Interview Question and Answers | Search Coding Interview Questions

Interview Questions and Answers - Order By Newest

Q3421. Will this code give any error ?

let result: boolean;
result = false || true;

Typescript

Ans. No

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Q3422. Will this code give any error ?

let result: boolean | string;
result = false || 'true';

Typescript

Ans. No

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Q3423. Will this code give any error ?

let result: string;
result = false || 'true';

Typescript

Ans. No

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Q3424. Can we get the validators for a control in angular ? How ?

Angular

Ans. No - https://github.com/angular/angular/issues/13461

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Q3425. How can we add a text in front of all input fields in an application ?

Angular

Ans. We can create a directive with selector as 'input' and then onInit of the directive , we can append the text to the input control html.

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Q3426. Can we have multiple selectors for a directive in Angular ?

Angular

Ans. Yes

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Q3427. What is the use of NgControl ?

Angular

^{This question is still unanswered. Can you please provide an answer.}

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Q3428. What is the use of Renderer class in angular ?

Angular

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Q3429. What is the use of ElementRef in angular ?

Angular

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Q3430. How can we add a particular styling to a field based on a condition ?

Angular

Ans. We can create a directive to do that.

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Q3431. Can we have a directive that get's applied based on an attribute on a field ?

Angular

Ans. Yes

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Q3432. Can we initialize final fields within the constructor ? Why ?

Core Java

Ans. Yes, Because final fields needs to be initialized before the construction of the object completes. Not necessarily at the time of class loading.

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Q3433. What is systemd in Unix ?

Unix

^{This question was recently asked at 'Broadcom, Symantec'.This question is still unanswered. Can you please provide an answer.}

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Q3434. What is Array.Map function ? What will be output of following ?

const myArray = [1, 4, 9, 16];
const result = myArray.map(x => x * 2);

Javascript

Ans. It will create an array with each value as x*2

[2, 8, 18, 32]

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Q3435. What would you use the span element for ?

HTML

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Q3436. When String literals are compared using ==, they always returns true if the string values are same because .. Reference

Core Java

a. of overridden compareTo method

b. of overridden compare method

c. of String Pool

d. == means that the object contents are equal

Ans.c. of String Pool

Q3437. Which of the following is true ?

Core Java

a. Composition is Tightly Bound

b. Inheritance is Tightly Bound

c. Object can only hold reference of only one other object

d. A Class cannot be extended by multiple classes

Ans.b. Inheritance is Tightly Bound

Q3438. In case of String Literals .. Reference

Core Java

a. x==y on all literals always returns false

b. x.equals(y) on all literals always returns false

c. if x.equals(y) returns true, x==y returns true too

d. if x.equals(y) returns false, x==y returns true

Ans.c. if x.equals(y) returns true, x==y returns true too

Q3439. What is a default constructor ? Reference

Core Java

a. Constructor without parameters declared by user

b. Constructor provided by Java if no constructor is declared

c. Constructor with empty body

d. All of the above

Ans.b. Constructor provided by Java if no constructor is declared

Q3440. How can we create objects if we make the constructor private ?

Core Java

a. We can't create objects if constructor is private

b. We can only create objects if we follow singleton pattern

c. We can only create one object

d. We can create new object through static method or static block

Ans.d. We can create new object through static method or static block

Q3441. What will be the output of following ?

String str1 = new String("String1");
String str2 = new String("String1");
System.out.print(str1 == str2);
System.out.print(str1.equals(str2));
str1 = str2;
System.out.print(str1 == str2);

Core Java

a. falsetruetrue

b. truetruetrue

c. truetruefalse

d. falsetruefalse

Ans.a. falsetruetrue

Q3442. What will be the output of following code ?

String str1 = "String1";
String str2 = "String1";
System.out.print(str1 == str2);
System.out.print(str1.equals(str2));
str1 = str2;
System.out.print(str1 == str2);

Core Java

a. falsetruetrue

b. falsefalsetrue

c. truetruetrue

d. falsefalsefalse

Ans.c. truetruetrue

Q3443. What will be the output of following code ?

String str1 = "String1";
String str2 = "String2";
str1.concat("String3");
System.out.print(str1);
System.out.print(str2);

Core Java

a. String1String2

b. String1String3String3

c. String1String3String1String3

d. String1String1

Ans.a. String1String2

Q3444. What will be the output of following code ?

String str1 = "String1";
String str2 = "String2";
str1=str1.concat("String3");
System.out.print(str1);
System.out.print(str2);

Core Java

a. String1String2

b. String1String3String2

c. String1String2String3

d. String1Stringg3String1

Ans.b. String1String3String2

Q3445. Which method needs to be implemented if a class is implementing comparable interface ?

Core Java

a. comp

b. compare

c. compareTo

d. compareEquals