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4 years ago

A. When executing System.out.println(a1), the toString() method in the Object class is invoked.

Computers and Technology

1 answer:

Zina [86]4 years ago

6 0

This question is incomplete, it lacks a piece of code to analyze.

I think you wanted an answer to the following question:

Analyze the following code:

public class Test {

public static void main(String[] args) {

Object a1 = new A();

Object a2 = new Object();

System.out.println(a1);

System.out.println(a2);

}

class A {

int x;

@Override

public String toString() {

return "A's x is " + x;

}

A. When executing System.out.println(a1), the toString() method in the Object class is invoked.

B. When executing System.out.println(a2), the toString() method in the Object class is invoked

C. When executing System.out.println(a1), the toString() method in the A class is invoked.

D. The program cannot be compiled, because System.out.println(a1) is wrong and it should be replaced by System.out.println(a1.toString())

E. Both B and C.

Answer:

E. Both B and C.

Explanation:

toString() method is used to get the representation of this object as a string. When trying to display a string representation of an object usually the full name of the class will be displayed.

In the example above, line

System.out.println(a2);

would display something like

[email protected]

Obtained value can hardly serve as a good string description of an object. Therefore, toString() method is often overridden using @Override annotation (more info about @Override at https://beginnersbook.com/2014/07/override-annotation-in-java/)

Line

System.out.println(a1);

would display "A's x is 0" because it uses toString() method overridden in class A.

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3 years ago

Write a class named Averager containing: An instance variable named sum of type integer, initialized to 0. An instance variable

vladimir1956 [14]

Answer:

The answer to this question can be given as:

Class definition:

public class Averager //define class Average.

{

private int sum = 0;

//define variable sum.

private int count = 0;

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public int getSum() //define function getSum().

{

return sum; //return value.

}

public void add(int x)

//define function add().

{

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}

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{

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}

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{

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}

Explanation:

The above class definition can be described as:

In the above class definition first we define a class that is " Averager". In this class we define two integer variable that is "sum and count" and assign a value that is 0. Then we define a functions :
First we define getSum() function in this function we does not pass any value and the return type of this function is int that will return an integer value.
Then we define add() function we use this function two times but both functions have different from each other.
In first time implementation, we define this function and the return type of this function is void which means it does not return any value. In this function, we calculate the sum value and increase the value of the count variable by 1.
In second time implementation, we define this function and the return type of this function is int which means it will return a value. In this function, we will return the count variable value.
At the last, we define a getAverage() that calculates the average of the added values in the sum variable and returns its value.

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