Question

1. What is the output when you run printIn()?
public static void main(String[] args)
{
if (true) {
int num = 1;
if (num > 0) {
num++;
}
}
int num = 1;
addOne(num);
num = num - 1
System.out.println(num);
}
public void addOne(int num)
{
num = num + 1;
}
2. When creating an array for primitive data types, the default values are:
a. Numeric type
b. Char type
c. Boolean type
d. String type
e. Float type
3. Create an array of 15 float numbers.
4. Syntax of foreach loop with an example.
5. Copy the content of array myarray1 = {1,2,3} into new array myarray2.
6. Complete the highlighted parts in below code:
public static ___ addOneToEach(int[] list) {
int[] result = new int[list.length];

for (int i = 0; i < list.length; i++)
result[i] = ___ + 1;
return result;
}
7. How to calculate the row and column of two-dimensional array.
8. Complete the highlighted code for printing two-dimensional array:
for (int row = 0; row < ____; row++) {
for (int col = 0; col < ____; col++)
9. Complete the following for method definition of passing 2D array:
public static void methodExample(__) {
// Method body
}
10. Answer below:
a. Constructors are invoked using ________ operator when an object is created.
b. They need a void return type. - True or False?
11. Syntax and examples of constructor(with and without parameter).
12. What does a default constructor provide?
13. How do you invoke a method in an object?
14. Difference between a and b:
Circle myCircle1 = new Circle();
Circle myCircle2;
a. myCircle2 = myCircle1;
b. myCircle2 = new Circle();
15. ____________ is shared by all objects of a class and is not tied to a specific instance.
16. What will the output when function updatePi() is called?
class newIde
{
public static final int PI = 3.14159;
public static double updatePi() {
PI = PI * 7;
return PI;
}
}
17. If a data field is private, how will other classes use it?
18. A keyword which is used to refer to the object itself.
19. Complete the highlighted code.
class Circle {
private double radius;
...
public double setRadius(double radius) {
________ = radius;
}
}
20. What will be the output of the following program?
public class Rose {
public Rose(String name) {
System.out.println("Passed Name is :" + name);
}
public static void main(String[] args) {
Rose myRose = new Rose("red");
myRose = new Rose("white");
}
}
21. What will be the output of the following program?
public class Counter {
Static int count = 0;
Counter() {
count++;
}
public static void main(String srt[]) {
Counter c1 = new Counter();
Counter c3 = new Counter();
Counter c2 = new Counter();
System.out.print(c1.count + ", ");
System.out.print(c2.count + ", ");
System.out.print(c3.count);
}
}
a. 1,1,1
b. Compilation or runtime error
c. 3,3,3
d. 1,2,3
22. What will be the output of the following program?
public class NewClass2
{
public static void main(String[] args)
{
int ar[] = {1, 2, 3, 4, 5};
for (int i=0; i<=ar.length; i++)
System.out.println(ar[i]);
}
}
a. 1,2,3,4,5 with runtime error
b. Runtime error
c. 1,2,3,4,5
d. 2,3,4,5

Answer 1

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3. Create an array of 15 float numbers.

float [] a= new float[15];

6. Complete the highlighted parts in below code:
public static [] int addOneToEach(int[] list) {
int[] result = new int[list.length];

for (int i = 0; i < list.length; i++)
result[i] =result[i] + 1;
return result;
}

7)

How to calculate the row and column of the two-dimensional array.

let the array is a

int row = a.length;

int column= a[0].length;