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Core Java - Interview Questions and Answers for '=' - 12 question(s) found - Order By Newest | |||||||||||
Very frequently asked. Among first few questions in almost all interviews. Among Top 5 frequently asked questions. Frequently asked in Indian service companies (HCL,TCS,Infosys,Capgemini etc based on multiple feedback ) and Epam Systems | |||||||||||
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Ans. "equals" is the method of object class which is supposed to be overridden to check object equality, whereas "==" operator evaluate to see if the object handlers on the left and right are pointing to the same object in memory. x.equals(y) means the references x and y are holding objects that are equal. x==y means that the references x and y have same object. Sample code: String x = new String("str"); String y = new String("str"); System.out.println(x == y); // prints false System.out.println(x.equals(y)); // prints true | |||||||||||
Sample Code for equals | |||||||||||
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Like Discuss Correct / Improve  java   string comparison   string   object class   ==   equals   object equality  operator   == vs equals   equals vs == Asked in 294 Companies basic   frequent | |||||||||||
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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 Asked in 2 Companies basic   frequent | |||||||||||
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Ans. true, due to String Pool, both will point to a same String object. | |||||||||||
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Like Discuss Correct / Improve  java   code   coding   tricky questions   interesting questions   string   string pool   .equal   == intermediate   frequent | |||||||||||
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Ans. The = operator is right associative. | |||||||||||
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Like Discuss Correct / Improve  java   operators   = operator | |||||||||||
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Ans. x==y means that both references have same type and are pointing to same memory location and hence would always mean that they have same value. x.equals(y) is not required in this case. | |||||||||||
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Like Discuss Correct / Improve  if statement  control statements  == and equals  ==  .equals   code optimization | |||||||||||
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Ans. if x==y turns out to be true x.equals(y) will be true too. If x.equals(y) could be true even if x==y is true or not. So the only possible outcomes are 1 || 1 = 1 0 || 1 = 1 0 || 0 = 0 i.e the outcome of x.equals(y) check for x==y is not required in this if statement. | |||||||||||
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Like Discuss Correct / Improve  if statement  control statements  == and equals  ==  .equals   code optimization | |||||||||||
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Ans. = is the assignment operator that assigns the result of the expression on the right to the variable on the left, whereas == is the operator to check object equality to see if the reference on left and right are pointing to the same object. For primitive types, its used to check if both variables holds the same value. | |||||||||||
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Like Discuss Correct / Improve  =  ==  assignment operator  object equality  difference between Basic | |||||||||||
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Ans. For objects or references, == operator check if the reference on left and right points to the same object. For primitive types or variables, == operator check if the variable on left and right holds the same value. | |||||||||||
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Like Discuss Correct / Improve  ==  object equality  operator Basic | |||||||||||
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Ans. It will print "true" with integers as well as strings. The reason is "Integer constant pool" and "String pool" String pool maintains pool of string literals. When a string literal is used for the first time, a new string object is created and is added to the pool. Upon it's subsequent usage , the reference for the same object is returned. Similarly java uses integer constant pool. | |||||||||||
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Like Discuss Correct / Improve  string pool  object equality  == | |||||||||||
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Ans. >= => will result in error. => somewhat looks like lambda operator "->" | |||||||||||
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Like Discuss Correct / Improve  operators  >= operator  greater than and equal to operator  comparison operators | |||||||||||
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Ans. false false | |||||||||||
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Like Discuss Correct / Improve  object equality  ==  coding  code Asked in 1 Companies | |||||||||||
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Ans. == compares values === is used in scripting languages for comparing two values as well as there data tpe. like in js,php. | |||||||||||
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Like Discuss Correct / Improve  ==  ===  == vs === Asked in 13 Companies basic   frequent | |||||||||||
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