Core Java Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Core Java Interview Questions

Questions Answers Views Company eMail

. What are the differences between constructor and method of a class in Java?

1 1007

How do you use final keywords and final variables in Java?

2 763

In Java, what types of classes perform inheritance?

2 819

What types of inheritance does Java support?

2 790

What is Java exception handling?

1 731

What are the differences between unchecked exception, checked exception, and errors?

2 984

What are the types of loops in Java, and how are they used?

2 751

How do you declare an infinite loop?

2 863

What is the difference between the continue and break statement?

2 796

What is the entry point in Java, and how is it written?

2 825

In Java, what are public static void main string args?

2 830

In Java, what’s the purpose of static methods and static variables?

2 811

How do you use, call, and access a static method in Java?

2 852

How do you use, call, and access a non-static method in Java?

2 784

In Java, what are this() and super(), and where are you required to use them?

2 773

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Un-Answered Questions { Core Java }

Can we create more than one object singleton class?

1032

What do you mean by jjs in java8?

988

How do you implement tree mirroring in java?

1071

Explain the selection sort algorithm?

1053

How to convert string to byte array and vice versa?

1086

What is the primary benefit of encapsulation?

1082

Should database connections be singleton?

956

What are the escape sequences in java?

1021

How do you use compareto method?

1014

What does file separator do in java?

1014

What does the three dot emoji mean?

1116

What is difference between protected and private?

1067

What is the difference between array list and vector in java?

935

What is JDBC Driver interface?How can you retrieve data from the ResultSet

2103

What does super keyword do?

1071

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