这段代码运行得很好,但不幸的是,由于Arrays.sort()Comparator,它触发了垃圾收集。
有没有一种方法不会触发垃圾回收?
(注意:此代码已被修改为更"通用"。实际代码适用于Android游戏,这就是为什么垃圾回收导致的速度减慢是一个问题。)
static final byte INCOME = 0;
static final byte INDEX = 1;
public void vSortEmployees() {
nPaidEmployees = 0;
for (nIter=0; nIter<MAX_EMPLOYEES; nIter++) {
if ((employees[nIter].current == true) && (employees[nIter].volunteer == false)) {
// We have another current and paid employee; add that employee's "amount earned to date" to the list.
paidemployees[nPaidEmployees][INCOME] = employees[nIter].fGetTotalIncomeToDate();
paidemployees[nPaidEmployees][INDEX] = nIter;
nPaidEmployees++;
}
}
Arrays.sort(paidemployees, new Comparator<float[]>() {
@Override
public int compare(float[] f1, float[] f2) {
if (f2[INCOME] < f1[INCOME])
return -1;
else if (f2[INCOME] > f1[INCOME])
return 1;
else
return 0;
}
});
// Now we have a list of current, paid employees in order of income received.
// Highest income paid out
paidemployees[0][INCOME]
// Second highest income paid out
paidemployees[1][INCOME]
// If we need to reference the original employee object, we can:
employees[paidemployees[0][INDEX]].getName();
}
没有办法一致地触发或不触发GC。GC过着自己的生活。它在对数组进行排序时运行,这并不意味着什么。
但是不管怎样,你还是可以做点什么的。只是不要使用比较器的匿名内部类。你其实并不需要这个。使用正则类并将其对象创建为singleton。然后使用这个实例。在这种情况下,在排序期间不会在代码中创建新对象,GC可能不会运行。
class FloatArrayComparator implements Comparator<float[]>() {
@Override
public int compare(float[] f1, float[] f2) {
if (f2[INCOME] < f1[INCOME])
return -1;
else if (f2[INCOME] > f1[INCOME])
return 1;
else
return 0;
}
};
class SomeClass {
private Comparator<float[]> floatArrayComparator = new FloatArrayComparator();
void myMethod() {
Arrays.sort(myArray, floatArrayComparator);
}
}