Which access modifier is used to achieve encapsulation in Java?

What will be the output of the following code? class Demo { private int x = 5; public int getX() { return x; } } class Test { public static void main(String[] args) { Demo d = new Demo(); System.out.println(d.x); } }

What is abstraction in Java?

Which one is not a benefit of encapsulation?

Which keyword is used to inherit a class in Java?

Which of these is a has-a relationship?

In Java, which of these can be inherited?

What is the result of this code? class A { int x = 10; } class B extends A { int y = 20; } class Test { public static void main(String[] args) { B b = new B(); System.out.println(b.x + b.y); } }

Which statement is true about inheritance?

What does the super keyword do in Java?

What is the output? class A { void show() { System.out.println("A"); } } class B extends A { void show() { System.out.println("B"); } } class Test { public static void main(String[] args) { A obj = new B(); obj.show(); } }

Which of the following allows Java to support runtime polymorphism?

What is the output of this code? class Parent { int fun() { return 1; } } class Child extends Parent { int fun() { return 2; } } public class Main { public static void main(String[] args) { Parent p = new Child(); System.out.println(p.fun()); } }

Which operator checks whether an object is of a particular type?

Which class is the parent of all Java classes?

In which relationship is one class a specialized version of another?

Which of these is not a valid form of inheritance in Java?

If class Manager extends Employee, what is true?

Which keyword is used to call a superclass method in Java?

What will be the output? String s1 = "Java"; String s2 = "Java"; System.out.println(s1 == s2);

How do you create a mutable string in Java?

Which of these methods returns the length of a String?

Which method is used to compare two strings for equality, ignoring case?

What will be the output? String s1 = new String("Test"); String s2 = new String("Test"); System.out.println(s1 == s2);

What will be the output? String s1 = new String("Test"); String s2 = new String("Test"); System.out.println(s1 == s2);

What is the result of "hello".toUpperCase()?

Which method adds a string at a specified position in a StringBuffer?

How do you reverse a StringBuffer?

What does String s = "abc"; s = s + "d"; result in?

What is the default capacity of a new StringBuffer object?

What will System.out.println("Java".charAt(2)); print?

Which method can remove a substring from StringBuffer?

What is the result of System.out.println("hello".compareTo("world"));?

Which method checks if a string starts with a specific prefix?

Which will result in a true output? String s1 = "Test"; String s2 = "Test"; System.out.println(s1.equals(s2));

What is returned by "abcdef".substring(2,4);?

Which of these is a mutable class?

Which is not allowed as a method override?

Which class can be used to build strings efficiently in Java?

Which access specifier allows access only within the same class?

What is the output of this code? class X { void print() { System.out.println("X"); } } class Y extends X { void print() { System.out.println("Y"); } } public class Test { public static void main(String[] args) { X obj = new Y(); obj.print(); } }

Which is true about the Object class in Java?

Which operator returns false if an object is not an instance of a given class?

What is the use of the finalize() method?

What will be the output of the following code? StringBuffer sb = new StringBuffer("Hello"); sb.append("World"); System.out.println(sb);

Which of these is not a type of association?

Which method is used to get a part of a StringBuffer as a String?

What is output? String s = " Hello "; System.out.println(s.trim());

What will be the result? String s = "abc"; System.out.println(s.endsWith("c"));

What is the result of: System.out.println("Java".replace('a','e'));