?? test.java
字號:
class test
{
public static void foo()
{
int j = 5;
int[] a = new int[1000000];
for (int i=0; i<1000000; i++)
{
a[i] = j;
if (j == 5)
a[i] = 25;
else
a[i] = 10;
}
}
public static void bar()
{
int[] a = new int[1000000];
for (int i=0; i<1000000; i++)
a[i] = 25;
}
public static void main(String args[])
{
int val = Integer.parseInt(args[0]);
System.gc();
long start = System.currentTimeMillis();
for (int i=0;i<val;i++)
foo();
long end = System.currentTimeMillis();
System.out.println("foo is " + (end-start));
long num = end-start;
System.gc();
start = System.currentTimeMillis();
for (int i=0;i<val;i++)
bar();
end = System.currentTimeMillis();
System.out.println("bar is " + (end-start));
num=(num-(end-start))*100/num;
System.out.println("bar is " + num + " percent faster");
}
}
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