1. How do you simplify the max method in the following, using the conditional operator?

    1:     /** Return the max of two numbers */ 2:     public static int max ( int num1, int num2 ) { 3:         int result; 4:  5:         if ( num1 > num2 ) 6:             result = num1; 7:         else 8:             result = num2; 9:         return result;10:     }

2. Write method headers (just the declaration, not the bodies) for the following methods:
   1. Compute a sales commission, given the sales amount and the commission rate.
   2. Display the calendar for a month, given the month and year.
   3. Compute a square root of a number.
   4. Test whether a number is even, and returning true if it is.
   5. Display a message a specified number of times.
   6. Compute the monthly payment, given the loan amount, number of years, and annual interest rate.
   7. Find the corresponding uppercase letter, given a lowercase letter.
3. Identify and correct the errors in the following program:

    1: public class Test { 2:     public static method1(int n, m) { 3:         n += m; 4:         method2 (3. 4); 5:     } 6:  7:     public static int method2(int n) { 8:         if ( n > 0 ) return 1; 9:         else if (n == 0) return 0;10:         else if (n < 0) return -1;11:     }12: }

4. What is pass-by-value? Show the results of the following two programs.

   1.  1: public class Test { 2:     public static void main ( String [] args ) { 3:         int max = 0; 4:         max(1, 2, max); 5:         System.out.println(max); 6:     } 7:  8:     public static void max ( int value1, int value2, int max ) { 9:         if ( value1 > value2 )10:             max = value1;11:         else12:             max = value2;13:     }14: }

   2.  1: public class Test { 2:     public static void main ( String [] args ) { 3:         int i = 1; 4:         while ( i <= 6 ) { 5:             method1( i, 2 ); 6:             i++; 7:         } 8:     } 9: 10:     public static void method1 ( int i, int num ) {11:         for ( int j = 1; j <= i; j++ ) {12:             System.out.print( num + " " );13:             num *= 2;14:         }15:         System.out.println();16:     }17: }

5. What is wrong with the following class?

   1: public class Test {2:     public static void method ( int x ) {3:     }4:     public static int method ( int y ) {5:         return y;6:     }7: }

6. 1. Write an expression that obtains a random integer between 34 and 55, inclusive.
   2. Write an expression that obtains a random integer between 0 and 999, inclusive.
   3. Write an expression that obtains a random number between 5.5 (inclusive) and 55.5 (exclusive).
   4. Write an expression that obtains a random lowercase (English) letter.
7. How many times is the factorial method in the following invoked, for the call factorial(6)?

    1: import java.util.Scanner; 2:  3: public class ComputeFactorial { 4:     public static void main ( String [] args ) { 5:         Scanner input = new Scanner( System.in ); 6:         System.out.print( "Enter a nonnegative integer: " ); 7:         int n = input.nextInt(); 8:  9:         // Display factorial10:         System.out.println( "Factorial of " + n + " is " + factorial(n) );11:     }12: 13:     /** Return the factorial for the specified number */14:     public static long factorial ( int n ) {15:         if ( n == 0 ) // Base case16:             return 1;17:         else18:             return n * factorial( n - 1 ); // Recursive call19:     }20: }

8. Suppose that the class F is defined as shown below. Let f be an instance of F. Which of the following statements are syntactically correct?

   1: public class F {2:   int i;3:   static String s;4:   void iMethod () {5:   }6:   static void sMethod () {7:   }8: }

   1. System.out.println(f.i);
   2. System.out.println(f.s);
   3. f.iMethod();
   4. f.sMethod();
   5. System.out.println(F.i);
   6. System.out.println(F.s);
   7. F.iMethod();
   8. F.sMethod();
9. Add the static keyword in the place of ?, if appropriate, in the code below.

    1: public class Test { 2:     private int count; 3:     public ? void main ( String [] args ) { 4:         ... 5:     } 6:     public ? int getCount () { 7:         return count; 8: } 9: public ? int factorial ( int n ) {10:     int result = 1;11:     for ( int i = 1; i <= n; i++ )12:         result *= i;13:     return result;14: }15: }

10. Can each of the following statements be compiled?
    1. Integer i = new Integer("23");
    2. Integer i = new Integer(23);
    3. Integer i = Integer.valueOf("23");
    4. Integer i = Integer.parseInt("23", 8);
    5. Double d = new Double();
    6. Double d = Double.valueOf("23.45");
    7. int i = (Integer.valueOf("23")).intValue();
    8. double d = (Double.valueOf("23.4")).doubleValue();
    9. int i = (Double.valueOf("23.4")).intValue();
    10. String s = (Double.valueOf("23.4")).toString();
11. 1. How do you convert an integer into a string?
    2. How do you convert a numeric string into an integer?
    3. How do you convert a double number into a string?
    4. How do you convert a numeric string into a double value?