for文で初期化

homework.java

public class Homework {
	public static void main(String[] args) {
		int[] array = new int[30];
		for (int i = 0; i < 30; i++) {
			array[i] = i + 1;
		}
		int total = 0;
		for (int i = 0; i < array.length; i++) {
			total += array[i];
		}
		System.out.println("合計は" + total + "です");
	}
}