谁能给我发下一些 JAVA的源代码。。。。感激不尽。。。（能复制的）

你要什么源代码，关于什么的？

这是我写的求阶乘和的程序，不知道对你有帮助没
public class Test1 {

public static void main(String args[]) {
long a, u, b;
u = 1;
b = 0;
String str = null;
for (a = 1; a <= 20; a++) {
u = u * a;
b = b + u;
if (a == 1) {
str = a + "!";
} else {
str = str + "+" + a + "!";
}
System.out.println(str + "=" + b);
}

}
}

结果

1!=1
1!+2!=3
1!+2!+3!=9
1!+2!+3!+4!=33
1!+2!+3!+4!+5!=153
1!+2!+3!+4!+5!+6!=873
1!+2!+3!+4!+5!+6!+7!=5913
1!+2!+3!+4!+5!+6!+7!+8!=46233
1!+2!+3!+4!+5!+6!+7!+8!+9!=409113
1!+2!+3!+4!+5!+6!+7!+8!+9!+10!=4037913
1!+2!+3!+4!+5!+6!+7!+8!+9!+10!+11!=43954713
1!+2!+3!+4!+5!+6!+7!+8!+9!+10!+11!+12!=522956313
1!+2!+3!+4!+5!+6!+7!+8!+9!+10!+11!+12!+13!=6749977113
1!+2!+3!+4!+5!+6!+7!+8!+9!+10!+11!+12!+13!+14!=93928268313