please i need help with this: I JUST NEED reason. the answer is given. 1. Analyz
ID: 3566741 • Letter: P
Question
please i need help with this:
I JUST NEED reason. the answer is given.
1. Analyze the following code(Multiple answers) (explain/ show your work):
answer=A & C
class Test {
private double i;
public Test(double i) {
this.t();
this.i = i;
}
public Test() {
System.out.println("Default constructor");
this(1);
}
public void t() {
System.out.println("Invoking t");
}
}
2. What is the printout for the third println statement (in red ink) in the main method? ( explain/show your work)
ANSWER =A
public class Foo {
static int i = 0;
static int j = 0;
public static void main(String[] args) {
int i = 2;
int k = 3;
{
int j = 3;
System.out.println("i + j is " + i + j);
}
k = i + j;
System.out.println("k is " + k);
System.out.println("j is " + j);
}
}
B. j is 1
C. j is 2
D. j is 3
3. Which of the following statements are true about an immutable object?
ANSWER =A& B
A. The contents of an immutable object cannot be modified.
B. All properties of an immutable object must be private.
C. All properties of an immutable object must be of primitive types.
D. An object type property in an immutable object must also be immutable.
E. An immutable object contains no mutator methods.
4. Which of the following can be placed in the blank line in the following code? Please explain.
ANSWER= A
public class Test {
private static int id;
public static void m1() {
_____.id = 45;
}
}
A. this
B. Test
Explanation / Answer
Answer 1:Third option is correct because,In Test() method this(1) should be the first statement in the method because the constructor should be called as the first statement.
Answer 2:First option is correct because,j is mentioned as static variable so it got initialised to j=0 and will print j as 0.
Answer 3:A option is correct because,immutable objects are objects whose state cannot be changed.
Answer 4:B option is correct because,the class variables can be called with the class name itself and this should not be used in static content.
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