What is the differnce among public, protected and package access data?

Correct Answer: Whenever there is local- variable/parameter inside the method with same name as data member Ex: Class Sample { int a; void show() { int a=5; systemoutprintln(a); // 5 systemoutprintln(thisa);//23 } } class MainApp { Public static void main(String[] args) { Sample s = new Sample(); sa = 23; sshow(); } }

Correct Answer: This is a keyword and used as reference to Current object address in java It means by using which object the method is called that object hashcode is stored inside the 'this'

Correct Answer: bcoz the static method does not contains the 'this' reference

Correct Answer: ClassName refName = new ClassName(); or ClassName refName; refName = new ClassName();

Correct Answer: new ClassName(); This expression creates object in heap area and returns that obj address Here JVM creates object but JVM does not returns object original address JVM returns duplicate address, duplicate address is also called as hashcode

Correct Answer: By using method The method used to set the data is called setter method

Correct Answer: By using method The method used to get the data is called getter method

Correct Answer: Method contains name, parameters, return type and executable body But block does not contains name, parameters, return typeIt contains only executable body Methods are executed by method call statements Blocks are executed automatically with class loading and with object creation

Correct Answer: Constructor is not a special method Constructor is block of code that is executed automatically whenever object of the class is created

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); } }