Core java - Interview Questions and Answers for 'Computer solutions' | Search Interview Question

Core java - Interview Questions and Answers for 'Computer solutions' - 3 question(s) found - Order By Newest

Frequently asked to fresh graduates and less experienced.

Q1. Why do we write public static void main ? Can we use some other syntax too for main ?

Ans. 1. public is the access modifier that makes the method accessible from anywhere, static is the keyword that makes it accessible even without creating any object, void means it doesn't return anything , String args[] is the array of argument that the method receives.

2. If we use main without the string args , it will compile correctly as Java will treat it as just another method. It wont be the method "main" which Java looks for when it looks to execute the class and hence will throw

Error: Main method not found in class , please define the main method as:
public static void main(String[] args)

3. Main is not a keyword but a special string that Java looks for while initiating the main thread.

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Related Questions

Can we have multiple main methods in a single class ?

Which of the following is false about main method ?

a. It should be declared public and static
b. it should have only 1 argument of type String array
c. We can override main method
d. We can overload main method

Can we overload main method in Java ?

What will happen if static modifier is removed from the signature of the main method?

How can we execute a Java class independently if it doesn't have a static main method ?

Can we declare a main method as abstract ?

Do all java classes need a main method?

Can we declare the main method as private ?

Why main method is declared static ?

Q2. Why java doesn't support multiple Inheritance ?

or

Explain Java Diamond Problem.

Core Java

Ans. class A {
void test() {
System.out.println("test() method");
}
}

class B {
void test() {
System.out.println("test() method");
}
}

Suppose if Java allows multiple inheritance like this,

class C extends A, B {
}

A and B test() methods are inheriting to C class.

So which test() method C class will take? As A & B class test() methods are different , So here we would Facing Ambiguity.

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Q3. Write a Program to check if 2 strings are Anagrams ?

Core Java

Ans. public void checkIfAnagram(String str1,String str2){
boolean anagram = true;
for(char c:str1.toCharArray()){
if(!str2.contains(String.valueOf(c))){
System.out.println("Strings are Anagrams");
anagram = false;
}

if(anagram == true){
System.out.println("Strings are not Anagrams");
}
}
}

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Related Questions

Difference between == and .equals() ?

Why is String immutable in Java ?

Explain the scenerios to choose between String , StringBuilder and StringBuffer ?

or

What is the difference between String , StringBuilder and StringBuffer ?

What are the difference between composition and inheritance in Java?

Does garbage collection guarantee that a program will not run out of memory?

Why Char array is preferred over String for storing password?

What are different ways to create String Object? Explain.

What is a Lambda Expression ? What's its use ?

Why do we need Inner classes ? Cant we just work with outer classes wherever we implement Inner classes ?

What is the difference between declaration, instantiation and initialization ?

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