Data structures and Algorithms with Java -chapter 2 Exam Questions with Verified Solutions (Graded A+)

Data structures and Algorithms with Java -chapter 2 Exam Questions with Verified Solutions (Graded A+) All types that are not one of the eight primitive types are ___________________, including important entity types such as strings, arrays, and, streams. - Answers reference type A _______________ variable in java is a variable that somehow stores the memory address where an object resides. - Answers reference In Java, the only operators that are allowed for reference types (with one exception made for _____________) are assignment via = and equality comparison via == or != - Answers Strings The dot operator is used to select a _________________ that is applied to an object - Answers method, For instance, suppose we have an object of type Circle that defines an area method. If theCircle references a Circle, then we can compute the area of the referenced Circle (and save it to a variable of type double) by doing this: double theArea = theC( ); new is used to construct a new __________________ - Answers object What is garbage collection? - Answers In Java, when a constructed object is no longer referenced by any object variable, the memory it consumes will automatically be reclaimed and therefore be made available. There is no less than operator available for any _________________. Instead a named method, such as lessThan, must be created - Answers Object How do operators work with string objects? - Answers In accordance with the ban on operator overloading, relational operators (<, >, <=, and >=) are not defined for the String type. Further, == and != have the typical meaning for reference variables. For two String objects lhs and rhs, for example, lhs==rhs is true only if lhs and rhs refer to the same String object. Thus, if they refer to different objects that have identical contents, lhs==rhs is false. Similar logic applies for != To compare two String objects for equality, we use the ____________ method. - Answers equals, s(rhs) is true if lhs and rhs reference Strings that store identical values. A more Use equals and ______________________ to perform string comparison. - Answers compareTo Use length,___________, and substring to compute string length, get a single character, and get a substring, respectively. - Answers charAt What data type and value is returned after the following operation? "" + 45.3 - Answers A string with the following value is returned : "45.3". The operation shown in this example is a way we can convert values to strings. The method _______________ can be used to convert any primitive type to a string. - Answers toString What are exceptions? - Answers Exceptions are