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Home Java Programming Operators and Assignments See What Others Are Saying!
  • Question
  • What will be the output of the program?
    class SC2 
    {
        public static void main(String [] args) 
        {
            SC2 s = new SC2();
            s.start();
        }
    
        void start() 
        {
            int a = 3;
            int b = 4;
            System.out.print(" " + 7 + 2 + " ");
            System.out.print(a + b);
            System.out.print(" " + a + b + " ");
            System.out.print(foo() + a + b + " ");
            System.out.println(a + b + foo());
        }
    
        String foo() 
        {
            return "foo";
        }
    }
    


  • Options
  • A. 9 7 7 foo 7 7foo
  • B. 72 34 34 foo34 34foo
  • C. 9 7 7 foo34 34foo
  • D. 72 7 34 foo34 7foo

  • Correct Answer
  • 72 7 34 foo34 7foo 

    Explanation
    Because all of these expressions use the + operator, there is no precedence to worry about and all of the expressions will be evaluated from left to right. If either operand being evaluated is a String, the + operator will concatenate the two operands; if both operands are numeric, the + operator will add the two operands.

    More questions

    • 1. What will be the output of the program?
      public class A
      { 
          void A() /* Line 3 */
          {
              System.out.println("Class A"); 
          } 
          public static void main(String[] args) 
          { 
              new A(); 
          } 
      }
      

    • Options
    • A. Class A
    • B. Compilation fails.
    • C. An exception is thrown at line 3.
    • D. The code executes with no output.
    • Discuss
    • 2. What will be the output of the program?
      class Test 
      {
          public static void main(String [] args) 
          {
              Test p = new Test();
              p.start();
          }
      
          void start() 
          {
              boolean b1 = false;
              boolean b2 = fix(b1);
              System.out.println(b1 + " " + b2);
          }
      
          boolean fix(boolean b1) 
          {
              b1 = true;
              return b1;
          }
      }
      

    • Options
    • A. true true
    • B. false true
    • C. true false
    • D. false false
    • Discuss
    • 3. What will be the output of the program?
      class Test 
      {
          static int s;
          public static void main(String [] args) 
          {
              Test p = new Test();
              p.start();
              System.out.println(s);
          }
      
          void start() 
          {
              int x = 7;
              twice(x);
              System.out.print(x + " ");
          }
      
          void twice(int x) 
          {
              x = x*2;
              s = x;
          }
      }
      

    • Options
    • A. 7 7
    • B. 7 14
    • C. 14 0
    • D. 14 14
    • Discuss
    • 4. You want a class to have access to members of another class in the same package. Which is the most restrictive access that accomplishes this objective?

    • Options
    • A. public
    • B. private
    • C. protected
    • D. default access
    • Discuss
    • 5. What will be the output of the program?
      class Super
      { 
          public int i = 0; 
      
          public Super(String text) /* Line 4 */
          {
              i = 1; 
          } 
      } 
      
      class Sub extends Super
      {
          public Sub(String text)
          {
              i = 2; 
          } 
      
          public static void main(String args[])
          {
              Sub sub = new Sub("Hello"); 
              System.out.println(sub.i); 
          } 
      }
      

    • Options
    • A. 0
    • B. 1
    • C. 2
    • D. Compilation fails.
    • Discuss
    • 6. What will be the output of the program (in jdk1.6 or above)?
      public class BoolTest 
      {
          public static void main(String [] args) 
          {
              Boolean b1 = new Boolean("false");
              boolean b2;
              b2 = b1.booleanValue();
              if (!b2) 
              {
                  b2 = true;
                  System.out.print("x ");
              }
              if (b1 & b2) /* Line 13 */
              {
                  System.out.print("y ");
              }
              System.out.println("z");
          }
      }
      

    • Options
    • A. z
    • B. x z