
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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![### Question 16
**What is output?**
```java
import java.util.ArrayList;
public class SimpleCar {
@Override
public String toString(){
return "I drive fast";
}
public static void main(String[] args){
ArrayList<Object> myStuff;
myStuff = new ArrayList<Object>();
myStuff.add(new String("Greetings"));
myStuff.add(new Object());
myStuff.add(new SimpleCar());
for(Object item : myStuff){
System.out.println(item.toString());
}
}
}
```
#### Multiple Choice Answers:
- **[ ] String Object SimpleCar**
- **[ ] java.lang.Object@19cc java.lang.Object@23fb java.lang.Object@ab79**
- **[O] java.lang.String@169b java.lang.Object@23fb java.lang.SimpleCar@a42b**
- **[ ] Greetings java.lang.Object@169b I drive fast**
### Explanation
This Java code involves an `ArrayList` of `Object` type, which is populated with various objects, including a `String`, a generic `Object`, and an instance of the `SimpleCar` class. When the program runs, it:
1. Overrides the `toString()` method of the `SimpleCar` class to return "I drive fast".
2. Adds a `String`, an `Object`, and a `SimpleCar` instance to the `ArrayList`.
3. Iterates over the list and prints the `toString()` value of each item.
The correct output will display the default `toString()` values for the `String` and `Object` classes, and the overridden `toString()` for the `SimpleCar` class:
- The `String` object will print `java.lang.String@169b`.
- The `Object` will print `java.lang.Object@23fb`.
- The `SimpleCar` will print `java.lang.SimpleCar@a42b`.](https://content.bartleby.com/qna-images/question/5498129d-fa90-4054-9767-1cffe54599e5/c5ff9b60-5967-44a0-b3bd-bdfb5008bacd/mwpgxuc_thumbnail.jpeg)
Transcribed Image Text:### Question 16
**What is output?**
```java
import java.util.ArrayList;
public class SimpleCar {
@Override
public String toString(){
return "I drive fast";
}
public static void main(String[] args){
ArrayList<Object> myStuff;
myStuff = new ArrayList<Object>();
myStuff.add(new String("Greetings"));
myStuff.add(new Object());
myStuff.add(new SimpleCar());
for(Object item : myStuff){
System.out.println(item.toString());
}
}
}
```
#### Multiple Choice Answers:
- **[ ] String Object SimpleCar**
- **[ ] java.lang.Object@19cc java.lang.Object@23fb java.lang.Object@ab79**
- **[O] java.lang.String@169b java.lang.Object@23fb java.lang.SimpleCar@a42b**
- **[ ] Greetings java.lang.Object@169b I drive fast**
### Explanation
This Java code involves an `ArrayList` of `Object` type, which is populated with various objects, including a `String`, a generic `Object`, and an instance of the `SimpleCar` class. When the program runs, it:
1. Overrides the `toString()` method of the `SimpleCar` class to return "I drive fast".
2. Adds a `String`, an `Object`, and a `SimpleCar` instance to the `ArrayList`.
3. Iterates over the list and prints the `toString()` value of each item.
The correct output will display the default `toString()` values for the `String` and `Object` classes, and the overridden `toString()` for the `SimpleCar` class:
- The `String` object will print `java.lang.String@169b`.
- The `Object` will print `java.lang.Object@23fb`.
- The `SimpleCar` will print `java.lang.SimpleCar@a42b`.
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