This code is giving me a lot of erros, can someone please help fix this

See more:

Java

MyProgram.java:7: error: 'void' type not allowed here
question(System.out.println("Return true if the supplied character is 'a'"));
^
MyProgram.java:21: error: cannot find symbol
for (int i = 0; i < s.length() && aCounter <= 2; ++i) {
^
symbol: variable aCounter
location: class MyProgram
MyProgram.java:23: error: variable i is already defined in method hasTwoA(String)
for(int i = 0; i < s.length(); i++)
^
MyProgram.java:73: error: cannot find symbol
for(int i = 1; i < word.length; i++)
^
symbol: variable word
location: class MyProgram
MyProgram.java:75: error: cannot find symbol
if(word[i].length()>=four.length()){
^
symbol: variable word
location: class MyProgram
MyProgram.java:75: error: cannot find symbol
if(word[i].length()>=four.length()){
^
symbol: variable four

location: class MyProgram
MyProgram.java:97: error: cannot find symbol
switch (userInt){
^
symbol: variable userInt
location: class MyProgram
MyProgram.java:97: error: illegal start of type
switch (userInt){
^
MyProgram.java:122: error: cannot find symbol
days = 31;
^
symbol: variable days
location: class MyProgram
MyProgram.java:126: error: cannot find symbol
days = 29;
^
symbol: variable days
location: class MyProgram
MyProgram.java:131: error: cannot find symbol
days = 31;
^
symbol: variable days
location: class MyProgram
MyProgram.java:134: error: cannot find symbol
days = 30;
^
symbol: variable days
location: class MyProgram
MyProgram.java:137: error: cannot find symbol
days = 31;
^
symbol: variable days
location: class MyProgram
MyProgram.java:140: error: cannot find symbol
days = 30;
^

symbol: variable days
location: class MyProgram
MyProgram.java:143: error: cannot find symbol
days = 31;
^
symbol: variable days
location: class MyProgram
MyProgram.java:146: error: cannot find symbol
days = 31;
^
symbol: variable days
location: class MyProgram
MyProgram.java:149: error: cannot find symbol
days = 30;
^
symbol: variable days
location: class MyProgram
MyProgram.java:152: error: cannot find symbol
days = 31;
^
symbol: variable days
location: class MyProgram
MyProgram.java:155: error: cannot find symbol
days = 30;
^
symbol: variable days
location: class MyProgram
MyProgram.java:158: error: cannot find symbol
days = 31;
^
symbol: variable days
location: class MyProgram
20 errors

What I have tried:

import java.util.*;
public class MyProgram
{
public static void main(String[]args)
{
System.out.println("Problem 1 = " + isLetterA('a'));
question();
System.out.println(daysInMonth(2,1970));
}//end main

//problem1
public static boolean isLetterA(char letter)
{
return letter == 'a';
}//endproblem1

//problem2
public static boolean hasTwoA(String s)
{
boolean q = false;
for (int i = 0; i < s.length() && aCounter <= 2; ++i) {
int count = 0;
for(int i = 0; i < s.length(); i++)
{
if(s.charAt(i) == 'a')
count++;
}
if(count >= 2)
return true;
return q;
}}//endproblem2

//problem3
public static boolean isVowel(char letter)
{
boolean vowel = false;
if(letter == ('a'))
{
return true;
}
return false;
if(letter == ('e'))
{
return true;
}
return false;
if(letter == ('i'))
{
return true;
}
return false;
if(letter == ('o'))
{
return true;
}
return false;
if(letter == ('u'))
{
return true;
}
return false;
return vowel;
}//endproblem3


//problem4
public static String longestWord(String s)
{
int count = 0;
String[] c = s.split(" ");
int longest = c[0].length();
String returnStr = "";
for(int i = 1; i < word.length; i++)
{
if(word[i].length()>=four.length()){
{
longest = c[i].length();
} count = i;
}
}
returnStr = c[count];
return returnStr;
//endproblem4
}
//prob 5
public static void question()
{
Scanner console = new Scanner(System.in);
System.out.println("Which of the following will declare and intialize a variable in Java?");
System.out.println("1. int 1a=4;");
System.out.println("2. double circle-area=5.78;");
System.out.println("3. string s=hello!;");
System.out.println("4. boolean whoaNow = true;");
System.out.print("What is the correct answer? ");
int answer = console.nextInt();
console.nextLine();
switch (userInt){
case 1:System.out.println("Incorrect");
break;
case 2:System.out.println("Incorrect");
break;
case 3:System.out.println("Incorrect");
break;
case 4:System.out.println("Correct");
break;
}
}//end question

public static int daysInMonth(int month, int year)
{

boolean lYear = leapYear(year);
if ((month < 1 || month > 12) && (year < 1 || year > 9999))
{
return 29;
}
else
{
switch(month)
{
case 1:
days = 31;
break;
case 2:
if(year == 1) {
days = 29;
break;
}

case 3:
days = 31;
break;
case 4:
days = 30;
break;
case 5:
days = 31;
break;
case 6:
days = 30;
break;
case 7:
days = 31;
break;
case 8:
days = 31;
break;
case 9:
days = 30;
break;
case 10:
days = 31;
break;
case 11:
days = 30;
break;
case 12:
days = 31;
break;
}
}
}//end daysinMonth

public static boolean leapYear(int year)
{
if(year % 4 == 0)
{
if (year % 100 == 0)
{
if (year % 400 == 0)
{
//
}
//
}
//
}
//
}


}