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Object Oriented Programming

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What is the output?

public class Demo implements Runnable
{
    public static void main(String args[])
    {
        Runnable t = new Demo();
        t.start();        
    }
    public void run()
    {
        System.out.println("Task");
    }
}

/**/

document.oncopy = new Function("return false");

document.onpaste = new Function("return false");

document.onselectstart = new Function("return false");

document.oncontextmenu = new Function("return false"); /**/

The program does not compile because the start() method is not defined in the class Demo.

100%

The program compiles, but it does not run because the start() method is not defined.

The program compiles and runs fine.

The program compiles, but it does not run because the run() method is not implemented.

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What is the output?

public class Demo{    
  public static void main(String args[]){    
   try{    
    int a[]=new int[5];    
    a[5]=30/0;    
   }    
   catch(Exception e){System.out.println("C1");}    
   catch(ArithmeticException e){System.out.println("C2");}    
   catch(ArrayIndexOutOfBoundsException e){System.out.println("C3");}    
   System.out.println("Output");    
 }    
}

/**/

document.oncopy = new Function("return false");

document.onpaste = new Function("return false");

document.onselectstart = new Function("return false");

document.oncontextmenu = new Function("return false"); /**/

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What is the output?

public class Demo{  
  void m(){  
    int x = 50/0;
    System.out.println("1");
  }  
  void n(){  
    m();
    System.out.println("2");
  }  
  void p(){  
   try{  
    n();  
   }catch(Exception e){System.out.println("3");}  
  }  
  public static void main(String args[]){  
   Demo obj=new Demo();  
   obj.p();  
   System.out.println("4");  
  }  
}

/**/

document.oncopy = new Function("return false");

document.onpaste = new Function("return false");

document.onselectstart = new Function("return false");

document.oncontextmenu = new Function("return false"); /**/

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What happens if run() is called directly instead of start() in Java threads?

/**/

document.oncopy = new Function("return false");

document.onpaste = new Function("return false");

document.onselectstart = new Function("return false");

document.oncontextmenu = new Function("return false"); /**/

It stops the thread immediately

It suspends the thread

It starts a new thread and executes the run() method

The run() method is executed in the current thread, not as a separate thread

100%

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What is the output?

public class Outer {
    public static void method() {
        interface IF {
            void greet();
            System.out.println("Hi");
        }
        class Inner implements IF {
            public void greet() {
                System.out.println("Hello");
            }
        }
        Inner in = new Inner();
        in.greet();
    }
    public static void main(String[] args) {
	method();
	System.out.println("Bye");
    }
}

/**/

document.oncopy = new Function("return false");

document.onpaste = new Function("return false");

document.onselectstart = new Function("return false");

document.oncontextmenu = new Function("return false"); /**/

Hello
Bye

Bye

Hi
Bye

100%

Error

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What is the output?

public class Outer {
    public void method() {
        class Inner {
            static final String a = "Hello";
            public void greet() {
                System.out.println(a);
            }
        }
        new Inner().greet();
    }
    public static void main(String[] args) {
	new Outer().method();
	System.out.println("Bye");
    }
}

/**/

document.oncopy = new Function("return false");

document.onpaste = new Function("return false");

document.onselectstart = new Function("return false");

document.oncontextmenu = new Function("return false"); /**/

Error

Bye

Hello

Hello
Bye

100%

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What does the T in class Demo<T> {} represent?

document.oncopy = new Function("return false");

document.onpaste = new Function("return false");

document.onselectstart = new Function("return false");

document.oncontextmenu = new Function("return false");

// Disable copy, paste, text selection, and right-click context menu

document.oncopy = new Function("return false");

document.onpaste = new Function("return false");

document.onselectstart = new Function("return false");

document.oncontextmenu = new Function("return false");

// Prevent new tab and new window shortcuts

window.addEventListener("keydown", function(event) {

if ((event.ctrlKey && event.key === 't') || (event.ctrlKey && event.key === 'n')) {

event.preventDefault();

alert("Opening a new tab or window is not allowed during the quiz.");

// Close the current tab or new window immediately

window.close();

}

});

// Detect and close the tab if the user tries to switch away from it

document.addEventListener("visibilitychange", function() {

if (document.visibilityState === "hidden") {

alert("Please stay on this tab to complete the quiz.");

// Reload the page if user tries to leave the tab

location.reload();

}

});

// Block certain key combinations for opening developer tools

window.addEventListener("keydown", function(event) {

if ((event.ctrlKey && event.shiftKey && event.key === 'i') || // Ctrl+Shift+I

(event.ctrlKey && event.shiftKey && event.key === 'j') || // Ctrl+Shift+J

(event.ctrlKey && event.shiftKey && event.key === 'c') || // Ctrl+Shift+C

(event.ctrlKey && event.key === 'u')) { // Ctrl+U

event.preventDefault();

alert("Developer tools are disabled during the quiz.");

}

});

document.oncopy = new Function("return false");

document.onpaste = new Function("return false");

document.onselectstart = new Function("return false");

document.oncontextmenu = new Function("return false");

A fixed class name

A primitive data type

A template function

A type parameter

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What are generic methods?

/**/

document.oncopy = new Function("return false");

document.onpaste = new Function("return false");

document.onselectstart = new Function("return false");

document.oncontextmenu = new Function("return false"); /**/

Generic methods are methods that introduce their own type parameters

100%

Generic methods are the methods that extend generic class methods

Generic methods are the methods defined in a generic class

Generic methods are methods that take void parameters

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Identify the statement(s) related with 'throws'.

/**/

document.oncopy = new Function("return false");

document.onpaste = new Function("return false");

document.onselectstart = new Function("return false");

document.oncontextmenu = new Function("return false"); /**/

The throws keyword is followed by class names of Exceptions to be thrown

Used to declare multiple exceptions that can be thrown by the method

Can be used to propagate checked exceptions only

Used in the method signature to declare an exception which might be thrown by the function while the execution of the code

100%

Used throw an exception explicitly in the code, inside the function or the block of code

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In which line do you find an anonymous object being created?

class Student {
public class MyClass {
    public static void main(String args[]) {
	Student obj = new Student();				//Line-1
	Student obj1 = new Student(), obj2 = new Student();	//Line-2
	new Student();						//Line-3
    }
}