?? test.java
字號:
class test
{
public static void foo(int val)
{
int a = 1; int b = 2; int c = 3;
int d = 4; int e = 5; int f = 6;
int x = 0;
for (int i=0; i<val; i++)
x = (f*a)+(f*b)+(f*c)+(f*d)+(f*e);
}
public static void bar(int val)
{
int a = 1; int b = 2; int c = 3;
int d = 4; int e = 5; int f = 6;
int x = 0;
for (int i=0; i<val; i++)
x = f*(a+b+c+d+e);
}
public static void main(String args[])
{
int val=Integer.parseInt(args[0]);
System.gc();
long start = System.currentTimeMillis();
foo(+val);
long end = System.currentTimeMillis();
System.out.println("foo is " + (end-start));
long num = end-start;
System.gc();
start = System.currentTimeMillis();
bar(val);
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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