完數的java

Ⅰ JAVA編程 完全數

public class PerfectNumber{
private static String[] isPrefectnumber(int n){
int sum=0;

StringBuffer sBuffer = new StringBuffer();;
for (int i = 1; i < n; i++) {
if (n % i == 0){
sum += i;
sBuffer.append(","+i);
}
}
if (sum==n) {
return sBuffer.toString().replaceFirst(",", "").split(",");
}else {
return new String[0];
}
}
public static void main(String[] args){
String[] al= isPrefectnumber(t);
if (al.length!=0) {
StringBuffer sb = new StringBuffer();
sb.append(t+"是完數，其因子為");
for (int i = 0; i <al.length ; i++) {
sb.append("，"+al[i]);
}
System.out.println(sb.toString());
} else {
System.out.println(t+"不是完數");
}
}
}