?? arraygrowtest.java
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/**
* @version 1.00 11 Mar 1997
* @author Cay Horstmann
*/
import java.lang.reflect.*;
import corejava.*;
public class ArrayGrowTest
{ public static void main(String[] args)
{ int[] a = { 1, 2, 3 };
Day[] b = { new Day(1996, 1, 1), new Day(1997, 3, 26) };
a = (int[])goodArrayGrow(a);
arrayPrint(a);
b = (Day[])goodArrayGrow(b);
arrayPrint(b);
System.out.println
("The following call will generate an exception.");
b = (Day[])badArrayGrow(b);
}
static Object[] badArrayGrow(Object[] a)
{ int newLength = a.length * 11 / 10 + 10;
Object[] newArray = new Object[newLength];
System.arraycopy(a, 0, newArray, 0, a.length);
return newArray;
}
static Object goodArrayGrow(Object a)
{ Class cl = a.getClass();
if (!cl.isArray()) return null;
Class componentType = a.getClass().getComponentType();
int length = Array.getLength(a);
int newLength = length * 11 / 10 + 10;
Object newArray = Array.newInstance(componentType,
newLength);
System.arraycopy(a, 0, newArray, 0, length);
return newArray;
}
static void arrayPrint(Object a)
{ Class cl = a.getClass();
if (!cl.isArray()) return;
Class componentType = a.getClass().getComponentType();
int length = Array.getLength(a);
System.out.println(componentType.getName()
+ "[" + length + "]");
for (int i = 0; i < Array.getLength(a); i++)
System.out.println(Array.get(a, i));
}
}
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