JAVA ch 7, Chapter 7 Arrays and ArrayLists Q5, BP - CH 6: Arrays and ArrayLists
Invalid possibilities for ARRAY INDICES include
(-) Negative Integers
Which method call CONVERTS the value in variable stringVariable TO AN INTEGER?
Integer.parseInt( stringVariable ).
Which method call CONVERTS the value in variable stringVariable to an integer?
Integer.parseInt( stringVariable ).
Ans: b. Negative integers.
Invalid possibilities for array indices include . a. Positive integers. b. Negative integers. c. Zero. d. None of the above.
CONSTANT variables also are called .
NAMED constants
Ans: d. declare then create the array.
Q1: A programmer must do the following before using an array: a. declare then reference the array. b. create then declare the array. c. create then reference the array. d. declare then create the array.
Ans: b. fixed-length entities.
Q1: Arrays are: a. variable-length entities. b. fixed-length entities. c. data structures that contain up to 10 related data items. d. used to draw a sequence of lines, or "rays."
Ans: b. A, B, D.
Q1: Which of the following statements about arrays are true? A. An array is a group of variables containing values that all have the same type. B. Elements are located by index or subscript. C. The length of an array c is determined by the expression c.length();. D. The zeroth element of array c is specified by c[ 0 ]. a. A, C, D. b. A, B, D. c. C, D. d. A, B, C, D.
Ans: c. two nested for statements.
The preferred way to traverse a two-dimensional array is to use . a. a do while statement. b. a for statement. c. two nested for statements. d. three nested for statements.
Which of the following is false? size of an ArrayList
The size of an ArrayList can be determined via its LENGTH INSTANCE variable.
Consider the CODE SEGMENT below. Which of the following statements is FALSE? int[] g; g = new int[ 23 ];
The value of g[ 3 ] is -1
Consider integer array values, which contains 5 ELEMENTS. Which statements successfully SWAP the contents of the array at index 3 and index 4?
int temp = values[ 3 ]; values[ 3 ] = values[ 4 ]; values[ 4 ] = temp;
Which set of statements totals the values in two-dimensional INT ARRAY ITEMS?
int total = 0; for ( INT[] subItems : items ) for ( int item : SUBITEMS ) total += item;
Which set of statements TOTALS the items in EACH ROW of 2-dimensional array items, and displays each total?
int total = 0; for ( int row = 0; row < items.length; row++ ) { TOTAL = 0; for ( int column = 0; column < a[ row ].length; column++ ) total += a[ row ][ column ]; System.out.printf( "%d\n", total ); }
Which of the following initializer lists would CORRECTLY SET THE ELEMENT of array n?
int[] n = { 1, 2, 3, 4, 5 };.
Which command below RUNS TestProgram, and PASSES in the values files.txt and 3?
java TestProgram files.txt 3
Ans: d. Test harness.
What kind of application tests a class by creating an object of that class and calling the class's methods? a. Pseudo application. b. Debugger. c. Tester. d. Test harness.
Class ARRAYS methods sort, binarySearch, equals and fill are overloaded for primitive-type arrays and Object arrays. In addition, methods __________ and __________ are overloaded with GENERIC VERSIONS.
binarySearch, equals
Which method SETS the BACKGROUND color of a JPanel?
setBackground
Which statement correctly PASSES the array items to method takeArray? Array items contains 10 ELEMENTS.
takeArray( items ).
CONSIDER array items, which contains the values 0, 2, 4, 6 and 8. If method changeArray is called with the method call changeArray( items, items[ 2 ] ), what values are stored in items after the METHOD HAS FINISHED executing? public static void changeArray( int[] passedArray, int value ) { passedArray[ value ] = 12; value = 5; } // end method changeArray
0, 2, 4, 6, 12.
Which flag in a format specifier indicates that values with fewer digits than the field width should begin with a LEADING ZERO?
0.
The preferred way TO TRAVERSE a two-dimensional array is to use .
2 NESTED FOR statements.
FOR the array in the previous question, what is the VALUE RETURNED by items[ 1 ][ 0 ]?
6.
Consider the array: s[ 0 ] = 7 s[ 1 ] = 0 s[ 2 ] = -12 s[ 3 ] = 9 s[ 4 ] = 10 s[ 5 ] = 3 s[ 6 ] = 6 The value of s[ s[ 6 ] - s[ 5 ] ] is:
9
Which of the following statements about arrays are true? A. An array is a group of variables containing values that all have the same type. B. Elements are located by index or subscript. C. The length of an array c is determined by the expression c.length();. D. The zeroth element of array c is specified by c[ 0 ].
A, B, D.
Types in Java are divided into two categories. The primitive types are boolean, byte, char, short, int, long, float and double. All other types are ________ types. a. static b. reference c. declared d. source
ANS: b. reference
Which of the following statements is false? a. A reference to an object is required to invoke an object's methods. b. A primitive-type variable does not refer to an object. c. Reference-type instance variables are initialized by default to the value void. d. A primitive-type variable cannot be used to invoke a method.
ANS: c. Reference-type instance variables are initialized by default to the value void. Actually, Reference-type instance variables are initialized by default to the value null.
Reference-type variables (called references) store ________ in memory. a. the value of an object b. a copy of an object c. the location of an object d. the size of an object
ANS: c. the location of an object
Which of the following statements is false? a. A primitive-type variable can store exactly one value of its declared type at a time. b. Primitive-type instance variables are initialized by default. c. Variables of types byte, char, short, int, long, float and double are initialized to 0. d. Variables of type boolean are initialized to true.
ANS: d. Variables of type boolean are initialized to true. Actually, variables of type boolean are initialized to false.
In array items, which expression below ACCESSES the value at ROW 3 and COLUMN 4?
All of the above
In Java, MULTIDIMENSIONAL arrays:
All of the above.
Ans: b. ellipsis (...).
An argument type followed by a(n) in a method's parameter list indicates that the method receives a variable number of arguments of that particular type. a. square brackets ([]). b. ellipsis (...). c. varargs keyword. d. All of the above are acceptable to indicate a variable number of arguments.
Ans: c. B and D.
An array with m rows and n columns is not: A. An m-by-n array. B. An n-by-m array. C. A two-dimensional array. D. A dual-transcripted array. a. A and C. b. A and D. c. B and D. d. B and C.
Arrays 6.3 Q1: Which of the following statements about arrays are true? A. An array is a group of variables containing values that all have the same type. B. Elements are located by index. C. The length of an array c is determined by the expression c.length();. D. The zeroth element of array c is specified by c[0]. a. A, C, D. b. A, B, D. c. C, D. d. A, B, C, D.
Ans: b. A, B, D.
Arrays are ________. a. variable-length entities b. fixed-length entities c. data structures that contain up to 10 related data items d. used to draw a sequence of lines, or "rays"
Ans: b. fixed-length entities.
Consider the array: s[0] = 7 s[1] = 0 s[2] = -12 s[3] = 9 s[4] = 10 s[5] = 3 s[6] = 6 The value of s[s[6] - s[5]] is: a. 0. b. 3. c. 9. d. 0.
Ans: c. 9.
An array with "m" rows and "n" columns is not: A. An m-by-n array. B. An n-by-m array. C. A two-dimensional array. D. A dual-transcripted array.
Ans: c. B and D.
Declaring and Creating Arrays A programmer must do the following before using an array: a. declare then reference the array. b. create then declare the array. c. create then reference the array. d. declare then create the array.
Ans: d. declare then create the array.
Attempting to ACCESS an ARRAY element out of the BOUNDS of an array, causes a(n) .
ArrayIndexOutOfBoundsException.
Class ________ represents a dynamically RESIZABLE array-like data structure.
ArrayList
Ans: c. for ( int i : items ) System.out.prinf( "%d\n", i );
Assume array items contains the integer values 0, 2, 4, 6 and 8. Which of the following set of statements uses the enhanced for loop to display each value in array items? a. for ( int i = 0; i < items.length; i++ ) System.out.prinf( "%d\n", items[ i ] ); b. for ( int i : items ) System.out.prinf( "%d\n", items[ i ] ); c. for ( int i : items ) System.out.prinf( "%d\n", i ); d. for ( int i = 0 : items.length ) System.out.prinf( "%d\n", items[ i ] );
Ans: c. ArrayIndexOutOfBoundsException.
Attempting to access an array element out of the bounds of an array, causes a(n) . a. ArrayOutOfBoundsException. b. ArrayElementOutOfBoundsException. c. ArrayIndexOutOfBoundsException. d. ArrayException.
In this question, assume a CLASS, BOOK, has been defined. Which set of statements creates an array of Book objects?
Book[] books; books = new Book[ numberElements ];
Which of the following will not produce a COMPILER error?
Changing the value at a GIVEN INDEX of an array after it is created
ANS: c. binarySearch, equals.
Class Arrays methods sort, binarySearch, equals and fill are overloaded for primitive-type arrays and Object arrays. In addition, methods __________ and __________ are overloaded with generic versions. a. a. sort, binarySearch. b. b. sort, fill. c. c. binarySearch, equals. d. d. binarySearch, fill.
ANS: d. equals.
Class Arrays provides method __________ for comparing arrays. a. a. compare. b. b. compares. c. c. equal. d. d. equals.
ANS: b. ArrayList.
Class ________ represents a dynamically resizable array-like data structure. a. a. Array. b. b. ArrayList. c. c. Arrays. d. d. None of the above.
Ans: d. 0, 2, 4, 6, 12.
Consider array items, which contains the values 0, 2, 4, 6 and 8. If method changeArray is called with the method call changeArray( items, items[ 2 ] ), what values are stored in items after the method has finished executing? public static void changeArray( int[] passedArray, int value ) { passedArray[ value ] = 12; value = 5; } // end method changeArray a. 0, 2, 5, 6, 12. b. 0, 2, 12, 6, 8. c. 0, 2, 4, 6, 5. d. 0, 2, 4, 6, 12.
Ans: c. int temp = values[ 3 ]; values[ 3 ] = values[ 4 ]; values[ 4 ] = temp;
Consider integer array values, which contains 5 elements. Which statements successfully swap the contents of the array at index 3 and index 4? a. values[ 3 ] = values[ 4 ]; values[ 4 ] = values[ 3 ]; b. values[ 4 ] = values[ 3 ]; values[ 3 ] = values[ 4 ]; c. int temp = values[ 3 ]; values[ 3 ] = values[ 4 ]; values[ 4 ] = temp; d. int temp = values[ 3 ]; values[ 3 ] = values[ 4 ]; values[ 4 ] = values[ 3 ];
Ans: c. Result is: 286.
Consider the class below: public class Test { public static void main( String[] args ) { int[] a = { 99, 22, 11, 3, 11, 55, 44, 88, 2, -3 }; int result = 0; for ( int i = 0; i < a.length; i++ ) { if ( a[ i ] > 30 ) result += a[ i ]; } // end for System.out.printf( "Result is: %d\n", result ); } // end main } // end class Test The output of this Java program will be: a. Result is: 280. b. Result is: 154. c. Result is: 286. d. Result is: 332.
Ans: c. Result is: 65.
Consider the program below: public class Test { public static void main( String[] args ) { int[] a; a = new int[ 10 ]; for ( int i = 0; i < a.length; i++ ) a[ i ] = i + 2; int result = 0; for ( int i = 0; i < a.length; i++ ) result += a[ i ]; System.out.printf( "Result is: %d\n", result ); } // end main } // end class Test The output of this program will be: a. Result is: 62. b. Result is: 64. c. Result is: 65. d. Result is: 67.
What do the following statements do? double[] array; array = new double[ 14 ];
Create a double array containing 14 ELEMENTS
A PROGRAMMER must do the following BEFORE USING an array:
DECLARE then CREATE the array
Class Arrays provides method __________ for COMPARING arrays.
EQUALS
Arrays are:
Fixed-Length EntitieS
Ans: d. 6.
For the array in the previous question, what is the value returned by items[ 1 ][ 0 ]? a. 4. b. 8. c. 12. d. 6.
Which of the following tasks CANNOT be performed using an ENHANCED FOR LOOP?
INCREMENTING the value stored in each element of the array.
Which set of statements totals the items in each row of two-dimensional array items, and DISPLAYS each TOTAL?
INT total = 0; for ( int row = 0; row < items.length; row++ ) { total = 0; for ( int column = 0; column < a[ row ].length; column++ ) total += a[ row ][ column ]; System.out.printf( "%d\n", total ); }
Ans: d. All of the above.
In Java, multidimensional arrays: a. are not directly supported. b. are implemented as arrays of arrays. c. are often used to represent tables of values. d. All of the above.
Ans: d. All of the above.
In array items, which expression below accesses the value at row 3 and column 4? a. items[ 3 ].[ 4 ]. b. items[ 3[ 4 ] ]. c. items[ 3 ][ 4 ]. d. items[ 3, 4 ].
Ans: a. Book[] books; books = new Book[ numberElements ];
In this question, assume a class, Book, has been defined. Which set of statements creates an array of Book objects? a. Book[] books; books = new Book[ numberElements ]; b. Book[] books]; books = new Book()[ numberElements ]; c. new Book() books[]; books = new Book[ numberElements ]; d. All of the above.
Ans: c. The elements of an array of integers have a value of null before they are initialized.
Q1: Which of the following statements about creating arrays and initializing their elements is false? a. The new keyword should be used to create an array. b. When an array is created, the number of elements must be placed in square brackets following the type of element being stored. c. The elements of an array of integers have a value of null before they are initialized. d. A for loop is commonly used to set the values of the elements of an array.
Ans: c. 9.
Q2: Consider the array: s[ 0 ] = 7 s[ 1 ] = 0 s[ 2 ] = -12 s[ 3 ] = 9 s[ 4 ] = 10 s[ 5 ] = 3 s[ 6 ] = 6 The value of s[ s[ 6 ] - s[ 5 ] ] is: a. 0. b. 3. c. 9. d. 0.
Ans: d. The value of g[ 3 ] is -1.
Q2: Consider the code segment below. Which of the following statements is false? int[] g; g = new int[ 23 ]; a. The first statement declares an array reference. b. The second statement creates the array. c. g is a reference to an array of integers. d. The value of g[ 3 ] is -1.
Ans: b. Create a double array containing 14 elements.
Q2: What do the following statements do? double[] array; array = new double[ 14 ]; a. Create a double array containing 13 elements. b. Create a double array containing 14 elements. c. Create a double array containing 15 elements. d. Declare but do not create a double array.
Ans: a. int[] n = { 1, 2, 3, 4, 5 };.
Q3: Which of the following initializer lists would correctly set the elements of array n? a. int[] n = { 1, 2, 3, 4, 5 };. b. array n[ int ] = { 1, 2, 3, 4, 5 };. c. int n[ 5 ] = { 1; 2; 3; 4; 5 };. d. int n = new int( 1, 2, 3, 4, 5 );.
Ans: c. named constants.
Q4: Constant variables also are called . a. write-only variables. b. finals. c. named constants. d. All of the above.
Consider the class below: public class Test { public static void main( String[] args ) { int[] a = { 99, 22, 11, 3, 11, 55, 44, 88, 2, -3 }; int result = 0; for ( int i = 0; i < a.length; i++ ) { if ( a[ i ] > 30 ) result += a[ i ]; } // end for System.out.printf( "Result is: %d\n", result ); } // end main } // end class Test
Result is: 286
Consider the program below: public class Test { public static void main( String[] args ) { int[] a; a = new int[ 10 ]; for ( int i = 0; i < a.length; i++ ) a[ i ] = i + 2; int result = 0; for ( int i = 0; i < a.length; i++ ) result += a[ i ]; System.out.printf( "Result is: %d\n", result ); } // end main } // end class Test The output of this program will be:
Result is: 65
When an argument is PASSED by REFERENCE:
THE CALLED METHOD can access the argument's value in the caller directly and modify that data.
WHAT KIND of application tests a class by CREATING an object of that class and calling the class's methods?
TeST HARNESS
Which of the following statements is false? EXCEPTION HANDLING
The CATCH block contains the code that might THROW an EXCEPTION, and the try block contains the code that handles the exception if one occurs.
Which of the following statements about CREATING arrays and INITIALIZING their elements is FALSE?
The elements of an array of INTEGERS have a VALUE OF NULL before they are initialized
Which of the following statements about an ARC is false?
The fillArc method DRAWS AN OVAL, with the section that is an arc filled in.
Ans: c. the called method can access the argument's value in the caller directly and modify that data.
When an argument is passed by reference: a. a copy of the argument's value is passed to the called method. b. changes to the argument do not affect the original variable's value in the caller. c. the called method can access the argument's value in the caller directly and modify that data. d. the original value is removed from memory.
Ans: a. java TestProgram files.txt 3.
Which command below runs TestProgram, and passes in the values files.txt and 3? a. java TestProgram files.txt 3. b. java TestProgram files.txt, 3. c. java TestProgram "files.txt", "3". d. java TestProgram (the arguments files.txt and 3 were passed in when the application was compiled).
Ans: a. ++arrayName[ i ].
Which expression adds 1 to the element of array arrayName at index i? a. ++arrayName[ i ]. b. arrayName++[ i ]. c. arrayName[ i++ ]. d. None of the above.
Ans: d. 0.
Which flag in a format specifier indicates that values with fewer digits than the field width should begin with a leading 0? a. p. b. l. c. w. d. 0.
Ans: c. Integer.parseInt( stringVariable ).
Which method call converts the value in variable stringVariable to an integer? a. Convert.toInt( stringVariable ). b. Convert.parseInt( stringVariable ). c. Integer.parseInt( stringVariable ). d. Integer.toInt( stringVariable ).
Ans: b.
Which method sets the background color of a JPanel? a. setBack. b. setBackground. c. setBackgroundColor. d. setColor.
Ans: a.
Which of the following is false? a. The size of an ArrayList can be determined via its length instance variable. b. The size of an ArrayList can be determined via its size method. c. You can add a new item to the end of an ArrayList with its add method. c. You can get an item from a specified index in an ArrayList with its get method.
Ans: b. int[][] items; items = new int[ 3 ][ ]; items[ 0 ] = new int[ 1 ]; items[ 1 ] = new int[ 4 ]; items[ 2 ] = new int[ 2 ];
Which of the following sets of statements creates a multidimensional array with 3 rows, where the first row contains 1 value, the second row contains 4 items and the final row contains 2 items? a. int[][] items; items = new int[ 3 ][ ? ]; items[ 0 ] = new int[ 1 ]; items[ 1 ] = new int[ 4 ]; items[ 2 ] = new int[ 2 ]; b. int[][] items; items = new int[ 3 ][ ]; items[ 0 ] = new int[ 1 ]; items[ 1 ] = new int[ 4 ]; items[ 2 ] = new int[ 2 ]; c. int[][] items; items = new int[ ? ][ ? ]; items[ 0 ] = new int[ 1 ]; items[ 1 ] = new int[ 4 ]; items[ 2 ] = new int[ 2 ]; d. int[][] items; items[ 0 ] = new int[ 1 ]; items[ 1 ] = new int[ 4 ]; items[ 2 ] = new int[ 2 ];
Ans: d. The fillArc method draws an oval, with the section that is an arc filled in.
Which of the following statements about an arc is false? a. An arc is a section of an oval. b. The sweep is the amount of arc to cover. c. Method drawArc draws the edges of an arc. d. The fillArc method draws an oval, with the section that is an arc filled in.
Ans: b. int[][] items = { { 1 }, { 2, 3, 4, 5 }, { 6, 7 } };.
Which of the following statements creates a multidimensional array with 3 rows, where the first row contains 1 element, the second row contains 4 elements and the final row contains 2 elements? a. int[][] items = { { 1, null, null, null }, { 2, 3, 4, 5 }, { 6, 7, null, null } };. b. int[][] items = { { 1 }, { 2, 3, 4, 5 }, { 6, 7 } };. c. int[][] items = { { 1 }, { 2, 3, 4, 5 }, { 6, 7 }, {} );. d. int[][] items = { { 1 }, { 4 }, { 2 } };.
Ans: c. The catch block contains the code that might throw an exception, and the try block contains the code that handles the exception if one occurs.
Which of the following statements is false? a. An exception indicates a problem that occurs while a program executes. b. Exception handling enables you to create fault-tolerant programs that can resolve (or handle) exceptions—in many cases, this allows a program to continue executing as if no problems were encountered. c. The catch block contains the code that might throw an exception, and the try block contains the code that handles the exception if one occurs. d. Inside the catch block, you can use the parameter's identifier to interact with a caught exception object.
Ans: d. Incrementing the value stored in each element of the array.
Which of the following tasks cannot be performed using an enhanced for loop? a. Calculating the product of all the values in an array. b. Displaying all even element values in an array. c. Comparing the elements in an array to a specific value. d. Incrementing the value stored in each element of the array.
Ans: b. Changing the value at a given index of an array after it is created.
Which of the following will not produce a compiler error? a. Changing the value of a constant after it is declared. b. Changing the value at a given index of an array after it is created. c. Using a final variable before it is initialized. d. All of the above will produce compiler errors.
Ans: a. int total = 0; for ( int row = 0; row < items.length; row++ ) { total = 0; for ( int column = 0; column < a[ row ].length; column++ ) total += a[ row ][ column ]; System.out.printf( "%d\n", total ); }
Which set of statements totals the items in each row of two-dimensional array items, and displays each total? a. int total = 0; for ( int row = 0; row < items.length; row++ ) { total = 0; for ( int column = 0; column < a[ row ].length; column++ ) total += a[ row ][ column ]; System.out.printf( "%d\n", total ); } b. int total = 0; for ( int row = 0; row < items.length; row++ ) { for ( int column = 0; column < a[ row ].length; column++ ) total += a[ row ][ column ]; System.out.printf( "%d\n", total ); } c. int total = 0; for ( int row = 0; row < items.length; row++ ) { for ( int column = 0; column < a[ column ].length; column++ ) total += a[ row ][ column ]; System.out.printf( "%d\n", total ); } d. int total = 0; for ( int row = 0; row < items.length; row++ ) { total = 0; for ( int column = 0; column < a[ column ].length; column++ ) total += a[ row ][ column ]; System.out.printf( "%d\n", total ); }
Ans: d. int total = 0; for ( int[] subItems : items ) for ( int item : subItems ) total += item;
Which set of statements totals the values in two-dimensional int array items? a. int total = 0; for ( int subItems : items ) for ( int item : subItems ) total += item; b. int total = 0; for ( int item: int[] subItems : items ) total += item; c. int total = 0; for ( int[] subItems : items ) for ( int item : items ) total += item; d. int total = 0; for ( int[] subItems : items ) for ( int item : subItems ) total += item;
Ans: a. int[][] items = { { 2, 4 }, { 6, 8 }, { 10, 12 } };.
Which statement below initializes array items to contain 3 rows and 2 columns? a. int[][] items = { { 2, 4 }, { 6, 8 }, { 10, 12 } };. b. int[][] items = { { 2, 6, 10 }, { 4, 8, 12 } };. c. int[][] items = { 2, 4 }, { 6, 8 }, { 10, 12 };. d. int[][] items = { 2, 6, 10 }, { 4, 8, 12 };.
Ans: b. takeArray( items ).
Which statement correctly passes the array items to method takeArray? Array items contains 10 elements. a. takeArray( items[] ). b. takeArray( items ). c. takeArray( items[ 9 ] ). d. Arrays cannot be passed to methods—each item must be sent to the method separately.
Which expression ADDS 1 to the ELEMENT of array arrayName at index i?
a. ++arrayName[ i ].
Which of the following statements creates a multidimensional ARRAY with 3 rows, where the FIRST row contains 1 element, the SECOND row contains 4 elements and the final row contains 2 elements?
b. int[][] items = { { 1 }, { 2, 3, 4, 5 }, { 6, 7 } };.
An ARGUMENT type followed by a(n) in a method's parameter list indicates that the method receives a variable number of arguments of that PARTICULAR TYPE
ellipsis (...).
Assume array items contains the integer values 0, 2, 4, 6 and 8. Which of the following set of statements uses the ENHANCED FOR LOOP to display each value in array items?
for ( int i : items ) System.out.prinf( "%d\n", i );
Which statement below INITIALIZES array items to contain "3" rows and "2" columns? a. b. int[][] items = { { 2, 6, 10 }, { 4, 8, 12 } };. c. int[][] items = { 2, 4 }, { 6, 8 }, { 10, 12 };. d. int[][] items = { 2, 6, 10 }, { 4, 8, 12 };. Ans: a. int[][] items = { { 2, 4 }, { 6, 8 }, { 10, 12 } };.
int[][] items = { { 2, 4 }, { 6, 8 }, { 10, 12 } };.
WHICH of the FOLLOWING SETS of statements creates a multidimensional array with 3 rows, where the first row contains 1 value, the second row contains 4 items and the final row contains 2 items?
int[][] items; items = new int[ 3 ][ ]; items[ 0 ] = new int[ 1 ]; items[ 1 ] = new int[ 4 ]; items[ 2 ] = new int[ 2 ];
Which command below runs TestProgram, and passes in the values files.txt and 3?
java TestProgram files.txt 3.
