public class ArrayClassObj {
static Random rand = new Random();
static int pRand(int mod) {
return Math.abs(rand.nextInt()) % mod + 1;
}
public static void main(String[] args) {
Integer[] a = new Integer[pRand(20)];
prt("length of a = " + a.length);
for(int i = 0; i < a.length; i++) {
a[i] = new Integer(pRand(500));
prt("a[" + i + "] = " + a[i]);
}
}
static void prt(String s) {
System.out.println(s);
}
} ///:~
array = new MyClass[10];
//初始化数组
for (int i = 0; i < array.lenth(); i++) {
array[i] = new MyClass();
}
array[0].dosth() // WRONG, It's a null pointer !!!
}
}