Review Ch 5 static Multiple Choice Test Creating Class Methods

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Transcription:

Review Ch 5 static Multiple Choice Test Creating Class Methods 01. A class method call always requires that the class identifier precedes the method identifier. may be called with the method identifier if in the same.java file. is only possible after a new object is constructed. uses the class identifier only for readability. 10. Which of the following Java keywords are used frequently in the declaration of a class method? void public static All of the above 11. Consider the Java program below. public class Q11 public static void main(string args[ ]) boohiss(); // line 1 boohiss.q11(); // line 2 Q11.boohiss(); // line 3 public static void boohiss() System.out.println("Calling boohiss"); Which of the statements in the main method is a proper method call? Line 1 only Line 2 only Line 3 only Lines 1 and 3 Exposure Java 2013, APCS Edition Chapter 7 Test Page 1 Updated: 10-29-13

100. Consider the Java program below. public class Q12A public static void main(string args[ ]) boohiss(); // line 1 Q12A.boohiss.(); // line 2 Q12B.boohiss(); // line 3 class Q12B public static void boohiss() System.out.println("Calling boohiss"); Which of the statements in the main method is a proper method call? Line 1 only Line 3 only Lines 1 and 2 Lines 1 and 3 Exposure Java 2013, APCS Edition Chapter 7 Test Page 2 Updated: 10-29-13

101. What is the output of the following program? public class Q13 method1(); public static void method1() method2(); System.out.println("Calling method 1"); public static void method2() method3(); System.out.println(""); public static void method3() System.out.println(""); Calling method 1 Calling method 1 Calling method 1 Exposure Java 2013, APCS Edition Chapter 7 Test Page 3 Updated: 10-29-13

110. What is the output of the following program? public class Q14 method1(); method3(); method2(); public static void method1() System.out.println("Calling method 1"); public static void method2() System.out.println(""); public static void method3() System.out.println(""); Calling method 1 Calling method 1 Calling method 1 Exposure Java 2013, APCS Edition Chapter 7 Test Page 4 Updated: 10-29-13

111. What is the output of the following program? public class Q15 method1(); method2(); method3(); class Tango public static void method1() System.out.println("Calling method 1"); public static void method2() System.out.println(""); public static void method3() System.out.println(""); Calling method 1 Calling method 1 Calling method 1 Exposure Java 2013, APCS Edition Chapter 7 Test Page 5 Updated: 10-29-13

1000. What is the output of the following program? public class Q16 Tango.method1(); class Tango public static void method1() method2(); System.out.println("Calling method 1"); public static void method2() System.out.println(""); Method3(); public static void method3() System.out.println(""); Calling method 1 Calling method 1 Calling method 1 Exposure Java 2013, APCS Edition Chapter 7 Test Page 6 Updated: 10-29-13

1001. Which of the following statements is true about the use of parameters with Java methods? Methods without parameters can compile, but will not execute correctly. All method declarations require parameters. Many methods use parameters. The use of parameters is optional to increase program readability. 1010. Which of the following statements is true about a method declaration with multiple parameters? All parameters must be the same data type. All parameters must be different data types. Parameter data types may be the same or they may be different. The parameter declarations depend on the method call. 1011. Which of the following method headings uses proper parameter declarations? public static void guess(double rate, double hours, int deductions); public static void guess(double rate, hours, int deductions); public static void guess(rate, hours, deductions); public static void guess(7.85, 42.5, 3); 1100. Which of the following method calls might use argumentss correctly? (arguments in call, parameters in definition) guess(double rate, double hours, int deductions); guess(double rate, hours, int deductions); guess(int rate, hours, deductions); guess(7.85, 42.5, 3); 1101. The arguments in the method call and the parameters in the method heading must be the same I. quantity. II. sequence. III. datetype. (E) I only II only I & II only II & III only I, II & III Exposure Java 2013, APCS Edition Chapter 7 Test Page 7 Updated: 10-29-13

1110. What is the output of the following program? public class Q23 Q23.method1(1); method2(2); public static void method1(int n) System.out.println("Calling method " + n); public static void method2(int n) System.out.println("Calling method " + n); method3(n); public static void method3(int n) System.out.println("Calling method " + n); Calling method 1 Calling method 1 Calling method 1 Exposure Java 2013, APCS Edition Chapter 7 Test Page 8 Updated: 10-29-13

1111. What is the output of the following program? public class Q24 int n = 4; method1(n); method2(n + 2, 3); method3(n + n); public static void method1(int x) System.out.println("x = " + x); public static void method2(int x, int y) System.out.println("x + y = " + (x + y) ); public static void method3(int n) int x = 4; System.out.println("x = " + n+x); 4 63 8 x = 4 x + y = 9 x = 12 x = 4 x + y = 9 x = 8 4 Exposure Java 2013, APCS Edition Chapter 7 Test Page 9 Updated: 10-29-13

hex 0010. What distinguishes the declaration of a mutator method? The public keyword in the method heading The static keyword in the method heading The void keyword in the method heading The main keyword in the method heading 0011. What distinguishes the declaration of an accessor method? The return keyword in the method body The static keyword in the method heading The data type declaration in the method heading (do not confuse with parameter data types) Both A and C 0012. What distinguishes a call to a mutator method? The method call is the only part of a complete program statement. The method call provides a value, which is used in the program statement. The method call includes the void keyword. The method call includes the return keyword. 0013. What distinguishes a call to a accessor method? The method call is the only part of a complete program statement. The method call provides a value, which is used in the program statement. The method call includes the void keyword. The method call includes the return keyword. 0014. What distinguishes a class method definition? The public keyword in the method heading The static keyword in the method heading The void keyword in the method heading The main keyword in the method heading Exposure Java 2013, APCS Edition Chapter 7 Test Page 10 Updated: 10-29-13

0015. What is the output of the following program? public class Q29 int x = 25; int y = 10; Calc.add(x,y); Calc.sub(x,y); Calc.mul(x,y); Calc.div(x,y); class Calc public static void add(int p, int q) int result = p + q; System.out.println(p + " + " + q + " = " + result); public static void sub(int p, int q) int result = p - q; System.out.println(p + " - " + q + " = " + result); public static void mul(int p, int q) int result = p * q; System.out.println(p + " * " + q + " = " + result); public static void div(int p, int q) int result = p / q; System.out.println(p + " / " + q + " = " + result); 25 + 10 25 + 10 = 35 35 25-10 25-10 = 15 15 25 * 10 25 * 10 = 250 250 25 / 10 25 / 10 = 2 2 Exposure Java 2013, APCS Edition Chapter 7 Test Page 11 Updated: 10-29-13

0016. What is the output of the following program? public class Q30 int x = 25; int y = 10; System.out.println(Calc.add(x,y)); System.out.println(Calc.sub(x,y)); System.out.println(Calc.mul(x,y)); System.out.println(Calc.div(x,y)); class Calc public static void add(int p, int q) int result = p + q; System.out.println(p + " + " + q + " = " + result); public static void sub(int p, int q) int result = p - q; System.out.println(p + " - " + q + " = " + result); public static void mul(int p, int q) int result = p * q; System.out.println(p + " * " + q + " = " + result); public static void div(int p, int q) int result = p / q; System.out.println(p + " / " + q + " = " + result); 25 + 10 25 + 10 = 35 35 25-10 25-10 = 15 15 25 * 10 25 * 10 = 250 250 25 / 10 25 / 10 = 2 2 Exposure Java 2013, APCS Edition Chapter 7 Test Page 12 Updated: 10-29-13

0017. What is the output of the following program? public class Q31 int x = 25; int y = 10; System.out.println(x + " + " + y + " = " + Calc.add(x,y)); System.out.println(x + " - " + y + " = " + Calc.sub(x,y)); System.out.println(x + " * " + y + " = " + Calc.mul(x,y)); System.out.println(x + " / " + y + " = " + Calc.div(x,y)); class Calc public static int add(int p, int q) int result = p + q; return result; public static int sub(int p, int q) int result = p - q; return result; public static int mul(int p, int q) return p * q; public static int div(int p, int q) return p / q; 25 + 10 25 + 10 = 35 35 25-10 25-10 = 15 15 25 * 10 25 * 10 = 250 250 25 / 10 25 / 10 = 2 2 Exposure Java 2013, APCS Edition Chapter 7 Test Page 13 Updated: 10-29-13

0018. What is the output of the following program? public class Q32 int x = 25; int y = 10; Calc.add(x,y); Calc.sub(x,y); Calc.mul(x,y); Calc.div(x,y); class Calc public static int add(int p, int q) int result = p + q; return result; public static int sub(int p, int q) int result = p - q; return result; public static int mul(int p, int q) return p * q; public static int div(int p, int q) return p / q; 25 + 10 25 + 10 = 35 35 25-10 25-10 = 15 15 25 * 10 25 * 10 = 250 250 25 / 10 25 / 10 = 2 2 No output Exposure Java 2013, APCS Edition Chapter 7 Test Page 14 Updated: 10-29-13

0019. What is the output of the following program? public class Q33 int x = 25; int y = 10; Calc.add(x,y); Calc.sub(x,y); Calc.mul(x,y); Calc.div(x,y); class Calc public static void add(int p, int q) int result = p - q; System.out.println(p + " - " + q + " = " + result); public static void sub(int p, int q) int result = p + q; System.out.println(p + " + " + q + " = " + result); public static void mul(int p, int q) int result = p / q; System.out.println(p + " / " + q + " = " + result); public static void div(int p, int q) int result = p * q; System.out.println(p + " * " + q + " = " + result); 25 + 10 = 35 25 + 10 = 15 25-10 = 15 1 25-10 = 15 25-10 = 35 25 + 10 = 35 2 25 * 10 = 250 25 * 10 = 2 25 / 10 = 2 3 25 / 10 = 2 25 / 10 = 250 25 * 10 = 250 4 (E) Exposure Java 2013, APCS Edition Chapter 7 Test Page 15 Updated: 10-29-13

001A. What is the output of the following program? public class Q34 int x = 25; int y = 10; System.out.println(x + " + " + y + " = " + Calc.add(x,y)); System.out.println(x + " - " + y + " = " + Calc.sub(x,y)); System.out.println(x + " * " + y + " = " + Calc.mul(x,y)); System.out.println(x + " / " + y + " = " + Calc.div(x,y)); class Calc public static int add(int p, int q) int result = p q; return result; public static int sub(int p, int q) int result = p + q; return result; public static int mul(int p, int q) return p / q; public static int div(int p, int q) return p * q; 25 + 10 = 35 25 + 10 = 15 25-10 = 15 1 25-10 = 15 25-10 = 35 25 + 10 = 35 2 25 * 10 = 250 25 * 10 = 2 25 / 10 = 2 3 25 / 10 = 2 25 / 10 = 250 25 * 10 = 250 4 (E) Exposure Java 2013, APCS Edition Chapter 7 Test Page 16 Updated: 10-29-13

001B. What is the output of the following program? public class Q35 int x = 25; int y = 10; System.out.println(Calc.add(x,y)); System.out.println(Calc.sub(x,y)); System.out.println(Calc.mul(x,y)); System.out.println(Calc.div(x,y)); class Calc public static String add(int p, int q) int sum = p + q; String result = p + " + " + q + " = " + sum; return result; public static String sub(int p, int q) int diff = p - q; String result = p + " - " + q + " = " + diff; return result; public static String mul(int p, int q) int prod = p * q; String result = p + " * " + q + " = " + prod; return result; public static String div(int p, int q) int quot = p + q; String result = p + " / " + q + " = " + quot; return result; 25 + 10 = 35 25 + 10 = 15 25-10 = 15 1 25-10 = 15 25-10 = 35 25 + 10 = 35 2 25 * 10 = 250 25 * 10 = 2 25 / 10 = 2 3 25 / 10 = 2 25 / 10 = 250 25 * 10 = 250 4 (E) Exposure Java 2013, APCS Edition Chapter 7 Test Page 17 Updated: 10-29-13

001C. What is the output of the following program? public class Q36 int x = 25; int y = 10; System.out.println(Calc.add(x,y)); System.out.println(Calc.sub(x,y)); System.out.println(Calc.mul(x,y)); System.out.println(Calc.div(x,y)); class Calc public static String add(int p, int q) int sum = p + q; String result = p + " + " + q + " = " + sum; return 1 ; public static String sub(int p, int q) int diff = p - q; String result = p + " - " + q + " = " + diff; return 2 ; public static String mul(int p, int q) int prod = p * q; String result = p + " * " + q + " = " + prod; return 3 ; public static String div(int p, int q) int quot = p + q; String result = p + " / " + q + " = " + quot; return 4 ; 25 + 10 = 35 25 + 10 = 15 25-10 = 15 1 25-10 = 15 25-10 = 35 25 + 10 = 35 2 25 * 10 = 250 25 * 10 = 2 25 / 10 = 2 3 25 / 10 = 2 25 / 10 = 250 25 * 10 = 250 4 (E) Exposure Java 2013, APCS Edition Chapter 7 Test Page 18 Updated: 10-29-13

001D. The Java compiler checks for (E) correct program syntax. correct program logic. consistent program statement indentations. the use of meaningful variable identifiers. the proper implementation of methods. 001E. Which of the following are fundamental program design considerations? (E) Programs should use mnemonic identifiers. Control structures should use a consistent indentation style. Specific tasks should be placed in procedures or functions, called methods. The main method should be used for program sequence, not large numbers of program statements. All of the above 001F. Which of the following variable names is not a mnemonic identifier? (E) netpay deductions k checkingbalance grosspay 0020. Which of the following boohiss methods will receive and integer and return triple that amount? public static int boohiss() return j + j + j; public static void boohiss( int j ) return j + j + j; public static int boohiss( char j ) return 3 * j; public static int boohiss( int j ) return 3 * j; 0021. Which of the following boohiss methods will receive 1 character and return its ASCII value? public static int boohiss( char c ) return (int) c; public static char boohiss( int c ) return (int) c; public static char boohiss( char c ) return (int) c; public static char boohiss( int c ) return (char) c; (E) public static int boohiss( char c ) return (char) c; Exposure Java 2013, APCS Edition Chapter 7 Test Page 19 Updated: 10-29-13

0022. Which of the following boohiss methods will receive 1 integer and return the next one? public static char boohiss( char c ) c++; return c; public static char boohiss( char c ) return c++; public static int boohiss( int c ) c++; return c; public static int boohiss( int c ) return c++; 0023. Which of the following boohiss methods will receive 1 character and return the next one? public static char boohiss( char c ) c++; return c; public static char boohiss( char c ) return c++; public static int boohiss( int c ) c++; return c; public static int boohiss( int c ) return c++; 0024. What is the output of the following program? public class Q59 method(3); method(2); method(1); public static void method(int n) System.out.println("Calling method " + n); Calling method 1 Calling method 1 Calling method 1 Error Message Exposure Java 2013, APCS Edition Chapter 7 Test Page 20 Updated: 10-29-13

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