java quiz

Authored by Giri A

Computers

University

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10 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

public class Main {
    public static void main(String[] args) {
        int[] arr = {10, 20, 30, 40, 50};
        int index = 2;
        System.out.println(arr[index + 1]);
    }
}

Systax error

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

public class Main {
    public static void main(String[] args) {
        String str = “Hello, world!”;
        System.out.println(str.length());
    }
}

Undefined behavior

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

public class Main {
    public static void main(String[] args) {
        int[] Arr = new int[3];
        Arr[1] = 10;
        Arr[2] = 20;
        Arr = null;
        System.out.println(arr[2]);
    }
}

NullPointerException

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

public class Main {
    public static void main(String[] args) {
        int[] arr = new int[10];
          Arr = null;
        Arr[0] = 5;
        System.out.println(arr[0]);
    }
}
What will happen?

It will print 5.

It will print 0

It will throw a NullPointerException

It will cause a compilation error.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

public class Main {
    public static void main(String[] args) {
        int x = 5; // Binary: 0101
        x= x << 1;
        System.out.println(x);
    }
}

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

public class Main {
    static class Person {
        String name;
        int age;
        Person(String name, int age) {
            this.name = name;
            this.age = age;
        }
    }
    public static void main(String[] args) {
        Person[] persons = {new Person(“John”, 25), new Person(“Jane”, 30)};
        System.out.println(persons[1].age);
    }
}

persons[1].name

persons[0].age

persons[1].age

persons[0].name

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

public class Main {
    public static void main(String[] args) {
        int I = 0;
        while (I >= 0) {
            System.out.print(I + “ “);
        }
    }
}

The loop will terminate after one iteration

The loop will run forever.

The loop will run 0 iterations.

It will cause an exception

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java quiz

public class Main {
    public static void main(String[] args) {
        int[] arr = {10, 20, 30, 40, 50};
        int index = 2;
        System.out.println(arr[index + 1]);
    }
}

public class Main {
    public static void main(String[] args) {
        String str = “Hello, world!”;
        System.out.println(str.length());
    }
}

public class Main {
    public static void main(String[] args) {
        int[] Arr = new int[3];
        Arr[1] = 10;
        Arr[2] = 20;
        Arr = null;
        System.out.println(arr[2]);
    }
}

public class Main {
    public static void main(String[] args) {
        int[] arr = new int[10];
          Arr = null;
        Arr[0] = 5;
        System.out.println(arr[0]);
    }
}
What will happen?

public class Main {
    public static void main(String[] args) {
        int x = 5; // Binary: 0101
        x= x << 1;
        System.out.println(x);
    }
}

public class Main {
    public static void main(String[] args) {
        int I = 0;
        while (I >= 0) {
            System.out.print(I + “ “);
        }
    }
}

public class Main {
    public static void changeValue(int x) {
        x=10;
    }
    public static void main(String[] args) {
        int num = 5;
        changeValue(num);
        System.out.println(num);
    }
}

public class Main {
    public static void main(String[] args) {
        int x = 5;
        x = x ^ 3;
        System.out.println(x);
    }
}

public class Main {
    public static void func() {
        int x = 5;
        System.out.print(x + “ “);
        x++;
    }
    public static void main(String[] args) {
        func();
        func();
        func();
    }
}

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java quiz

public class Main { public static void main(String[] args) { int[] arr = {10, 20, 30, 40, 50}; int index = 2; System.out.println(arr[index + 1]); }}

public class Main { public static void main(String[] args) { String str = “Hello, world!”; System.out.println(str.length()); }}

public class Main { public static void main(String[] args) { int[] Arr = new int[3]; Arr[1] = 10; Arr[2] = 20; Arr = null; System.out.println(arr[2]); }}

public class Main { public static void main(String[] args) { int[] arr = new int[10]; Arr = null; Arr[0] = 5; System.out.println(arr[0]); }}What will happen?

public class Main { public static void main(String[] args) { int x = 5; // Binary: 0101 x= x << 1; System.out.println(x); }}

public class Main { static class Person { String name; int age; Person(String name, int age) { this.name = name; this.age = age; } } public static void main(String[] args) { Person[] persons = {new Person(“John”, 25), new Person(“Jane”, 30)}; System.out.println(persons[1].age); }}

public class Main { public static void main(String[] args) { int I = 0; while (I >= 0) { System.out.print(I + “ “); } }}

public class Main { public static void changeValue(int x) { x=10; } public static void main(String[] args) { int num = 5; changeValue(num); System.out.println(num); }}

public class Main { public static void main(String[] args) { int x = 5; x = x ^ 3; System.out.println(x); }}

public class Main { public static void func() { int x = 5; System.out.print(x + “ “); x++; } public static void main(String[] args) { func(); func(); func(); }}

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public class Main {
public static void main(String[] args) {
int[] arr = {10, 20, 30, 40, 50};
int index = 2;
System.out.println(arr[index + 1]);
}
}

public class Main {
public static void main(String[] args) {
String str = “Hello, world!”;
System.out.println(str.length());
}
}

public class Main {
public static void main(String[] args) {
int[] Arr = new int[3];
Arr[1] = 10;
Arr[2] = 20;
Arr = null;
System.out.println(arr[2]);
}
}

public class Main {
public static void main(String[] args) {
int[] arr = new int[10];
Arr = null;
Arr[0] = 5;
System.out.println(arr[0]);
}
}
What will happen?

public class Main {
public static void main(String[] args) {
int x = 5; // Binary: 0101
x= x << 1;
System.out.println(x);
}
}

public class Main {
static class Person {
String name;
int age;
Person(String name, int age) {
this.name = name;
this.age = age;
}
}
public static void main(String[] args) {
Person[] persons = {new Person(“John”, 25), new Person(“Jane”, 30)};
System.out.println(persons[1].age);
}
}

public class Main {
public static void main(String[] args) {
int I = 0;
while (I >= 0) {
System.out.print(I + “ “);
}
}
}

public class Main {
public static void changeValue(int x) {
x=10;
}
public static void main(String[] args) {
int num = 5;
changeValue(num);
System.out.println(num);
}
}

public class Main {
public static void main(String[] args) {
int x = 5;
x = x ^ 3;
System.out.println(x);
}
}

public class Main {
public static void func() {
int x = 5;
System.out.print(x + “ “);
x++;
}
public static void main(String[] args) {
func();
func();
func();
}
}