用java写出一千以内的完数

Sure, I can help you with that. A perfect number is a positive integer that is equal to the sum of its positive divisors, excluding itself. For example, 6 is a perfect number because the sum of its positive divisors (excluding 6) is equal to 6: 1 + 2 + 3 = 6. Here's the Java code to find all the perfect numbers between 1 and 1000:

for (int i = 1; i <= 1000; i++) {
    int sum = 0;
    for (int j = 1; j < i; j++) {
        if (i % j == 0) {
            sum += j;
        }
    }
    if (sum == i) {
        System.out.println(i + " is a perfect number");
    }
}

This code loops through all the numbers from 1 to 1000 and checks if each number is a perfect number by finding the sum of its divisors. If the sum is equal to the number itself, then it's a perfect number and the code prints it out. I hope this helps!