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3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14.
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int [] [] [] x = new int [3] [] []; int i,j; x[0] = new int[4][]; x[1] = new int[2][]; x[2] = new int[5][]; for (i=0; i<x.length; i++) for (j=0; j<x[i].length; j++) { x[i][j] = new int [i + j + 1]; System.out.println("size = " + x[i][j].length); } } }
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how many lines of output will be produced (Choose one.)
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A. 7 B. 9 C. 11 D. 13 E. Compilation fails F.
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An exception is thrown at runtime
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12. Given the following,
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1. 2. 3. 4. 5. 6. 7. 8. 9. public class Test { public static void main(String [] args) { byte [][] big = new byte [7][7]; byte [][] b = new byte [2][1]; byte b3 = 5; byte b2 [][][][] = new byte [2][3][1][2]; } }
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which of the following lines of code could be inserted at line 7, and still allow the code to compile (Choose four that would work.)
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A. b2[0][1] = b; B. b[0][0] = b3; C. b2[1][1][0] = b[0][0]; D. b2[1][2][0] = b; E. b2[0][1][0][0] = b[0][0]; F.
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b2[0][1] = big;
1: Language Fundamentals
13. Which two will declare an array and initialize it with five numbers (Choose two.) A. Array a = new Array(5); B. int [] a = {23,22,21,20,19}; C. int [] array; D. int array [] = new int [5]; E. int a [] = new int(5); F.
int [5] array;
14. Which will legally declare, construct, and initialize an array (Choose one.) A. int [] myList = { 1 , 2 , 3 }; B. int [] myList = (5, 8, 2); C. int myList [] [] = {4,9,7,0}; D. int myList [] = {4, 3, 7}; E. int [] myList = [3, 5, 6]; F.
int myList [] = {4; 6; 5};
Using a Variable or Array Element That Is Uninitialized and Unassigned (Objective 4.5)
15. Which four describe the correct default values for array elements of the types indicated (Choose four.) A. int B. String C. Dog D. char E. float F.
-> 0 -> null -> \u0000 -> 0.0f -> null
boolean -> true
16. Given the following,
1. 2. 3. 4. 5. 6. public class TestDogs { public static void main(String [] args) { Dog [][] theDogs = new Dog[3][]; System.out.println(theDogs[2][0].toString()); } }
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7. 8.
class Dog {}
what is the result (Choose one.)
A. null B. theDogs C. Compilation fails D. An exception is thrown at runtime 17. Given the following,
1. 2. 3. 4. 5. 6. 7. 8. public class X { public static void main(String [] args) { String names [] = new String[5]; for (int x=0; x < args.length; x++) names[x] = args[x]; System.out.println(names[2]); } }
and the command line invocation is
java X a b
what is the result (Choose one.)
A. names B. null C. Compilation fails D. An exception is thrown at runtime
Command-Line Arguments to Main (Objective 4.3)
18. Given the following,
1. 2. 3. 4. 5. 6. 7. 8. 9. public class CommandArgs { public static void main(String [] args) { String s1 = args[1]; String s2 = args[2]; String s3 = args[3]; String s4 = args[4]; System.out.print(" args[2] = " + s2); } }
1: Language Fundamentals
and the command-line invocation,
java CommandArgs 1 2 3 4
what is the result
A. args[2] = 2 B. args[2] = 3 C. args[2] = null D. args[2] = 1 E. Compilation fails F.
An exception is thrown at runtime
19. Given the following,
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. public class CommandArgsTwo { public static void main(String [] argh) { String [] args; int x; x = argh.length; for (int y = 1; y <= x; y++) { System.out.print(" " + argh[y]); } } }
and the command-line invocation,
java CommandArgsTwo 1 2 3
what is the result
A. 0 1 2 B. 1 2 3 C. 0 0 0 D. null null null E. Compilation fails F.
An exception is thrown at runtime
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20. Given the following,
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. public class CommandArgsThree { public static void main(String [] args) { String [][] argCopy = new String[2][2]; int x; argCopy[0] = args; x = argCopy[0].length; for (int y = 0; y < x; y++) { System.out.print(" " + argCopy[0][y]); } } }
and the command-line invocation,
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