?? test.java
字號:
import java.util.*;
class Test
{
public int usePrimitive(int increment)
{
int i=5;
for (int j=0;j<10000000;j++) {
i = i + increment;
}
return i;
}
public int useObject(Integer increment)
{
int i=5;
for (int j=0;j<10000000;j++) {
i = i + increment.intValue();
}
return i;
}
public static void main(String args[])
{
int val = Integer.parseInt(args[0]);
Test t = new Test();
long start = System.currentTimeMillis();
for (int i=0; i<val; i++)
t.usePrimitive(10);
long end = System.currentTimeMillis();
System.out.println("loop with int vals " + (end-start));
start = System.currentTimeMillis();
Integer inc = new Integer(10);
for (int i=0; i<val; i++)
t.useObject(inc);
end = System.currentTimeMillis();
System.out.println("loop with Integer vals " + (end-start));
}
}
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