Hi,
I'm working on the homework for Lab 1011. My program compiles clean and
the expected results are produced BUT I have extra messages. Can someone
confirm if they are warning messages or is my code wrong? The results
are confusing.
Thank You!
Here is the output of my code:
-------------------------------------------------------
These are the argument names:
Trevor
Karen
Jenna
Brooke
The new name for Trevor is r
The new name for Karen is a
The new name for Jenna is e
Exception in thread "main" java.lang.NullPointerException
The new name for Brooke is r
at BuiltinClasses.generateNewName(BuiltinClasses.java:52)
at BuiltinClasses.main(BuiltinClasses.java:46)
Java Result: 1
BUILD SUCCESSFUL (total time: 0 seconds)
---------------------------------------------------------------
Here is my code:
------------------------------------------------------------------
public class BuiltinClasses {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
// Check for correct command line argument
if((args.length < 6) || (args.length > 12)) {
System.out.println("Argument is incorrect.");
System.out.println("Expecting 3 to 6 names and ages.");
System.out.println("example: Jane 30 Joe 35 Jill 13");
System.exit(0);
}
// Move arguments into an array
int max = 6;
int j = 0;
int k = 0;
String [] names = new String [max];
String [] ages = new String [max];
System.out.println("These are the argument names:");
for(int i=0;i < args.length;i++){
if (i==1 | i==3 | i==5 | i==7 | i==9 | i==11) {
ages [j] = args[i];
j++;
} else {
names [k] = args[i];
System.out.println(names[k]);
k++;
}
}
// call method to generate new names
generateNewName(names);
}
// Static method to alter name array
public static void generateNewName(String [] names){
for(int i=0;i < names.length;i++) {
char newName = names[i].charAt(1);
System.out.println("The new name for " + names[i] + " is " +
newName);
}
}
}
--------------------------------------------------------------
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