If you use an array in your program, you need to be sure that you always access it with a valid subscript:
Java > cat prog75.java
public class prog75
{
public static void main (String args[])
{
int[] n = new int[5];
for (int x=0;x<5;x++)
{
n[x]=2*x;
System.out.println("n[" + x + "] = " + n[x]);
}
System.out.println("Finished");
}
}
Java > javac prog75.java
Java > java prog75
n[0] = 0
n[1] = 2
n[2] = 4
n[3] = 6
n[4] = 8
Finished
Java >
…otherwise, you will get a run-time error:
Java > cat prog76.java
public class prog76
{
public static void main (String args[])
{
int[] n = new int[5];
for (int x=0;x<6;x++)
{
n[x]=2*x;
System.out.println("n[" + x + "] = " + n[x]);
}
System.out.println("Finished");
}
}
Java > javac prog76.java
Java > java prog76
n[0] = 0
n[1] = 2
n[2] = 4
n[3] = 6
n[4] = 8
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 5
at prog76.main(prog76.java:8)
Java >
