LinkedIn Java Skill Assessment Answers 2022

LinkedIn Java Skill Assessment Answer - Chase2Learn

Q1. Given the string “strawberries” saved in a variable called fruit, what would fruit.substring(2, 5) return?

• rawb
• raw
• awb
• traw

Reasoning: The substring method is accepting two arguments.

• The first argument being the index to start(includes that char at 2)
• and the second the index of the string to end the substring(excludes the char at 5).
• Strings in Java are like arrays of chars.
• Therefore, the method will return “raw” as those are the chars in indexes 2,3, and 4.
• You can also take the ending index and subtract the beginning index from it, to determine how many chars will be included in the substring (5–2=3).

Q2. How can you achieve runtime polymorphism in Java?

• method overloading
• method overrunning
• method overriding
• method calling

Q3. Given the following definitions, which of these expression will NOT evaluate to true?

boolean b1 = true, b2 = false; int i1 = 1, i2 = 2;

• (i1 | i2) == 3
• i2 && b1
• b1 || !b2
• (i1 ^ i2) < 4

Q4. What is the output of this code?

1: class Main {
2:   public static void main (String[] args) {
3:     int array[] = {1, 2, 3, 4};
4:     for (int i = 0; i < array.size(); i++) {
5:        System.out.print(array[i]);
6:     }
7:   }
8: }

• It will not compile because of line 4.
• It will not compile because of line 3.
• 123
• 1234

Q5. Which of the following can replace the CODE SNIPPET to make the code below print “Hello World”?

interface Interface1 {
    static void print() {
        System.out.print("Hello");
    }
}
interface Interface2 {
    static void print() {
        System.out.print("World!");
    }
}

• super1.print(); super2.print();
• this.print();
• super.print();
• Interface1.print(); Interface2.print();

Q6. What does the following code print?

String str = "abcde";
str.trim();
str.toUpperCase();
str.substring(3, 4);
System.out.println(str);

• CD
• CDE
• D
• “abcde”

Q7. What is the result of this code?

class Main {
    public static void main (String[] args){
        System.out.println(print(1));
    }
    static Exception print(int i){
        if (i>0) {
            return new Exception();
        } else {
            throw new RuntimeException();
        }
    }
}

• It will show a stack trace with a runtime exception.
• “java.lang.Exception”
• It will run and throw an exception.
• It will not compile.

Q8. Which class can compile given these declarations?

interface One {
    default void method() {
        System.out.println("One");
    }
}
interface Two {
    default void method () {
        System.out.println("One");
    }
}

• A

class Three implements One, Two {
    public void method() {
        super.One.method();
    }
}

• B

class Three implements One, Two {
    public void method() {
        One.method();
    }
}

• C

class Three implements One, Two {
}

• D

class Three implements One, Two {
    public void method() {
        One.super.method();
    }
}

Q9. What is the output of this code?

class Main {
    public static void main (String[] args) {
        List list = new ArrayList();
        list.add("hello");
        list.add(2);
        System.out.print(list.get(0) instanceof Object);
        System.out.print(list.get(1) instanceof Integer);
    }
}

• The code does not compile.
• truefalse
• truetrue
• falsetrue

Q10. Given the following two classes, what will be the output of the Main class?

package mypackage;
public class Math {
    public static int abs(int num){
        return num < 0 ? -num : num;
    }
}
package mypackage.elementary;
public class Math {
    public static int abs (int num) {
        return -num;
    }
}
import mypackage.Math;
import mypackage.elementary.*;
class Main {
    public static void main (String args[]){
        System.out.println(Math.abs(123));
    }
}

• Lines 1 and 2 generate compiler errors due to class name conflicts.
• “-123”
• It will throw an exception on line 5.
• “123”

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LinkedIn Java Skill Assessment Answer - Chase2Learn