Question

2．利用Java的多线程技术，编写一个即可以求20以内偶数和又可以求20以内偶数积 的程序。

Answer 1

我写了个，你参考下：
class changing{
class jishuhe extends Thread{
public void run() {
Integer sum = 0;
for (int i = 0; i < 20; i++) {
if( i%2 == 0 ){
sum = sum + i ;
}
}
System.out.println("20以内偶数和："+ sum);
}
}
class jishuji extends Thread{
public void run() {
Integer sum = 1;
for (int i = 1; i < 20; i++) {
if( i%2 == 0 ){
sum = sum * i ;
}
}
System.out.println("20以内偶数积："+ sum);
}
}
public static void main(String[] args) {
jishuhe he = new changing().new jishuhe();
he.start();
jishuji ji = new changing().new jishuji();
ji.start();
}
}