Ticker

6/recent/ticker-posts

Java Programming Practice MCQs Codetantra. CBT-5

GoHonoring May 10, 2022

 Java Programming Practice MCQs Codetantra. CBT-5

  • Lambda Expressions
  • Date Time (Utility Classes)
  • Exception Handling

01. Choose the correct option for the code given below:

class Main {
    String dummy = "5";
    void property1() {
        try {
            dummy = dummy + "11";
            property2();
        }
        catch (Exception exc) {
            dummy = dummy + "29";
        }
    }
 
    void property2() throws Exception {
        try {
            dummy = dummy + "39";
            property3();
        }
        catch(Exception e) {
            throw new Exception();
        }
        finally {
            dummy = dummy + "55";
        }
 
        dummy = dummy + "173";
 
    }
     
    void property3() throws Exception {
        throw new Exception();
    }
 
    void showTime() {
        System.out.println(dummy);
    }
 
    public static void main(String[] args) {
        Main mainObject = new Main();
        mainObject.property1();
        mainObject.showTime();
    }
 
}
 
  
  •  

    Code prints:

    511395529

  •  

    Code prints:

    5113955173

  •  

    Code prints:

    5113929

  •  

    Code prints:

    511395517329


02. Choose the correct option for the code given below:

class Main {   
    int dummy = 65;
    void compute() throws Exception {
        try {
            dummy += 3;
            try {
                dummy += 3;
                try {
                    dummy += 3;
                    throw new Exception();
                    
                }
                catch(Exception exc) {
                    dummy += 3;
                    throw new Exception();
                }
            }
            catch(Exception ex) {
                dummy += 3;
            }
        }
        catch(Exception ex) {
            dummy += 3;
        }
 
    }
 
    void showTime() {
        System.out.println(dummy);
    }
 
    public static void main(String[] args) throws Exception {
       Main object = new Main();
        object.compute();
        object.showTime();
    }
}
  •  

    80

  •  

    83

  •  

    Error-> 'try' without 'catch', 'finally' or resource declarations


  •  

    77


03. Find out the correct results of given code snippet:

import java.util.*;
class Main {
public static void main(String args[]) {
		int array1[] = { 3, 52, 10, 25, 42, 18, 35 };
		int array2[] = Arrays.copyOfRange(array1, 2, 6);
		for (int i : array2)
			System.out.print(i + " ");
    	System.out.println();
    	int[] array3 = Arrays.copyOfRange(array1, 8, array1.length + 3);
		for (int i : array3)
			System.out.print(i + " ");
	}
}

  • 10 25 42 18 

    0 0 0

  •  

    10 25 42 18 35

    35 0 0

  •  

    Code throws  IIlegalArgumentException

  •  

    Code throws ArrayIndexOutOfBoundsException


04. Predict the right option for the below given code snippet.

public class Main {
     static int x, y;
     public static void main(String args[]) {
         try{
             A();
             x = 10; y = 3;
             
         }
         catch(RuntimeException ex) {
             System.out.print("81"); 
             
         }
         catch(Exception ex) { 
             System.out.print("67"); 
             
         }
         System.out.print("54");
         
     }
     private static void A() {
         try {       
             B();    
             
         }
         finally { 
             System.out.print("8");  
         }
     }
        
      private static void B() {
          try { 
              int res = x/y;
              System.out.print(res); 
	     }
	     catch(NumberFormatException | NullPointerException ex) {
	         System.out.print("39");
	           
	     }
            
      }
    
}
  •  

    88154

  •  

    86754

  •  

    39854

  •  

    Compilation Error


05. Predict the right option for the below given code snippet.

public class Main {
     static int x, y;
     public static void main(String args[]) {
         try{
             A();
             x = 10; y = 3;
             
         }
         catch(RuntimeException ex) {
             System.out.print("92"); 
             
         }
         catch(Exception ex) { 
             System.out.print("78"); 
             
         }
         System.out.print("45");
         
     }
     private static void A() {
         try {       
             B();    
             
         }
         finally { 
             System.out.print("20");  
         }
     }
        
      private static void B() {
          try { 
              int res = x/y;
              System.out.print(res); 
	     }
	     catch(NumberFormatException | ArithmeticException ex) {
	         System.out.print("31");
	           
	     }
            
      }
    
}
  •  

    209245

  •  

    207845

  •  

    312045

  •  

    Compilation Error


06. Choose the correct option for the code given below:

class Main {
   public static void main(String args[]) {
       try {
           int a = 82;
           throw ++a;
           
       }
       catch(int status) {
           System.out.println(status);
           
       }
       
   }
}


  •  

    82

  •  

    83

  •  

    No errors but nothing is going to be printed because catch will be bypassed for integer types

  •  

    Errors: Incompatible and unexpected types


07. Choose the correct option for the code given below:

class Main {
   public static void main(String args[]) { 
      try {
         throw new Exceptions();
      }
      catch(Exceptions t) {
         System.out.println("34");
      }
      finally {
         System.out.println("199");
      }
  }
}
class Exceptions extends Exception { 
    
}
  
  •  

    34

    199

  •  

    199

  •  

    34

  •  

    Error: Exceptions class is not found


08. Choose the correct option for the code given below:

class Main {
   public static void main(String args[]) { 
      try {
         throw new Exceptions();
      }
      catch(Exceptions t) {
         System.out.println("76");
      }
      finally {
         System.out.println("140");
      }
  }
}
class Exception extends Exceptions { 
    
}
  
  •  

    76

    140

  •  

    140

  •  

    76

  •  

    Error: Exceptions class is not found


09. Choose the correct option for the code given below:

public class Main {
  public static void main(String args[]) {
  
   try {
        int a = 34;
        int b = a * --a;
        if(b > (a * a))
            throw new B();
    }
    catch(A object1)     { 
       System.out.println("37"); 
    }
    catch(B object2)  { 
       System.out.println("70"); 
    }
    finally{
        System.out.println("102");
        
    }
  }
} 
class A extends Exception {
    
}
class B extends A  {
    
}
 
  
  •  

    Error that exception B has already been caught


  •  

    Clean code without errors and warnings print

    37

    102

  •  

    With one warning, Unreachable catch clause code prints

    37

    102

  •  

    With one warning, Unreachable catch clause code prints

    102

  •  

    Clean code without errors and warnings print

    102


10. Choose the correct option for the code given below:

class Main {
    public static void main(String[] args) {
        try {
            int array[]= {1, 18, 25, 32, 87};
            for (int i = 0; i <= 5; i++) {
                System.out.print(array[i] + " ");
            }
        }
        catch (ArrayIndexOutOfBoundsException e) {
            System.out.println ("37");
        }
         
        catch (Exception e) {
            System.out.println (e);
        }
         
        
    }
}
 
  
  •  

    Error that exception B has already been caught

  •  

    Code prints:

    1 18 25 32 87 37

  •  

    With Out of bound exception code only prints

    37

  •  

    Code prints:

    1 18 25 32 87

  •  

    Error: exception ArrayIndexOutOfBoundsException has already been caught


11. Choose the correct option for the code given below:

class Main {
    public static void main(String[] args) {
        try {
            int array[]= {9, 16, 23, 49, 78};
            for (int i = 0; i <= 5; i++) {
                System.out.print(array[i] + " ");
            }
        }
        catch (Exception e) {
                  System.out.println (e);
        }
        catch (ArrayIndexOutOfBoundsException e) {
            System.out.println ("21");
        }     
        
    }
}
 
  
  •  

    Error that exception B has already been caught

  •  

    Code prints:

    9 16 23 49 78 21

  •  

    With Out of bound exception code only prints

    21

  •  

    Code prints:

    9 16 23 49 78

  •  

    Error: exception ArrayIndexOutOfBoundsException has already been caught


12. Predict the correct output of below given code:

interface A {
	void function1(int x, int y);
	default void function2(int x, int y) {
	System.out.println(x + y);
	}
}
class Main {
	public static void main(String args[]) {
		A a = (int x, int y)->System.out.println(2*x + 2*y);
		a.function1(27,59);
		a.function2(41,74);
	}
}
  •  

    172

    115

  •  

    code throws a warning that method function1(int,int) is not defined in interface A, and print:

    172

  •  

    Error: Method function1(int,int) is not defined in interface A

  •  

    code throws a warning that method function1(int,int) is not defined in interface A, and print:

    115


13. Predict the correct output of below given code:

interface A {
	void function1(int x, int y);
	default void function2(int x, int y) {
	System.out.println(x + y);
	}
}
class Main {
	public static void main(String args[]) {
		A a = ()->System.out.println("8");
		a.function1();
		a.function2(22,54);
	}
}
  •  

    Error: incompatible types: incompatible parameter types in lambda expression


  •  

    8

    76

  •  

    code throws a warning that method function1(int,int) is not defined in interface A, and print:

    8

  •  

    Error: Method function1(int,int) is not defined in interface A

  •  

    code throws a warning that method function1(int,int) is not defined in interface A, and print:

    76


14. Predict the correct output of below given code:

interface A {
	void function1();
	default void function2(int x, int y) {
	System.out.println(x + y);
	}
}
class Main {
	public static void main(String args[]) {
		A a = ()->System.out.println("11");
		a.function1();
		a.function2(26,58);
	}
}
  •  

    Error: incompatible types: incompatible parameter types in lambda expression

  •  

    11

    84

  •  

    code throws a warning that method function1(int,int) is not defined in interface A, and print:

    11

  •  

    Error: Method function1(int,int) is not defined in interface A

  •  

    code throws a warning that method function1(int,int) is not defined in interface A, and print:

    84


15. Predict the correct output of below given code:

interface Interface {
	void property1(int x);
	default void property2(int x, int y ) {
	System.out.println(++x + y++);
	}


}
class Main {
	public static void main(String args[]) {
		Interface a = (int p)->System.out.println(p++);
		a.property1(11);
		a.property2(93,125);
	}
}
  •  

    Error: incompatible types: incompatible parameter types in lambda expression

  •  

    12

    219

  •  

    code throws a warning that method function1(int,int) is not defined in interface A, and print:

    11

  •  

    11

    219

  •  

    11

    218

  •  

    code throws a warning that method function1(int,int) is not defined in interface A, and print:

    12


16. Predict the right option for the given code snippet:


interface B {
     Number m(int x) {
         return x;
     }
}
public class Main {
    public static void main(String args[]) {
        B b = (int x) -> (9 * 2); 
        System.out.print(b.m());
    }
}

  • 2

  •  

    18

  •  

    Error: method m in interface B can be applied to given types

  •  

    9

  •  

    Error: interface B method m() is abstract and cannot have body


17. Predict the right option for the given code snippet:


interface Fruit {
     Number apple(int x);
}
public class Main {
    public static void main(String args[]) {
        Fruit b = (int x) -> (13 * 5); 
        System.out.print(b.apple(18));
    }
}
  •  

    18

  •  

    65

  •  

    Error: method apple in interface Fruit cannot be applied to given types

  •  

    324

  •  

    Error: interface Fruit method apple() body is not defined.


18. Predict the correct output of below given code snippet:

import java.util.*;
public class Main {
	public static void main(String[] args) {
		int array[] = {9, 15, 22, 13};
		int keyElement = 24;
		Arrays.fill(array, ++keyElement);
		System.out.println(Arrays.toString(array));
	}
}
  •  

    [24, 24, 24, 24]

  •  

    [25, 25, 25, 25]

  •  

    Error: cannot find symbol Arrays.fill(array, ++keyElement);

  •  

    [9, 15, 22, 13]


19. Predict the correct output of below given code snippet:

import java.util.*;
public class Main {
	public static void main(String[] args) {
		int array[] = { 14, 78, 42, 7, 71 };
		System.out.println(Arrays.toString(array));
		System.out.println(Arrays.toString(Arrays.copyOf(array, 8)));
	}
}
  •  

    [14, 78, 42, 7, 71]

    [14, 78, 42, 7, 71, 0, 0, 0]

  •  

    [14, 78, 42, 7, 71]

    [0, 0, 0, 0, 0, 0, 0, 0]

  •  

    [14, 78, 42, 7, 71]

    [0, 0, 0, 71, 7, 42, 78, 14]

  •  

    [14, 78, 42, 7, 71]

    [0, 0, 0, 14, 78, 42, 7, 71]


20. Predict the correct output of below given code snippet:

import java.util.*;
public class Main {
	public static void main(String[] args) {
		int array[] = { 264, 241, 128, 60, 42 };
		Arrays.sort(array, 1, 2);
		System.out.println(Arrays.toString(array));
	}
}
  •  

    [264, 241, 128, 60, 42]

  •  

    [42, 60, 128, 241, 264]

  •  

    error: cannot find symbol Arrays.sort(array);

  •  

    [241, 264, 128, 60, 42]


21. Predict the correct output of below given code snippet:

Assume current date: 1984-March-28

current time: 7:16:53 AM (HH:MM:SS)

import java.text.*;
import java.util.*;
class Main {
	public static void main(String[] args) {
		Date date = new Date();
		System.out.println(DateFormat.getDateInstance().format(date));
		System.out.println(DateFormat.getTimeInstance().format(date));
		System.out.println(DateFormat.getTimeInstance(DateFormat.MEDIUM).format(date));
		System.out.println(DateFormat.getTimeInstance(DateFormat.SHORT).format(date));
	}
}
  •  

    Mar 28, 1984

    7:16:53 AM

    7:16:53 AM

    7:16 AM

  •  

    Mar 28, 1984

    7:16:53 AM

    7:16:53 AM

    7:16:53 AM

  •  

    1984/March/28

    7:16:53 AM

    7:16:53 AM

    7:16:53 AM

  •  

    1984-March-28

    7:16:53 AM

    7:16:53 AM

    7:16 AM


22. Predict the correct output of below given code snippet:

Assume current date: 2019-March-8

current time: 10:32:11 AM (HH:MM:SS)

import java.text.*;
import java.util.*;
class Main {
	public static void main(String[] args) {
		Date date = new Date();
        System.out.println(DateFormat.getDateTimeInstance().format(date));
		System.out.println(DateFormat.getTimeInstance(DateFormat.LONG).format(date));
	}
}
  •  

    Mar 8, 2019, 10:32:11 AM

    10:32:11 AM GMT

  •  

    Error: cannot find symbol System.out.println(DateFormat.getDateTimeInstance().format(date));


  •  

    Mar 8, 2019, 10:32:11 AM

    10:32:11

  •  

    Mar 8, 2019

    10:32:11 AM GMT


23. Analyse the code and select the correct option:

import java.util.Arrays;
public class Main {
	public static void main(String[] args) {
		int[] array1 = new int [] {1, 2, 1};
		int[] array2 = new int [] {1, 2, 1};
		Boolean a = Arrays.equals(array1, array2);
		if(a) {
		    System.out.print("102");
		}
		else {
		    System.out.print("184");
		}
	}
}
  •  

    102

  •  

    184

  •  

    incompatible types: boolean cannot be converted to int

  •  

    Error: cannot find symbol Boolean a = Arrays.equals(array1, array2);


24. Predict the right option for the below given code snippet.

class X extends Exception{ }
class Y extends X { }
public class Main {
     public static void main(String [] args) {
         try {    
             demo();     
             
         }
         catch (X obj) { 
             System.out.println (obj); 
             
         }
         
     } 
    public static void demo() throws Y {
        throw new Y();
        
    }
}
  •  

    X

  •  

    Y

  •  

    Compilation Error: Unreported Exception X

  •  

    Compilation Error: Unreported Exception Y



25. Predict the right option for the below given code snippet.

class X extends Exception{ }
class Y extends X { }
public class Main {
     public static void main(String [] args) {
         try {    
             demo();     
             
         }
         catch (X obj) { 
             System.out.println (obj); 
             
         }
         
     } 
    public static void demo() throws Y {
        throw new X();
        
    }
}
  •  

    X

  •  

    Y

  •  

    Compilation Error: Unreported Exception X

  •  

    Compilation Error: Unreported Exception Y




GoHonoring

Posted by GoHonoring

Technology to enrich lives and drive progress. By empowering users with timely and relevant information, we strive to foster a community of informed and inspired individuals who share our passion for all things tech. Join us on our journey as we continue to honor the spirit of innovation and exploration in the digital age.

Post a Comment

0 Comments