2.8. Sample exam questions

Q2-1.

Given:

int myChar = 97;
int yourChar = 98;
System.out.print((char)myChar + (char)yourChar);

int age = 20;
System.out.print(" ");
System.out.print((float)age);

What is the output?

1. 195 20.0
2. 195 20
3. ab 20.0
4. ab 20
5. Compilation error
6. Runtime exception

Q2-2.

Which of the options are correct for the following code?

public class Prim {                                // line 1
    public static void main(String[] args) {       // line 2
        char a = 'a';                              // line 3
        char b = -10;                              // line 4
        char c = '1';                              // line 5
        integer d = 1000;                          // line 6
        System.out.println(++a + b++ * c - d);     // line 7
    }                                              // line 8
}                                                  // line 9

1. Code at line 4 fails to compile.
2. Code at line 5 fails to compile.
3. Code at line 6 fails to compile.
4. Code at line 7 fails to compile.

Q2-3.

What is the output of the following code?

public class Foo {
    public static void main(String[] args) {
        int a = 10;
        long b = 20;
        short c = 30;
        System.out.println(++a + b++ * c);
    }
}

1. 611
2. 641
3. 930
4. 960

Q2-4.

Given:

Boolean buy = new Boolean(true);
Boolean sell = new Boolean(true);

System.out.print(buy == sell);
boolean buyPrim = buy.booleanValue();
System.out.print(!buyPrim);

System.out.print(buy && sell);

What is the output?

1. falsefalsefalse
2. truefalsetrue
3. falsetruetrue
4. falsefalsetrue
5. Compilation error
6. Runtime exception

Q2-5.

Which of the following options contain correct code to declare and initialize variables to store whole numbers?

1. bit a = 0;
2. integer a2 = 7;
3. long a3 = 0x10C;
4. short a4 = 0512;
5. double a5 = 10;
6. byte a7 = -0;
7. long a8 = 123456789;

Q2-6.

Select the options that, when inserted at // INSERT CODE HERE, will make the following code output a value of 11:

public class IncrementNum {
    public static void main(String[] args) {
        int ctr = 50;
        // INSERT CODE HERE
        System.out.println(ctr % 20);
    }
}

1. ctr += 1;
2. ctr =+ 1;
3. ++ctr;
4. ctr = 1;

Q2-7.

What is the output of the following code?

int a = 10;
int b = 20;
int c = (a * (b + 2)) - 10-4 * ((2*2) - 6;
System.out.println(c);

1. 218
2. 232
3. 246
4. Compilation error

Q2-8.

What is true about the following lines of code?

boolean b = false;
int i = 90;
System.out.println(i >= b);

1. Code prints true
2. Code prints false
3. Code prints 90 >= false
4. Compilation error

Q2-9.

Examine the following code and select the correct options:

public class Prim {                                          // line 1
    public static void main(String[] args) {                 // line 2
        int num1 = 12;                                       // line 3
        float num2 = 17.8f;                                  // line 4
        boolean eJavaResult = true;                          // line 5
        boolean returnVal = num1 >= 12 && num2 < 4.567       // line 6
                             || eJavaResult == true;
        System.out.println(returnVal);                       // line 7
    }                                                        // line 8
}                                                            // line 9

1. Code prints false
2. Code prints true
3. Code will print true if code on line 6 is modified to the following:
   
   

   boolean returnVal = (num1 >= 12 && num2 < 4.567) || eJavaResult == true;

4. Code will print true if code on line 6 is modified to the following:
   
   

   boolean returnVal = num1 >= 12 && (num2 < 4.567 || eJavaResult == false);

Q2-10.

Given:

boolean myBool = false;                               // line 1
int yourInt = 10;                                     // line 2
float hisFloat = 19.54f;                              // line 3
System.out.println(hisFloat = yourInt);               // line 4
System.out.println(yourInt > 10);                     // line 5
System.out.println(myBool = false);                   // line 6

What is the result?

1. 
   

   true
   true
   false

2. 
   

   10.0
   false
   false

3. 
   

   false
   false
   false

4. Compilation error