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| Core java - Interview Questions and Answers for 'Computer solutions' - 3 question(s) found - Order By Newest | |||||
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| 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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 Discuss Correct / Improve  java main method  Asked in 4 Companies  basic  frequent | |||||
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 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 ? | |||||
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| 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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| Discuss Correct / Improve multiple inheritance object oriented programming (oops) oops concepts diamond problem Asked in 20 Companies basic frequent | |||||
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| 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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| Discuss Correct / Improve check if 2 strings are Anagrams Asked in 30 Companies basic frequent | |||||
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| 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? | |||||
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| Why do we need Inner classes ? Cant we just work with outer classes wherever we implement Inner classes ? | |||||
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