Develop Reference

Printing an Arraylist in toString with new lines separating each entry

I have a toString that needs to print a lot of stuff, including an Arraylist which contains multiple entries. Those entries have to be separated by a new line. Here is the toString code that I am working with right now:
#Override
public String toString() // Displays the info for a class
{
return getCourseId() + "\n" + getCourseName() + "\n" + getCourseCode()
+ "\n" + "\n" + "Instructor" + "\n" + "-------------------------"
+ "\n" + Instructor.toString() + "\n" + "\n" + "Student Roster"
+ "\n" + "-------------------------" + "\n" + roster;
}
The roster does print, but all of the entries exist on the same line with brackets and commas.
My instructor insists that the toString be self-contained, so everything that I have in the toString currently has to stay there.
The roster prints like this:
#Override
public String toString() // Displays the info for a person in order
{
return getPersonId() + "\t" + getLastName() + "\t" + getFirstName()
+ "\t" + getMajor() + "\t" + getGpa();
}
Currently, I get the output that looks like this:
10000
College Algebra
MATH 101
Instructor
-------------------------
X00009876 Jones Jane Associate Professor Mathematics
Student Roster
-------------------------
[X00000002 Smith Sally History 2.98, X00000003 Adams Amanda Civil Engineering 3.7, X00000005 Turner Thomas Nursing 2.34]
But I would like it to look like this:
10000
College Algebra
MATH 101
Instructor
-------------------------
X00009876 Jones Jane Associate Professor Mathematics
Student Roster
-------------------------
X00000002 Smith Sally History 2.98
X00000003 Adams Amanda Civil Engineering 3.7
X00000005 Turner Thomas Nursing 2.34
Any suggestions would be greatly appreciated. Thanks!

Either use
roster.stream().collect(Collectors.joining("\n"))
or
String.join("\n", roster)

Use this code for roster:
... + roster.stream().collect(Collectors.joining("\n"))

So, I figured out my problem. I had to remove the return statement and put it at the end so I could put a for-each loop and print my Arraylist. Here's what the final code looked like:
#Override
public String toString() // Displays the info for a class
{
System.out.print(getCourseId() + "\n" + getCourseName() + "\n" + getCourseCode()
+ "\n" + "\n" + "Instructor" + "\n" + "-------------------------"
+ "\n" + Instructor.toString() + "\n" + "\n" + "Student Roster"
+ "\n" + "-------------------------" + "\n");
roster.stream().forEach((tmp) -> { // for each student, put
System.out.println(tmp); // them on a new line
});
return "";
}

Creating a string with operator

Generate by use of the operator + a string, that the values in the variable in the given ones on top
Order includes, in each case apart by ",". give the string with System out println (...).

Remove the quotes " and call toString()
str = hexValue.toString() + ", " + octValue.toString() + ", " + l.toString() + ", " + var1.toString() + ", " + var2.toString() + ", " + var3.toString() + ", " + var4.toString() + ", " + c.toString();
now notice that this will give you the decimal values.. if you want the hex, octal, etc, that's a different question.

Suppose we have the following variables:
int age = 5;
String name = "Mohammad";
double weight = 68.4;
If we want to print them out joined in a string with one statement we can say:
System.out.println("My name is " + name + ", I am " + age + " years old, " + " I once caught a fish that weighs " + weight +"kg");
In Java, using the + operator you can concatenate strings.
Note: age, name, and weight are all of different types, but when you put the + operator with a String, java automatically convert that variable to a string and then concatenates it with the rest of the string. Hence, if you wish to perform some kind of operation then concatenate, then you should make use of parentheses ():
System.out.println("Two Plus Five is = " + (2 + 5));

Java: How do I right justify a $?

Here's what I got:
outputStr = name + "\n" + "Gross Amount:$ " + String.format("%.2f", grossAmount) + "\n"
+ "Federal Tax:$ " + String.format("%.2f", fedIncomeTax) + "\n" + "State Tax:$ "
+ String.format("%.2f", stateTax) + "\n" + "Social Security Tax:$ " + String.format("%.2f", ssTax)
+ "\n" + "Medicare/Medicaid Tax:$ " + String.format("%.2f", medicareTax) + "\n" + "Pension Plan:$ "
+ String.format("%.2f", pensionPlan) + "\n" + "Health Insurance:$ " + String.format("%.2f", HEALTH_INSURANCE)
+ "\n" + "Net Pay:$ " + String.format("%.2f", netPay);
System.out.println(outputStr);
It prints out like this:
Random Name
Gross Amount:$ 3575.00
Federal Tax:$ 536.25
And so on...
But I want to right justify the $ and variables 15 spaces to the right, how is this done? I want it like this:
Gross Amount: $3575.00
Thanks in advance...

Printf is a good implementation here but string format should work for your purposes.
// This will give it 20 spaces to write the prefix statement and then the
//space left will be "tacked" on as blank chars.
String.format("%-20s",prefixStatement);
//Below is the printf statement for exactly what you want.
System.out.printf("%-20s$%.2f\n","Gross Amount:",3575.00);
//This executes and returns: **Gross Amount: $3575.00**
//Below will get you fifteen spaces every time.
String ga = "Gross Amount:";
System.out.printf("%-"+(ga.length()+15)+"s$%d\n","Gross Amount:",2);
//This executes and returns: **Gross Amount: $2**
The idea behind string formatting is you're building a string and then adding in characters to it later through the parameters of String.format and printf. Hope this helps.

How to include a returned string in another method - java

this is probably a very basic problem but as I am only a beginner, this is confusing me. I am trying to make capitalise the first letter of a string, which I have done with the following code:
public String capitalizeFirstLetter(String product){
String productCap = product.substring(0, 1).toUpperCase() + product.substring(1);
return productCap; }
And then this capitalised version of the product just be placed in a letter writer method:
public void writeALetterChallenge(String nameFirst, String nameLast, String city, String product, String company, double retail, int numItem){
UI.println("Dear " + nameFirst);
UI.println(" You have been especially selected from the people of " + city);
UI.println("to receive a special offer for "+ product);
UI.println(productCap + " from " + company + " is a premium brand prodcut and"); UI.printf("retails for $%1.2f" + ". But, " + nameFirst + ",if you order your " + product + "\n", (retail));
UI.println("today, you can purchase it for just $" + (retail - (retail * 0.60)) + ", a saving of 60%!");
UI.println("As a special bonus, just for the " + nameLast + "family, if you order"); UI.println(numItem + " " + product + " today, you will get an additional 10% off - "); UI.println("an amazing price for " + product + " of just $" + (retail - (retail * 0.70)) + "!");
UI.println(" ");
UI.println("Hurry today and send in your order for " + product + " from " + company); UI.println("and make these fantastic savings.");
UI.println(" "); }
However my problem is that when I compile, I get the error that productCap cannot be found. So I've obviously missed something. How do I go about getting the productCap variable from the first method to be included in the second?
Any explanation on this would be great, thanks!

You should call your method:
UI.println(capitalizeFirstLetter(product) + " from " + compan ...

I think instead of this
UI.println(productCap + " from " + company + " is a premium brand prodcut and");
you want to have this
UI.println(capitalizeFirstLetter(product) + " from " + company + " is a premium brand prodcut and");

YOu can call your method as follows
UI.println(capitalizeFirstLetter(product) + " from " + company + " is a premium brand prodcut and");
Your variable productCap is local to method CapitalizaFirstLetter() and hence not accessible in another method.
To access the value of productCap, simply call CapitalizeFirstLetter() method so that it returns the value of productCap.

count incrementer is wrong

My assignment calls for the line number to be display with the output. The professor suggested I do it with a counter and as seeing Java doesn't have an easy way to print out the current line number, I just created a counter as suggested. The below code is as follows:
//Count Increment
for (count = 1; count<= 5; count++)
{
}
//Display information
System.out.println(count + "." + " " + "Street:"+ " " + streetName + " " + "#" + streetNumber);
System.out.println(count + "." + " " + "Total Rooms:"+ " " + numofRooms);
System.out.println(count + "." + " " + "Total Area:"+ " " + totalSqFt + " sq.ft");
System.out.println(count + "." + " " + "The price per Sq. Ft is " + "$" + priceperSqFt);
System.out.println(count + "." + " " + "The estimated property value is "+ "$" + estimatedPropertyvalue);
However, the output starts the line counter at six as demonstrated here:
6. Street: park avenue #44
6. Total Rooms: 5
6. Total Area: 2500.0 sq.ft
6. The price per Sq. Ft is $120.4
6. The estimated property value is $301000.0
Removing the brackets doesn't help either. How can I get the line count to correctly state 1,2,3,4,5?
Please ask for clarification if needed!! Thanks.

Your prints are outside of the for loop. Your for loop ends when the counter is "6" which is when it exits the for loop. This variable doesn't change so the current value is "6",that is why it always prints "6" below on your code. If you want to print the line number for each instruction you could do something like this:
count = 0;
System.out.println(++count + "." + " " + "Street:"+ " " + streetName + " " + "#" + streetNumber);
"++count", you increment the variable the moment you write a line, in the first case it should print 1 then 2 etc. Hope this helped :)
The loop is not required cause you are only counting the lines one time each. If you put those lines in a loop that goes from 0 to 5 you will be counting each line 5 times. Since you only need to count each line ONE time you dont need the loop and just the simple increment I previously mentioned. Hope this clears out why the loop is not required

I assume that you have somewhere above this a line defining count:
int count;
So after the for loop, you've incremented count to 6 and then started printing with count left at the last incremented value from the for loop.
So, remove the for loop and just pre-increment the count variable for each line of ouput.
int count = 0;
//Display information
System.out.println( (++count) + "." + " " + "Street:"+ " " + streetName + " " + "#" + streetNumber);
...

class Print{
static int lineno = 0;
private int static getLineNo(){
lineno = lineno + 1;
return lineno;
}
}
//Display information
System.out.println(Print.getLineNo() + "." + " " + "Street:"+ " " + streetName + " " + "#" + streetNumber);
System.out.println(Print.getLineNo() + "." + " " + "Total Rooms:"+ " " + numofRooms);
System.out.println(Print.getLineNo() + "." + " " + "Total Area:"+ " " + totalSqFt + " sq.ft");
System.out.println(Print.getLineNo() + "." + " " + "The price per Sq. Ft is " + "$" + priceperSqFt);
System.out.println(Print.getLineNo() + "." + " " + "The estimated property value is "+ "$" + estimatedPropertyv