public Generic scalarProduct(JSCLVector vector) {
Generic a = JSCLInteger.valueOf(0);
for (int i = 0; i < n; i++) {
a = a.add(element[i].multiply(vector.element[i]));
}
return a;
}
static Generic terminator(Generic generic, Variable var, boolean tail) {
Generic x = var.expressionValue();
Generic a = JsclInteger.valueOf(1);
Iterator it = IntegerDivisor.create(generic.integerValue());
while (it.hasNext()) {
Generic s = (Generic) it.next();
a = a.multiply(x.subtract(s));
if (!tail) a = a.multiply(x.add(s));
}
return a;
}
static Generic factorize(JsclInteger integer) {
Generic n[] = integer.gcdAndNormalize();
Generic s = n[1];
Generic a = JsclInteger.valueOf(1);
Generic p = JsclInteger.valueOf(2);
while (s.compareTo(JsclInteger.valueOf(1)) > 0) {
Generic q[] = s.divideAndRemainder(p);
if (q[0].compareTo(p) < 0) {
p = s;
q = s.divideAndRemainder(p);
}
if (q[1].signum() == 0) {
a = a.multiply(expression(p, true));
s = q[0];
} else p = p.add(JsclInteger.valueOf(1));
}
return a.multiply(n[0]);
}
/*
* 有泛型的情况
* 使得程序具有更好的可读性和安全性
*/
private static void test1() throws Exception {
// 代码更具有可读性.
Generic<String> bc = new Generic();
String s = "OK";
File file = new File("e:/1.txt");
// 问题:在添加元素时,会检查错误,只可以向数组列表中添加指定类的对象.
bc.add(s);
// 由于加入的元素不是String类型,故报错.
// bc.add(file);//error The method add(String) in the type Generic<String> is not applicable
// for the arguments (File)
/*
* 不用强制转换
* 擦除get的返回类型后将返回Object类型.编译器自动插入String的强制类型转换.
* 也就说,编译器把这个方法调用翻译为两条虚拟机指令:
* 1.对原始方法get的调用.
* 2.将返回的Object类型强制转换为String类型.
*/
String s1 = bc.get(0);
}
public Generic divergence(Variable variable[]) {
Generic a = JSCLInteger.valueOf(0);
for (int i = 0; i < n; i++) a = a.add(element[i].derivative(variable[i]));
return a;
}