Writing Methods Practice

Sample questions

5 of 28 — sign in to practice the rest with adaptive difficulty and mastery tracking.

1. Sample 1difficulty 1/5

   public class C {
       public double computeAverage(int[] nums) {
           return 0.0;
       }
   }
   // ...

   Which is the method's signature?

   • A

     computeAverage(int[])

     check_circle
   • B

     public double computeAverage(int[] nums)

   • C

     double computeAverage

   • D

     computeAverage()

   Why

   A method's signature consists of its name and parameter types only, not return type or modifiers.

   View full solution & statsarrow_forward

2. Sample 2difficulty 2/5

   public class Tester {
       public int sign(int n) {
           if (n > 0) return 1;
           if (n < 0) return -1;
           return 0;
       }
   }
   // ...
   Tester t = new Tester();
   System.out.println(t.sign(0));

   What is printed?

   • A

     Compile-time error

   • B

     -1

   • C

     1

   • D

     0

     check_circle

   Why

   n is 0, so neither if branch returns; the final return 0 executes.

   View full solution & statsarrow_forward

3. Sample 3difficulty 2/5

   public class K {
       private int n;
       public K(int n) { this.n = n; }
       public String toString() { return "K(" + n + ")"; }
   }
   // ...
   K k = new K(7);
   System.out.println("Got " + k);

   What is printed?

   • A

     Got K(7)

     check_circle
   • B

     Compile-time error

   • C

     Got 7

   • D

     Got K

   Why

   String concatenation invokes toString on the object, producing "Got K(7)".

   View full solution & statsarrow_forward

4. Sample 4difficulty 2/5

   public static int isPositive(int n) {
       return n > 0;
   }

   What is wrong?

   • A

     The method must be void

   • B

     Nothing is wrong

   • C

     Return type must be boolean to match the expression n > 0

     check_circle
   • D

     n must be checked with .equals

   Why

   n > 0 yields a boolean; an int return type produces a compile error. Change the type to boolean.

   View full solution & statsarrow_forward

5. Sample 5difficulty 2/5

   public static int max(int a, int b) {
       if (a > b) {
           return a;
       }
       // line 4
   }

   What must be added at line 4 to make the method compile and work?

   • A

     return b;

     check_circle
   • B

     Nothing; the code compiles as is

   • C

     break;

   • D

     return 0;

   Why

   Java requires every code path of a non-void method to return a value. When a <= b, no return executes, so the method must return b.

   View full solution & statsarrow_forward