Introduction to Java Programming and Data Structures: Brief Version (11th Global Edition)
11th Edition
ISBN: 9780134671710
Author: Y. Daniel Liang
Publisher: PEARSON
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Textbook Question
Chapter 17.7, Problem 17.7.3CP
What happens if the file test.dat does not exist when you attempt to compile and run the following code?
import java.io.*;
public class Test {
public static void main(String[] args) {
try ( RandomAccessFile raf =
new RandomAccessFile(“test.dat”, “r”); ) {
int i = raf.readInt();
}
catch (IOException ex) {
System.out.println(“IO exception”);
}
}
}
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Find output.
//filename: Test.java
class Test{
int x = 10;
public static void main(String[] args) {
Test t = new Test();
System.out.println(t.x);
}
}
I have the following code:
import java.util.*;
import java.io.*;
public class GradeBook {
publicstaticvoidmain(String[] args)throwsIOException{
// TODO Auto-generated method stub
File infile =newFile("students.dat");
Scanner in =newScanner(infile);
while(in.hasNext()){
// Read information form file and create a student object and print
String name = in.nextLine();
Student student =newStudent(name, in.nextLine());
for(int i =1; i <=4;++i){
student.setQuiz(i, in.nextInt());
}
student.setMidtrmExm(in.nextInt());
student.setFinalExm(in.nextInt());
in.nextLine();
// Calculate grade and letter grade;
double overallQuizScore=0.0,score=0.0;
for(int i=1;i<=student.NUM_QUIZZES;i++)
{
overallQuizScore+=(student.getQuiz(i)/student.QUIZ_MAX_POINTS)*100;
}
overallQuizScore = (overallQuizScore/4)*0.30;
score =…
1.public class Test{
public static void main(String args[]){
Person p = null;
try{
}
p.talk();
} catch (NullPointerException e) {
System.out.print("There is a NullPointerException.");
}
catch(Exception e) {
System.out.print("There is an Exception.");
}
System.out.print("Everything went fine.");
}
what will be the result if you run this program?
O There is a NullPointerException. Everything went fine.
O There is a NullPointerException.
There is a NullPointerException. There is an Exception.
This code will not compile, because in Java there are no pointers.
Chapter 17 Solutions
Introduction to Java Programming and Data Structures: Brief Version (11th Global Edition)
Ch. 17.2 - What is a text file and what is a binary file? Can...Ch. 17.2 - How do you read or write text data in Java? What...Ch. 17.3 - Prob. 17.3.1CPCh. 17.3 - How is a Java character represented in the memory,...Ch. 17.3 - If you write the string ABC to an ASCII text file,...Ch. 17.3 - If you write the string 100 to an ASCII text file,...Ch. 17.3 - What is the encoding scheme for representing a...Ch. 17.4 - Prob. 17.4.1CPCh. 17.4 - Why should you always close streams? How do you...Ch. 17.4 - Prob. 17.4.3CP
Ch. 17.4 - Does FileInputStream/Fi1eOutputStream introduce...Ch. 17.4 - What will happen if you attempt to create an input...Ch. 17.4 - How do you append data to an existing text file...Ch. 17.4 - Prob. 17.4.7CPCh. 17.4 - What is written to a file using writeByte(91) on a...Ch. 17.4 - How do you check the end of a file in an input...Ch. 17.4 - What is wrong in the following code? Import...Ch. 17.4 - Suppose you run the following program on Windows...Ch. 17.4 - After the following program is finished, how many...Ch. 17.4 - For each of the following statements on a...Ch. 17.4 - What are the advantages of using buffered streams?...Ch. 17.5 - How does the program check if a file already...Ch. 17.5 - How does the program detect the end of the file...Ch. 17.5 - How does the program count the number of bytes...Ch. 17.6 - Prob. 17.6.1CPCh. 17.6 - Prob. 17.6.2CPCh. 17.6 - Is it true that any instance of...Ch. 17.6 - Prob. 17.6.4CPCh. 17.6 - Prob. 17.6.5CPCh. 17.6 - What will happen when you attempt to run the...Ch. 17.7 - Can RandomAccessFi1e streams read and write a data...Ch. 17.7 - Create a RandomAccessFi1e stream for the file...Ch. 17.7 - What happens if the file test.dat does not exist...Ch. 17 - (Create a text file) Write a program to create a...Ch. 17 - (Create a binary data file) Write a program to...Ch. 17 - (Sum all the integers in a binary data file)...Ch. 17 - (Convert a text file into UTF) Write a program...Ch. 17 - Prob. 17.5PECh. 17 - Prob. 17.6PECh. 17 - Prob. 17.7PECh. 17 - (Update count) Suppose that you wish to track how...Ch. 17 - (Address book) Write a program that stores,...Ch. 17 - (Split files) Suppose you want to back up a huge...Ch. 17 - (Split files GUI) Rewrite Exercise 17.10 with a...Ch. 17 - Prob. 17.12PECh. 17 - (Combine files GUI) Rewrite Exercise 17.12 with a...Ch. 17 - (Encrypt files) Encode the file by adding 5 to...Ch. 17 - (Decrypt files) Suppose a file is encrypted using...Ch. 17 - (Frequency of characters) Write a program that...Ch. 17 - (BitOutputStream) Implement a class named...Ch. 17 - (View bits) Write the following method that...Ch. 17 - (View hex) Write a program that prompts the user...Ch. 17 - (Hex editor) Write a GUI application that lets the...
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