Unit 1
System.out.print(“Happy”);
System.out.println(“Birthday”);
System.out.println(“To You”);
A. Happy
Birthday
To You
B. Happy Birthday
To You
C. HappyBirthday
To You
D. HappyBirthdayTo You
C. HappyBirthday
To You
How should we effectively compare the value of these strings?
name1 = new String(“Jade”)
name2 = new String(“Jade”)
a. System.out.println(name1.equals(name2));
b. System.out.println(name1 == name2);
c. System.out.println(name1 == “Jade”);
a. System.out.println(name1.equals(name2));
What is the result of the following code?
int x = 5;
if (x > 3 && x < 10) {
System.out.println("A");
} else {
System.out.println("B");
}
A. A
B. B
C. Compile-time error
D. Runtime error
A. A
for (int i = 0, i < 5, i++) {
System.out.println(“*”);
}
How many times does loop print the output?
a. 6
b. 5
c. 4
d. 7
b. 5
What is the default in Java?
a. Public
b. Private
c. Package
d. Field
c. package
What does (8/5)*0.5 evaluate to?
A. 1
B. 0.5
C. 2
D. 0.25
B. 0.5
r.nextFloat() returns a
a. A decimal number between 0.0 (excluded) and 1.0 (included)
b. A decimal number between 0.0 (included) and 1.0 (included)
c. A decimal number between 0.0 (included) and 1.0 (excluded)
d. A decimal number between 0.0 (excluded) and 1.0 (excluded)
c. A decimal number between 0.0 (included) and 1.0 (excluded)
Consider the following code:
boolean a = true;
boolean b = false;
if (!a || b) {
System.out.println("X");
} else {
System.out.println("Y");
}
What is the output?
A. X
B. Y
C. Compile-time error
D. Runtime error
B. Y
What is the output of this loop?
for (int i = 0; i < 5; i++) {
System.out.print(i + " ");
}
a) 0 1 2 3 4
b) 1 2 3 4 5
c) 0 1 2 3
d) 1 2 3 4
a) 0 1 2 3 4
Stack memory is used to store ______.
a. Variables, primitives, and references
b. Objects
c. Garbage collection
d. Constructors
a. Variables, primitives, and references
What does
int x = 40;
int y = 70;
System.out.print(x+(x/y));
A. 110
B. 40
C. 70
D. 80
B. 40
(public / static) methods can be invoked through the class name.
static
What is the output of the following code?
int a = 3;
double b = 3.0;
if (a == b && !(a != 3)) {
System.out.println("Equal");
} else {
System.out.println("Not Equal");
}
A. Equal
B. Not Equal
C. Compile-time error
D. Runtime error
A. Equal
int i= a random number such that 1<=i<=n;
for (int a = 2; a <= i; a++){
for (int b = 1; b < i; b++) {
System.out.println("*");
}
}
What is the minimum number of times that * will be printed?
(A) 0
(B) 1
(C) 2
(D) n-1
(E) n-2
B. 1
What is the default value for the boolean data type?
false
What does
double u = 40.8
double f = 70.32;
System.out.println(u*f);
A. 2869.056
B. 0.58
C. Nothing is printed due to an error
D. 2800
C. Nothing is printed due to an error
When comparing primitive types, which of the following operators should be used?
a. equals()
b. ==
c. compareTo()
d. None of the above
b. ==
What will the following code print?
int x = 4, y = 6;
if (x < y) {
if (x % 2 == 0 && y % 2 == 0) {
System.out.println("Even Pair");
} else if (x % 2 != 0 || y % 2 != 0) {
System.out.println("Odd Number Present");
} else {
System.out.println("Neither");
}
} else {
System.out.println("Invalid Range");
}
A. Even Pair
B. Odd Number Present
C. Neither
D. Invalid Range
A. Even Pair
Does the following code produce an infinite loop?
for (int i = 0; i < 10; i++) {
for (int j = 0; j < 5; j++) {
if (i == 5) {
i = 0;
}
}
}
A. Yes, because i resets to 0 indefinitely.
B. No, because the outer loop will eventually stop.
C. Yes, because j never reaches 5.
D. Compilation error.
B. No, because the outer loop will eventually stop.
Which is the proper use of this keyword?
a. // other code //
private String color;
// other code //
public void getColor(String color) {
this.color = color;
}
b. // other code //
private String color;
// other code //
public void setColor(String color) {
this.color = color;
}
c. // other code //
private String color;
// other code //
public void Color(String color) {
this.color = color;
}
d. // other code //
package String color;
// other code //
public void setColor(String color) {
this.color = color;
}
b. // other code //
private String color;
// other code //
public void setColor(String color) {
this.color = color;
}
int a = 1 + 2;
double b = 1.0 + 3.5;
int c = 3 - 5;
double d = 24 * 1.0;
What is the value of d
A. 3
B. 4.5
C. -2
D. 24.0
D. 24.0
Identify the error in this code:
String greeting = "Hello";
System.out.println(greeting.charAt(5));
indexOutOfBounds exception
What is the output of the following program?
public class BooleanTest {
public static boolean test(int a, int b) {
return (a > b) || (a * b < 10);
}
public static void main(String[] args) {
if (test(2, 4)) {
System.out.println("Pass");
} else {
System.out.println("Fail");
}
}
}
A. Pass
B. Fail
C. Compile-time error
D. Runtime error
A. Pass
What is the output?
int[] arr = {2, 4, 6, 8};
for (int i = 0; i < arr.length; i++) {
arr[i] = arr[i] + i;
}
for (int val : arr) {
System.out.print(val + " ");
}
A. 2 4 6 8
B. 2 5 8 12
C. 3 6 9 12
D. 2 5 7 9
B. 2 5 8 12
When a null object contains a field or method that needs to be accessed, the program crashed and throws a ____________ Exception.
NullPointer