please provide the answers for questions about java. 1. The question is about us

Question

please provide the answers for questions about java.

1. The question is about using File class from the Java library. Create a File object fot the file data.txt in the working directory.

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2. This question is about using the File class from the Java library. A File object named dataFile has been created in a program for a file. Write the code that will print out the size of the file along with a suitable message.

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3. This question is about using the File class form the Java library. A File object named commerce has been created in a program for either a file or directory. Whatever it is, it does exist. Write the code that will pritn out a suitable message that states whether commerce is a regular file or a directory.

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4. This question is about using the FIle class from the Java library. A File object named scores.odt has been created in a program for a file that might exist. Write the code that will print out a suitable message that staes whether scores.odt exists or not.

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5. You are to write some code that is part of a larger program. Write the code that will write the message " the radius of the earth is 1" to a file named message.txt in the current working directory of the program.

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6.You are to write some code that is part of a larger program. In the current working directory of the program is a file named data.txt with the following content:

Write the code that will read the two numbers from the file, add them together and display the sum with a suitable message.

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7. Write a method with the following header:

public int slowAdd ( int x, int y)

This method works as follows:

1.If y is 0, then return x

2.Otherwise, call slowAdd with the parameters x and y-1, add one to the result and return the sum.

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8. Write a method with the following header:

public int gcd(int x, int y)

This method works as follows:

1. If y is 0, then return x

2. Otherwise, call slowAdd with the first parameter equal to y and the second parameter equal to x%y. Return the result.

Note: this is actually a reasonable implementation of the greatest common divisor function.

Explanation / Answer

1. The question is about using File class from the Java library. Create a File object fot the file data.txt in the working directory.
File dataFile = new File("data.txt");

2. This question is about using the File class from the Java library. A File object named dataFile has been created in a program for a file. Write the code that will print out the size of the file along with a suitable message.
System.out.println("Size of data file is "+dataFile.length());

3. This question is about using the File class form the Java library. A File object named commerce has been created in a program for either a file or directory. Whatever it is, it does exist. Write the code that will pritn out a suitable message that states whether commerce is a regular file or a directory.

if(commerce.isDirectory())
System.out.println("commerce is Directory");
else if(commerce.isFile())
System.out.println("commerce is File");

4. This question is about using the FIle class from the Java library. A File object named scores.odt has been created in a program for a file that might exist. Write the code that will print out a suitable message that staes whether scores.odt exists or not.
if(scores.odt.exists())
System.out.println("scores.odt exists");
else
System.out.println("scores.odt does not exist");
5. You are to write some code that is part of a larger program. Write the code that will write the message " the radius of the earth is 1" to a file named message.txt in the current working directory of the program.

PrintWriter pr = new PrintWriter(new File("message.txt"));
pr.println(" the radius of the earth is 1");
pr.close();

6.You are to write some code that is part of a larger program. In the current working directory of the program is a file named data.txt with the following content:
35 46 Write the code that will read the two numbers from the file, add them together and display the sum with a suitable message.

Scanner in = new Scanner(new File("data.txt"));
int a = in.nextInt();
int b = in.nextInt();
System.out.println("Integers read from file is " + a + " and " + b);

7. Write a method with the following header:
public int slowAdd ( int x, int y)
This method works as follows:
1.If y is 0, then return x
2.Otherwise, call slowAdd with the parameters x and y-1, add one to the result and return the sum.

public int slowAdd ( int x, int y){
   if(y==0) return x;
   else return 1+slowAdd(x,y-1);
}

8. Write a method with the following header:
public int gcd(int x, int y)
This method works as follows:
1. If y is 0, then return x
2. Otherwise, call slowAdd with the first parameter equal to y and the second parameter equal to x%y. Return the result.
Note: this is actually a reasonable implementation of the greatest common divisor function.

public int gcd(int x, int y){
   if(y==0) return x;
   else slowAdd (y,x%y);
}

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