");
    inventory.add("Product D");

    inventory.clear();
        
    System.out.println(inventory.size());
  }
}

0 It encounters with an error

Java Exercises for Data Structures

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Behnam Khani

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Java Data Structures Exercises – ArrayList

Java Exercises for Data Structures