What is the difference between path and classpath?

Correct Answer: JAR files are java's version of ZIP files In fact, JAR uses the ZIP file format uses: - to compress a number of class files into one file - to make a java executable JAR file

Correct Answer: Unwrapping is also called as unpacking or unboxing Getting the private data stored in the object by using methods is called unpacking or unwrapping

Correct Answer: Wrapping is also called as packing or boxing Storing the data inside the object as private data which can accessed outside the class only by using methods

Correct Answer: String class objects are immutable objects and they represents strings( sequence of characters) StringBuffer class objects are mutable objects representing strings and they are Thread safe StringBuild class objects are also mutable objects representing strings and they are not Thread safe

Correct Answer: new ClassName( arg1, arg2, argN); Ex: Class sample { Sample(int a) { Systemoutprintln("arg con a =" +a); } } class Demo { Public static void main( String[] args) { Sample s1= new Sample(23); Sample s2= new Sample(45); } }

Correct Answer: By using super call we can call super class constructors from sub class constructors and we can initialize super class private data

Correct Answer: yes if the method is ovreriding method no if the method is not overriding method

Correct Answer: - By using method overriding a sub class can change the definition of super class method - By using overriding a sub class can modify the functionality of the super class

Correct Answer: By using overloading we can add new functionality to the sub class

Correct Answer: Final method is a method defined in the super class with final modifier We cannot overriding final method of super class in the sub class EX: Class Sample { final void funOne() { } void funTwo() { } } Class Sub extends Sample { void funOne() { // overriding is not allowed } viod funTwo() { //overriding is allowed } }