Basics, Java

Question: To run a java file from command prompt we write-
A
java class_name

B
javac class_name

C
class_name

D
javac

Note: Not available
1. Report
Question: Which of the following values can you assign to a variable of type int?
A
10.55

B
'S'

C
True

D
0

Note: Not available
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Question: Which of the following data types can store a value in the least amount of memory?
A
short

B
long

C
int

D
byte

Note: Not available
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Question: A Boolean value can hold the values true and false.
A
True

B
False

Note: Not available
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Question: What will be the output of the following java program?

class Adds{

   public static void main(String args[]){

   int x = 20;
   int y = 10;
   int z = x + y;

   System.out.println(" The addition of " + x + " and " + y + " is " + z);

}
}
A
20

B
10

C
30

D
40

Note: Not available
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Question: Which one is the correct structure for declaring a method within a class?
A
class Hello{

public static void amin(String args[]){

System.out.println("Hello World !!");

}
}

B
class Hello{

System.out.println("Hello World !!")

}

C
class Hello{

public static void amin{String args[]}(

System.out.println("Hello World !!");

)
}

D
class Hello{

}

Note: Not available
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Question: A method must include the following -
A
A diclaration

B
An opening curly brace

C
A leg

D
A body

E
A closing curly brace

Note: Not available
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Question: Which four options describe the correct default values for array elements of the types indicated? 1. int -> 0 2. String -> "null" 3. Dog -> null 4. char -> '\u0000' 5. float -> 0.0f 6. boolean -> true
A
1, 2, 3, 4

B
1, 3, 4, 5

C
2, 4, 5, 6

D
3, 4, 5, 6

Note: (1), (3), (4), (5) are the correct statements. (2) is wrong because the default value for a String (and any other object reference) is null, with no quotes. (6) is wrong because the default value for boolean elements is false.
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Question: Which one of these lists contains only Java programming language keywords?
A
class, if, void, long, Int, continue

B
goto, instanceof, native, finally, default, throws

C
try, virtual, throw, final, volatile, transient

D
strictfp, constant, super, implements, do

E
byte, break, assert, switch, include

Note: All the words in option B are among the 49 Java keywords. Although goto reserved as a keyword in Java, goto is not used and has no function. Option A is wrong because the keyword for the primitive int starts with a lowercase i. Option C is wrong because "virtual" is a keyword in C++, but not Java. Option D is wrong because "constant" is not a keyword. Constants in Java are marked static and final. Option E is wrong because "include" is a keyword in C, but not in Java.
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Question: Which will legally declare, construct, and initialize an array?
A
int [] myList = {"1", "2", "3"};

B
int [] myList = (5, 8, 2);

C
int myList [] [] = {4,9,7,0};

D
int myList [] = {4, 3, 7};

Note: The only legal array declaration and assignment statement is Option D Option A is wrong because it initializes an int array with String literals. Option B is wrong because it use something other than curly braces for the initialization. Option C is wrong because it provides initial values for only one dimension, although the declared array is a two-dimensional array.
1. Report

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Question: To run a java file from command prompt we write-

Question: Which of the following values can you assign to a variable of type int?

Question: Which of the following data types can store a value in the least amount of memory?

Question: A Boolean value can hold the values true and false.

Question: What will be the output of the following java program?

class Adds{

   public static void main(String args[]){

   int x = 20;
   int y = 10;
   int z = x + y;

   System.out.println(" The addition of " + x + " and " + y + " is " + z);

}
}

Question: Which one is the correct structure for declaring a method within a class?

Question: A method must include the following -

Question: Which four options describe the correct default values for array elements of the types indicated? 1. int -> 0 2. String -> "null" 3. Dog -> null 4. char -> '\u0000' 5. float -> 0.0f 6. boolean -> true

Question: Which one of these lists contains only Java programming language keywords?

Question: Which will legally declare, construct, and initialize an array?

Question: To run a java file from command prompt we write-

Question: Which of the following values can you assign to a variable of type int?

Question: Which of the following data types can store a value in the least amount of memory?

Question: A Boolean value can hold the values true and false.

Question: What will be the output of the following java program?class Adds{ public static void main(String args[]){ int x = 20; int y = 10; int z = x + y; System.out.println(" The addition of " + x + " and " + y + " is " + z); }}

Question: Which one is the correct structure for declaring a method within a class?

Question: A method must include the following -

Question: Which four options describe the correct default values for array elements of the types indicated? 1. int -> 0 2. String -> "null" 3. Dog -> null 4. char -> '\u0000' 5. float -> 0.0f 6. boolean -> true

Question: Which one of these lists contains only Java programming language keywords?

Question: Which will legally declare, construct, and initialize an array?

Question: What will be the output of the following java program?

class Adds{

public static void main(String args[]){

int x = 20;
int y = 10;
int z = x + y;

System.out.println(" The addition of " + x + " and " + y + " is " + z);

}
}