I'm just working on a easy easy program with for loop and while loop, and an ArrayIndexOutOfBoundsException occurred.
Here is my code:
public class ForWhileLoops
{
public static void main(String[] args)
{
int[] mary = new int[30];
for(int a = 0; a < 31; a++)
{
mary[a]= a*3;
}
for(int b = 0; b < 31; b++)
{
System.out.println(mary);
}
int c = 0;
while(c < 31)
{
c++;
System.out.println(c);
}
}
}
And here is the error that occurred:
java.lang.ArrayIndexOutOfBoundsException: 30
at ForWhileLoops.main(ForWhileLoops.java:9)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at edu.rice.cs.drjava.model.compiler.JavacCompiler.runCommand(JavacCompiler.java:272)
int[] mary = new int[30];
Array are indexed starting from 0.
So an int[30] array will have valid indices from 0 to 29
for(int a = 0; a < 31; a++)
in the last iteration you are accessing mary[30] which is out of the bounds of your array.
Fix this by replacing it with
for(int a = 0; a <mary.length; a++)
With this solution if you change the size of your array you don't have to change the for loop
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