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 1111

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

2 859

In Java, what types of classes perform inheritance?

2 923

What types of inheritance does Java support?

2 907

What is Java exception handling?

1 814

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

2 1096

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

2 861

How do you declare an infinite loop?

2 982

What is the difference between the continue and break statement?

2 911

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

2 940

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

2 928

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

2 880

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

2 949

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

2 877

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

2 856

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Un-Answered Questions { Core Java }

Is string pool garbage collected?

1065

what is difference between equals and ==?

1115

Write a function to print Fibonacci series and Tribonacci series?

1214

What is java util concurrentmodificationexception?

954

Make a data structure and implement an algorithm to print all the files in a directory. (The root directory can have sub-directories too.)

1378

What does flagged out mean?

1116

How do you check if a character in a string is a digit or letter?

1123

How many bytes is double?

1045

What is the default value of the local variables?

1077

What about main() method in java ?

1050

What is pojo class in java?

1195

What is dynamic array in java?

1073

Is java a prime method?

1036

How do you declare an array in java?

1129

For ease of programming you can consider the maze as a 2D array with colors represented by below integer and characters (in capital letters). • B - Black • W -White • G- Green • R- Red R B W B W W W W W W B W B B W W W W W W W B W B W W W B W W W W B B W W W B W W W B W W B B B B W B W B W W B W W W B W W W B B B W W B W W W B W W B W B W W W B W B W W W W B B W W W W B W W W W W G Shortest Route Problem: • Solution that finds the shortest Route between Red and Green  White will have 1 Weight.  Red and Green carry no weights.  Shortest path is the path with less weight when you add up the weights in the path.

2055

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