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Core Java - Interview Questions and Answers for 'Object reference' - 4 question(s) found - Order By Newest

 Q1. What are the common uses of "this" keyword in java ?Core Java
Anonymous
Ans. "this" keyword is a reference to the current object and can be used for following -

1. Passing itself to another method.

2. Referring to the instance variable when local variable has the same name.

3. Calling another constructor in constructor chaining.

  Sample Code for this keyword

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   Like      Discuss      Correct / Improve     java   this   object reference   constructor chaining      intermediate        rare

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 Q2. What will this code print ?

String a = new String ("TEST");
String b = new String ("TEST");
if(a == b) {
System.out.println ("TRUE");
} else {
System.out.println ("FALSE");
}
Core Java
Anonymous
Ans. FALSE. == operator compares object references, a and b are references to two different objects, hence the FALSE. .equals method is used to compare string object content.

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   Like      Discuss      Correct / Improve     string   string class   java   ==   object references   coding     Capgemini  HCL Technologies      basic        frequent

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 Q3. There are two objects a and b with same hashcode. I am inserting these two objects inside a hashmap.

hMap.put(a,a);
hMap.put(b,b);

where a.hashCode()==b.hashCode()

Now tell me how many objects will be there inside the hashmap?
Core Java
Anonymous
Ans. There can be two different elements with the same hashcode. When two elements have the same hashcode then Java uses the equals to further differentation. So there can be one or two objects depending on the content of the objects.

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   Like      Discuss      Correct / Improve     java   hashcode   map   hashmap   object reference   advanced     Synechron


 Q4. What is the default value of a declared object reference ?Core Java2017-01-12 11:05:03

Ans. Null

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   Like      Discuss      Correct / Improve     object reference  null     HCL Technologies      basic




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