Java Chapter 3 Questions and Answers Already Passed

Java Chapter 3 Questions and Answers
Already Passed
What will be the output of the following code?

```java

System.out.println("Java" + 3 + 2);

```

A. Java5


✔✔B. Java32


C. Java6

D. Compilation error




What is the purpose of a constructor in Java?

A. To destroy an object

B. To execute a method automatically


✔✔C. To initialize an object


D. To create a variable




Which keyword is used to create an object of a class?

1

,A. class


✔✔B. new


C. object

D. instance




What is the return type of a constructor?

A. void

B. Object

C. int


✔✔D. It has no return type




Which of the following is true about instance variables?


✔✔A. They belong to an object of a class


B. They must be static

C. They can only be final

D. They are always private




How can you call a method of another class?


2

,A. Using `this.methodName();`

B. Using `methodName();`


✔✔C. By creating an object of the class and calling `object.methodName();`


D. Methods of another class cannot be called




What does the `this` keyword represent in Java?

A. The superclass of an object


✔✔B. The current instance of a class


C. The class itself

D. A static reference




What will be the output of the following code?

```java

System.out.println(10 + 20 + "Hello");

```

A. Hello30


✔✔B. 30Hello


C. 1020Hello


3

, D. Compilation error




Which of the following is the correct way to define a method in Java?


✔✔A. `public void display() { }`


B. `method display() { }`

C. `void method display() { }`

D. `display() { }`




How do you access a static method in Java?

A. By creating an object of the class

B. By using `this.methodName();`


✔✔C. By using `ClassName.methodName();`


D. A static method cannot be accessed




What happens if a constructor is defined as private?

A. The object can only be created using `new`

B. It cannot be inherited


✔✔C. The object cannot be created from outside the class


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