I am in a programming class and this program is part of my homework. This file analyzes data from a file called "Names.txt" and then prints the information. I'm getting compilation errors and I want to know what I need to change or add to make it compile successfully.
Here is my code:
import java.util.Scanner;
import java.io.File;
import java.io.FileNotFoundException;
public class NameApp {
public static void main(String[] args) {
Scanner stdin = new Scanner(System.in);
String selection, nameIn, nameIn2;
Name name, name2;
int decade;
String first = "1", second = "2", third = "3", fourth = "4", fifth = "5", sixth = "6", seventh = "7", eighth = "8", ninth = "9", tenth = "10";
do {
System.out.println("Enter the character corresponding to your selection:");
System.out.println("a - Print histogram for a name");
System.out.println("b - Compare two names in a decade");
System.out.println("c - Print top ten names for a decade");
System.out.println("d - Quit (display file anomalies)");
selection = stdin.next();
System.out.println("your selection: " + selection);
if (selection.equalsIgnoreCase("a")) {
System.out.println("Enter a name: ");
nameIn = stdin.next();
name = nameIn.findName();
System.out.println("Histogram for name, " + name.getName());
}
if (selection.equalsIgnoreCase("b")) {
System.out.println("Enter a name: ");
nameIn = stdin.next();
name = nameIn.findName();
System.out.println("Enter a name: ");
nameIn2 = stdin.next();
name2 = nameIn.findName();
System.out.println("Enter number corresponding to your decade:");
System.out.println("1 - 1900-1909");
System.out.println("2 - 1910-1919");
System.out.println("1 - 1920-1929");
System.out.println("1 - 1930-1939");
System.out.println("1 - 1940-1949");
System.out.println("1 - 1950-1959");
System.out.println("1 - 1960-1969");
System.out.println("1 - 1970-1979");
System.out.println("1 - 1980-1989");
System.out.println("1 - 1990-1999");
System.out.println("1 - 2000-2005");
System.out.println("Enter a decade: ");
decade = stdin.nextInt();
System.out.println("Data for " + name.getName());
System.out.println(name.getHistoLine(decade));
System.out.println("Date for " + name2.getName());
System.out.println(name2.getHistoLine(decade));
}
if (selection.equalsIgnoreCase("C")) {
System.out.println("Enter number corresponding to your decade:");
System.out.println("1 - 1900-1909");
System.out.println("2 - 1910-1919");
System.out.println("1 - 1920-1929");
System.out.println("1 - 1930-1939");
System.out.println("1 - 1940-1949");
System.out.println("1 - 1950-1959");
System.out.println("1 - 1960-1969");
System.out.println("1 - 1970-1979");
System.out.println("1 - 1980-1989");
System.out.println("1 - 1990-1999");
System.out.println("1 - 2000-2005");
System.out.println("Enter a decade: ");
decade = stdin.nextInt();
System.out.println("Ten most popular names (male and female) during the decade 1990-1999 were: ");
System.out.println(first.findRank(decade));
System.out.println(second.findRank(decade));
System.out.println(third.findRank(decade));
System.out.println(fourth.findRank(decade));
System.out.println(fifth.findRank(decade));
System.out.println(sixth.findRank(decade));
System.out.println(seventh.findRank(decade));
System.out.println(eighth.findRank(decade));
System.out.println(ninth.findRank(decade));
System.out.println(tenth.findRank(decade));
}
if (!selection.equalsIgnoreCase("a") || !selection.equalsIgnoreCase("b") || !selection.equalsIgnoreCase("C") || !selection.equalsIgnoreCase("d"))
;
{
System.out.println("Invalid input. Try again");
}
}
while (!selection.equalsIgnoreCase("d"));
if (selection.equalsIgnoreCase("d")) {
}
}
public Static Name findName() {
String fileName = "Names.txt";
Scanner inputStream = null;
try {
inputStream = new Scanner(new File(fileName));
} catch (FileNotFoundException e) {
System.out.println("Error opening the file" + inputStream);
System.exit(0);
}
String line;
while (inputStream.hasNextLine()) {
line = inputStream.nextLine();
String[] nameLine = line.split(" ");
String babyName = nameLine[0];
int[] popularity;
for (int k = 0; k < nameLine.length; k++) {
popularity[k] = Integer.parseInt(nameLine[k + 1]);
}
if (this.equalsIgnoreCase(babyName)) {
Name name = new Name(babyName, popularity);
} else {
System.out.print("Sorry that name was not found");
}
}
return name;
}
public Static String findRank(int decade) {
String fileName = "Names.txt";
Scanner inputStream = null;
try {
inputStream = new Scanner(new File(fileName));
} catch (FileNotFoundException e) {
System.out.println("Error opening the file" + inputStream);
System.exit(0);
}
String top = "";
String line;
while (inputStream.hasNextLine()) {
line = inputStream.nextLine();
String[] nameLine = line.split(" ");
String babyName = nameLine[0];
int[] popularity;
for (int k = 0; k < nameLine.length; k++) {
popularity[k] = Integer.parseInt(nameLine[k + 1]);
}
if (popularity[decade - 1] == Integer.parseInt(this)) {
top = top + babyName + "(" + this + ")" + " ";
}
return top;
}
}
}
Here are the compilation errors
NameApp.java:126: ';' expected
public Static Name findName()
^
NameApp.java:126: invalid method declaration; return type required
public Static Name findName()
^
NameApp.java:161: ';' expected
public Static String findRank(int decade)
^
NameApp.java:161: invalid method declaration; return type required
public Static String findRank(int decade)
^
4 errors
Case sensitivity could be your issue. Check out Stack Overflow question Is Java case-sensitive?.
I would suggest altering the case of static:
public static Name findName()
A lot of your work seems wrong in this. For example, declarations of your strings.
There are a lot of problems here. I strongly encourage you to revisit tutorials and sit down with either a tutor or TA to hammer out the core syntax understandings.
staticis a keyword. It is case-sensitive. You must change all capitalized forms ofstaticto lower case.From what you have of your code, there isn't any class called
Name. That's going to pose a huge problem.nameInis aString. It will not have a method calledfindName.int[] popularitydoesn't have any size defined to it. You will be attempting to dereference null when you go to add things to this array. Declare its size appropriately bynew int[nameLine.length].These lines give out false information; I presume you meant to change them to a natural numerical ordering instead of having 1 all the way down?
System.out.println("1 - 1900-1909"); System.out.println("2 - 1910-1919"); System.out.println("1 - 1920-1929"); System.out.println("1 - 1930-1939"); System.out.println("1 - 1940-1949"); System.out.println("1 - 1950-1959"); System.out.println("1 - 1960-1969"); System.out.println("1 - 1970-1979"); System.out.println("1 - 1980-1989"); System.out.println("1 - 1990-1999"); System.out.println("1 - 2000-2005");first,second,...,tenthare all of typeString. They do not have a methodfindRank.
I'm sure there's more, but I'm going to stop here. Once you get those sorted out, you'll likely be in prime position to fix the rest.
来源：https://stackoverflow.com/questions/16269006/what-should-i-change-to-make-this-file-compile