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Java - Test Questions on 'Operator' - 10 questions found


Which of the following is true for == operator ?Core Java
For primitives, == checks if the variables on left and right have same data type
For primitives, == checks if the variables on left and right have same value
For Objects, == checks if the references on left and right have same data type
For Objects, == checks if the references on left and right have same value

  == operator  equality

Which of the following is equivalent to following logic ?

Not X && Not Y
Core Java
x || Y
Not(X || Y)
Not(X && Y)
Not X && Y

  logical operator

Which of the following statement is not true ?Core Java
x==y means they are pointing to the same object
x==y means that they hold same information
x.equals(y) means they are pointing to the same object
x.equals(y) means that they hold same information

  

When String literals are compared using ==, they always returns true if the string values are same because .. Core Java
of overridden compareTo method
of overridden compare method
of String Pool
== means that the object contents are equal

  

What will be the output of following ?

String str1 = new String("String1");
String str2 = new String("String1");
System.out.print(str1 == str2);
System.out.print(str1.equals(str2));
str1 = str2;
System.out.print(str1 == str2);
Core Java
falsetruetrue
truetruetrue
truetruefalse
falsetruefalse

  equals  object equality

What will be the output of following code ?

String str1 = "String1";
String str2 = "String1";
System.out.print(str1 == str2);
System.out.print(str1.equals(str2));
str1 = str2;
System.out.print(str1 == str2);
Core Java
falsetruetrue
falsefalsetrue
truetruetrue
falsefalsefalse

  equals  object equality  string pool

What will be the output of following code ?

String str1 = "String1";
String str2 = "String2";
str1.concat("String3");
System.out.print(str1);
System.out.print(str2);
Core Java
String1String2
String1String3String3
String1String3String1String3
String1String1

  

What will be the output of following code ?

String str1 = "String1";
String str2 = "String2";
str1=str1.concat("String3");
System.out.print(str1);
System.out.print(str2);
Core Java
String1String2
String1String3String2
String1String2String3
String1Stringg3String1

  

Which of the following can throw ClassCastException ?Core Java
UpCasting
DownCasting
Casting to incompatible data type
Casting to Strings

  casting

x instanceOf y returns false ..Core Java
if x is an instance of y class
if x is an instance of class implementing y interface
if x is an instance of class extending y class
if x is an instance of Class which is a parent of Y class

  instaceOf







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