Write a Java console application that reads a string from the keyboard and tests
ID: 3795423 • Letter: W
Question
Write a Java console application that reads a string from the keyboard and tests whether it contains a valid date. Display the date and a message that indicates whether it is valid. If it is not valid, also display a message explaining why it is NOT valid.
The input date will have the format mm/dd/yyyy.
A valid month value mm must be from 1 to 12 (January is 1). You can use:
String monthPart = inputDate.substring(0, 2);
int month = Integer.parseInt(monthPart);
to get the month value.
A valid day value dd must be from 1 to a value that is appropriate for the given month. September, April, June, and November each have 30 days. Assume February has 28 days. All other months have 31 days.
The year can be any 4 digit year.
***Be sure to use a switch statement at least once (perhaps for checking the valid months)***
---------------
help please it must have
String monthPart = inputDate.substring(0, 2);
int month = Integer.parseInt(monthPart);
to get the month value.
Explanation / Answer
import java.util.StringTokenizer;
import javax.swing.JOptionPane;
public class TestDate
{
public static void main(String[] args)
{
String date=JOptionPane.showInputDialog("Enter the date");
date=date.trim(); // mm/dd/yyyy or mm-dd-yyyy
check(date);
}
public static void check(String date)
{
int a[]=new int[3];
StringTokenizer st=new StringTokenizer(date,"/-");
if(date.indexOf("/")>0 && date.indexOf("-")>0){ // mixed combo of /,- is an error
System.out.println(date+" Not Valid: use either / or - ."); return; }
else
for(int i=0;st.hasMoreTokens();i++) // storing values in array
a[i]=Integer.parseInt(st.nextToken());
if(a[0]>12 || a[0]<1) { // checking if month exceeds 12
System.out.println(date+" Not Valid: Month has to b/w 1 and 12 inclusive.");
return;
}
if(a[1]>31 || a[0]<1) { // checking if date exceeds 31
System.out.println(date+" Not Valid: date has to b/w 1 and 31 inclusive.");
return;
}
String month[]={"January","February","March","April","May","June","July","August","September","October","Novermber","December"};
boolean monthCheck= a[0]==4 || a[0]== 6|| a[0]==9 || a[0]==11;
if(monthCheck && a[1]==31){ // checking if for specific months date exceeds 30
System.out.println(date+" Not Valid: "+month[a[0]-1]+" month has only 30 days");
return;
}
boolean yea=false;
yea=a[2]%400==0 || (a[2]%4==0 && a[2]%100!=0 );
if(!yea && a[0]==2 && a[1]>28){ // not leap year, feb, date exceeds 28
System.out.println(date+" Not valid: In non leap year ("+a[2]+"), February has only 28 days"); return; }
else if (yea && a[0]==2 && a[1]>29) {// leap year, feb, date exceeds 29
System.out.println(date+" Not Valid: In leap year ("+a[2]+"), February has only 29 days"); return; }
System.out.println("Date ("+date+") is correct");
}
}
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