Import statement usage in Java - Practice Problems & Coding Challenges

trophy

Challenge - 5 Problems

💻 code output

intermediate

What is the output of this Java code using import?

Consider the following Java code snippet. What will it print when run?

Java

import java.util.ArrayList;

public class Test {
    public static void main(String[] args) {
        ArrayList<String> list = new ArrayList<>();
        list.add("apple");
        list.add("banana");
        System.out.println(list.get(1));
    }
}

A banana

B apple

C Compilation error due to missing import

D Runtime error: IndexOutOfBoundsException

💻 code output

intermediate

What error occurs if import is missing?

What error will this Java code produce if the import statement is removed?

Java

import java.util.HashMap;

public class Test {
    public static void main(String[] args) {
        HashMap<String, Integer> map = new HashMap<>();
        map.put("one", 1);
        System.out.println(map.get("one"));
    }
}

A Compilation error: missing semicolon

B Runtime error: NullPointerException

C Compilation error: cannot find symbol HashMap

D Prints 1

🔧 debug

advanced

Why does this import cause a conflict?

Given the following code, why does it cause a compilation error?

Java

import java.util.Date;
import java.sql.Date;

public class Test {
    public static void main(String[] args) {
        Date d = new Date(0);
        System.out.println(d);
    }
}

A Compilation error due to ambiguous reference to Date

B Prints the current date and time

C Prints 0

D Runtime error: ClassCastException

📝 syntax

advanced

Which import statement is syntactically correct?

Which of the following import statements is correct in Java?

A import java.util.*

B import java.util.*;

C import java.util.*;;

D import java.util

🚀 application

expert

How to use fully qualified class name to avoid import conflict?

You have two classes named List in different packages: java.awt.List and java.util.List. You want to use both in the same file without import statements. How do you declare variables of each type?

A import java.awt.List; import java.util.List; List awtList; List utilList;

B List awtList = new List(); List utilList = new List();

C java.awt.List awtList = new List(); java.util.List utilList = new ArrayList();

D java.awt.List awtList = new java.awt.List(); java.util.List<String> utilList = new java.util.ArrayList<>();