1. [10 points] True or False. For each of the following write “true” or “false”
ID: 3728651 • Letter: 1
Question
1. [10 points] True or False. For each of the following write “true” or “false” on the right.
1
Variable declaration means the same as variable initialization.
2
String is not a primitive data type.
3
Instantiation refers to implementing a method in a class.
4
In Java, every method has a return type.
5
The scope of a variable refers to the size of a variable.
6
The default constructor does not have any parameters.
7
The method signature contains the name of the method and the type of the parameters.
8
A void method has to return an integer number.
9
Any number can be represented as a String variable.
10
If x is true and y is false, what is the value of (x && !y)
2. [10 points] For each of the following statements, circle the correct answer.
1
According to name conventions, the name of a variable should be
MyVar
my_var
myVar
MY_VAR
2
According to name conventions, the name of a constant should be
MyConst
my_const
myConst
MY_CONST
3
According to name conventions, the name of a method should be
MyMethod
my_method
myMethod
MY_METHOD
4
Consider the code
String s1=””;
What is the value returned by
s1.length()
0
empty
“ ”
null
5
Consider the code
String s2=”Hello”;
What is the value returned by
s2.substring(2);
Hello
ello
llo
lo
1
Variable declaration means the same as variable initialization.
2
String is not a primitive data type.
3
Instantiation refers to implementing a method in a class.
4
In Java, every method has a return type.
5
The scope of a variable refers to the size of a variable.
6
The default constructor does not have any parameters.
7
The method signature contains the name of the method and the type of the parameters.
8
A void method has to return an integer number.
9
Any number can be represented as a String variable.
10
If x is true and y is false, what is the value of (x && !y)
Explanation / Answer
1)Variable declaration means the same as variable initialization.
Ans)False
2)String is not a primitive data type.
Ans)True
3)Instantiation refers to implementing a method in a class.
Ans)False
4)In Java, every method has a return type.
Ans)False
5)The scope of a variable refers to the size of a variable.
Ans)False
6)The default constructor does not have any parameters.
Ans)True
7)The method signature contains the name of the method and the type of the parameters.
Ans)True
8)A void method has to return an integer number.
Ans)False
9)Any number can be represented as a String variable.
Ans)false
10)If x is true and y is false, what is the value of (x && !y)
Ans)True
__________________
1) myVar
2) MY_CONST
3) myMethod
4) 0
5) llo
____________________Thank You
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