How can we make a class abstract? ?->(Show Answer!)

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1. How can we make a class abstract?

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QA->Average height of 10 students in a class is 150 cm. A boy of height 160 cm left the class and a boy of height 148 cm is admitted. Then what is the average height of the students in the class now?....

QA->There are 50 students in a class. In a class test 22 students get 25 marks each, 18 students get 30 marks each. Each of the remaining gets 16 marks. The average mark of the whole class is :....

QA->In a class of 30 children 40% are girls. How many more girls coming to this class would make them 50%?....

QA->P can do a work in the same time in which Q and R together can do it. If P and Q work together, the work can be completed in 10 days. R alone needs 50 days to complete the same work. then Q alone can do it in....

QA->he average weight of 16 boys in a class is 25 kg and that of the remaining 8 boys is 15 kg. Find the average weights of all the boys in the class.....

MCQ->interface Base { boolean m1 (); byte m2(short s); } which two code fragments will compile? interface Base2 implements Base {} abstract class Class2 extends Base { public boolean m1(){ return true; }} abstract class Class2 implements Base {} abstract class Class2 implements Base { public boolean m1(){ return (7 > 4); }} abstract class Class2 implements Base { protected boolean m1(){ return (5 > 7) }}....

MCQ->Which two of the following are legal declarations for nonnested classes and interfaces? final abstract class Test {} public static interface Test {} final public class Test {} protected abstract class Test {} protected interface Test {} abstract public class Test {}....

MCQ->Which of the following are necessary for Run-time Polymorphism? The overridden base method must be virtual, abstract or override. Both the override method and the virtual method must have the same access level modifier. An override declaration can change the accessibility of the virtual method. An abstract inherited property cannot be overridden in a derived class. An abstract method is implicitly a virtual method.....

MCQ->What will be the output of the program? public abstract class AbstractTest { public int getNum() { return 45; } public abstract class Bar { public int getNum() { return 38; } } public static void main (String [] args) { AbstractTest t = new AbstractTest() { public int getNum() { return 22; } }; AbstractTest.Bar f = t.new Bar() { public int getNum() { return 57; } }; System.out.println(f.getNum() + " " + t.getNum()); } }....

MCQ->Which of the following statements are correct? Instance members of a class can be accessed only through an object of that class. A class can contain only instance data and instance member function. All objects created from a class will occupy equal number of bytes in memory. A class can contain Friend functions. A class is a blueprint or a template according to which objects are created.....

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