public class Test {public static void main(String[] args){ System.out.println("1 到 1000 的完数"); for ( int i=1 ; i<100.;i++){ int a=0;for( int j=1; j<=i/2;j++){if(i% j == 0){ a=a+j; }}if (a == i){ System.out.println(" "+ i);}}}}