Java Practice MCQs CBT 5 CSE310

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. 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

Java Practice MCQs CBT 5 CSE310

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