代码一：
public class CountInstances
{
private static int numInstances=0;

protected static int getNumInstance()
{
return numInstances;
}

CountInstances()
{
numInstances++;
}

public static void main(String[] arg)
{
System.out.println("Starting with "+CountInstances.getNumInstance() +" instance");
for(int i=0;i<10;++i)
new CountInstances();
System.out.println("Starting with "+CountInstances.getNumInstance() +" instance");
}
}


代码二：
public class CountInstances
{
private static int numInstances=0;

protected static int getNumInstance()
{
return numInstances;
}

private static void assInstance()
{
numInstances++;
}

CountInstances()
{
CountInstances.addInstance();
}

public static void main(String[] arg)
{
System.out.println("Starting with "+CountInstances.getNumInstance() +" instance");
for(int i=0;i<10;++i)
new CountInstances();
System.out.println("Starting with "+CountInstances.getNumInstance() +" instance");
}
}

请比较两个代码哪个优化，为什么？