Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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JAVA

1. Given the following import statements: import java.util.Scanner; import java.util.InputMismatchException; import java.io.File; import java.io.PrintWriter; import java.io.IOException; A. В. С. D. Е. F. All of the above. Which ones will be needed for file input/output? 2. Choose from below the instance field declarations associated with file processing. А. private String fileName; В. private double testScore; с. private PrintWriter outputFile; D. В only. Е. Both A and C. F. А, в, С. Enter a letter for the answer: 3. Code a createFile method that handles input/output exceptions through its header. public void createFile sert throws clause for handing an IO (input/output) exception. { System.out.printf("%nEnter the file name for test scores + " (WARNING: This will erase a pre-existing file!): ") ; fileName = input.nextLine (); //Complete creating outputFile a PrintWriter object for opening a file. }//END setFileName () : final void
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Transcribed Image Text:1. Given the following import statements: import java.util.Scanner; import java.util.InputMismatchException; import java.io.File; import java.io.PrintWriter; import java.io.IOException; A. В. С. D. Е. F. All of the above. Which ones will be needed for file input/output? 2. Choose from below the instance field declarations associated with file processing. А. private String fileName; В. private double testScore; с. private PrintWriter outputFile; D. В only. Е. Both A and C. F. А, в, С. Enter a letter for the answer: 3. Code a createFile method that handles input/output exceptions through its header. public void createFile sert throws clause for handing an IO (input/output) exception. { System.out.printf("%nEnter the file name for test scores + " (WARNING: This will erase a pre-existing file!): ") ; fileName = input.nextLine (); //Complete creating outputFile a PrintWriter object for opening a file. }//END setFileName () : final void
Code a setInteger method that will handle an exception, allow the user to re-input an integer, and write the integer value to a filе. 4. public void setInteger () { //Declare cont as a boolean. do { cont = false; //Beginning of block that attempts code that might throw exceptions. { System.out.printf("%nEnter an integer: ") ; //Read into anInteger that has already been declared. }//END block //Beginning of block that handles an input mismatch object called e. { input.nextLine () ; //Clear buffer. //Print "Invalid entry, try again!" //Set cont so loop re-enters when there's an exception. }//END block }while ( ); //Insert what is tested. •printf ("%d ", anInteger) ; //Write integer value to the outputFile. }//END setInteger () : void 5. //Code Java statement that releases outputFile to avoid resource-leaks.
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Transcribed Image Text:Code a setInteger method that will handle an exception, allow the user to re-input an integer, and write the integer value to a filе. 4. public void setInteger () { //Declare cont as a boolean. do { cont = false; //Beginning of block that attempts code that might throw exceptions. { System.out.printf("%nEnter an integer: ") ; //Read into anInteger that has already been declared. }//END block //Beginning of block that handles an input mismatch object called e. { input.nextLine () ; //Clear buffer. //Print "Invalid entry, try again!" //Set cont so loop re-enters when there's an exception. }//END block }while ( ); //Insert what is tested. •printf ("%d ", anInteger) ; //Write integer value to the outputFile. }//END setInteger () : void 5. //Code Java statement that releases outputFile to avoid resource-leaks.
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