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

Core Java Interview Questions

Questions Answers Views Company eMail

Is it possible to create Userdefined Unchecked Exception also?If Yes, give an example?

ADP,

2 8961

What is JIT ?

Satyam,

4 10210

can we add two numbers without using arthematic operators? if possible how?

CTS,

5 9920

why the equals method can be override?when we override the equals method?

5 11274

why the wait,notify,notifyall methods are placed in object class?these are the thread concepts why these methods are placed in Object class?

Global Logic, Satyam,

2 11681

using equals method overriding which objects are compared?i.e same class objects or other class objects?Explain me.

4 6558

If set accepts only one argument then how can it compare two objects to avoid duplicates

5 7327

can u override the start() method of Thread class

5 20357

which method throws exception of type Throwable

2 5646

can u handle an error if u write Thowable in the catch class lise try { some errorneous code }catch(Throwable e){ ...}

4 8350

how to convert mm/dd/yy to dd/mm/yy using collections in java.

Bosch,

4 12645

how do you store phone numbers using java collections

Bosch, IBAB,

5 19099

which one is performance wise advantageious from List,Set,Map?

6 12427

string is immutable? right every one knows that, my question is it advantage or disadvantage making string immutable?

HCL,

5 11094

What is difference between hash mapping and hash table?

NDS, Wipro,

5 10847

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Un-Answered Questions { Core Java }

How many decimal digits is 64 bit?

997

Is empty set an element of empty set?

1174

What is the multi-catch block in java?

1108

Can we use string in switch case in java?

1139

Can we inherit a class with private constructor?

1182

Can finally block be used without a catch?

1064

Explain the usage of this with constructors?

1075

Why do we need autoboxing in java?

1069

What is an accessor?

1773

What are actual parameters?

1095

Explain which of the following methods releases the lock when yield(), join(),sleep(),wait(),notify(), notifyall() methods are executed?

1169

What is methodological theory?

1044

How do you replace a string in java?

1055

Explain jvm, jre, and jdk?

1060

Is class is a data type?

1138

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