Exam1Practice
Java代考推荐 If you wish to store an int value in a double variable, Java will automatically convert the int value into a double.
1.Whichof the following are correct about java?
A.Java compiler converts the source code to byte code B.Java Virtual Machine uses the byte code to run the code C.JVM uses the .class file to run the code
D.Java compiler creates a .class file containing byte codes
E.Source code can be run by using Java Virtual Machine
2.WhichJava statement does not contain an error? Java代考推荐 A.System.out.print(“My name is” + ” “);
B.System.out.print(“My name is”, ” Mary.”); C.System.out.print(My name is + ” Mary.”);
D.System.out.print(My name is Mary);
3.Which of the following arecorrect?
A.A class without a main method can be compiled B.A class without a main method cannot be run
C.A class without a main method cannot be compiled D.A class without a main method can be run
4.Whichof the following best describes the structure of a Java program?
A. A class that contains multiple methods
B.A method that contains multiple classes
C.A class that contains multiple classes
D.A method that contains multiple methods
5.Whichof the following are acceptable variable names?
A.numStudents
B.num2Var
C.1num
D.buffer_
E.public
6.Whatis the output of this code snippet? Java代考推荐
int num = 22;
int sum = num + 2; System.out.print(sum); // sum = sum + 4; num += 1;
System.out.print(sum);
A.2424
B.2425
C.2224
D.2525
7.Howmany primitive data type dos java have? Java代考推荐
A.8
B.7
C.9
D.6
8.Ifyou wish to store an int value in a double variable, Java will automatically convert the int value into a double.
T.True
F.False
9.Whatline number is first highlighted by the compiler as containing an error?
1 public class Exam{
2 publicstatic void main(String[] args) {
3
4 String a =”3″;
5 String c = a +”3″;
6 intd = c + 1;
7
8 System.out.println(d); Java代考推荐
9
10 }
11 }
A.6
B.5
C.4
D.8
10.Whatline number is first highlighted by the compiler as containing an error?
1 public class Exam{
2 publicstatic void main(String[] args) {
3
3 int x = (byte)1;
4 double y = (int)1;
5 float z = (double)3;
7
8 System.out.println(x + y + z);
9
10 }
11 }
A.6
B.4
C.8
D.5
11.Whatline number is first highlighted by the compiler as containing an error? Java代考推荐
1 public class Exam{
2 publicstatic void main(String[] args) {
3
4 Scanner keyboard = newScanner(System.in);
5 int price =nextInt();
6 StringisRight = “$” + price;
7
8 System.out.println(isRight);
9
10 }
11 }
A.4
B,5
C.6
D.8
12.Whatline number is first highlighted by the compiler as containing an error? Java代考推荐
1 import java.util.Scanner;
2 public class Exam {
3 public static void main(String[] args){
4 int total =0;
5
6 ScannerfileReader = new Scanner(new File(“Testing.txt”));
7 int total =nextInt();
8 String counter =total;
9
10 System.out.println(total);
11
12 }
13 }
A.6
B.7
C.8
D.10
13.Givena Scanner named keyboard (already declared and initialized), write a single line of code that will allow the user to enter the name of a country, and store the result in an appropriate variable (not yet declared). Java代考推荐
14.Definea constant variable to hold the population of the world: 7,794,798,739
15.Fromthe following expression, which part will get run first: 2 + a * 2 / b – 1;
A.a * 2
B.2 + a
C.2 / b
D.b – 1
16.What value will be saved inside the variable num:
intnum;
num = 2 / 5;
A.0
B.2.5
C.Compile error
D.1
17.What’sthe result of the following code:
int num = 23;
System.out.println((num % 10) + (num / 10));
A.5
B.3
C.2
D.23
18.What’s the result of the followingcode:
System.out.println(“\\\”////\\//\”/”);
A.\”////\//”/
B.\\\”//\//\”/
C.Compile error
D.\\”////\\/\”/
19.What value will be saved inside the variable num:
double num = 4 /2;
20.Whatvalue will be printed on the display:
System.out.println(2.0 * (int) 5);
A.4.0
B.4
C.Compile error
D.5.0
21.What value will be printed on the display: System.out.println(312312312312 %2); Java代考推荐
A.0
B.1
C.Compile error
D.It’s hard to calculate without a calculator
22.Writea simple Java program that will prompt a user to enter 1 integer value and 1 double value, calculate the product of those two values, and print the result with an appropriate message. Be careful to import the necessary packages. (product is the answer to a multiplication problem)
23.Youare writing a program to help determine the cost to build a Your program should…
*Askthe user for 3 inputs: the length and width of the area to be fenced and the price of the material (assume whole dollars) Java代考推荐
*Calculate the total cost of the fence.
*cost= 2 (l + w) * p
*Printthe length, width, and total cost of the fence, all on one line, neatly formatted to the console.
*Useproper naming conventions, style, and programming practices in your solution.
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