Java一维数组常见示例分享

数组求和

public class Main {
    public static void main(String[] args) {
        int num[]={1,2,3,4,5,6,7,8,9,10};    //定义一维数组
        int sum = 0;
        System.out.println("一维数组中个元素之和为：");
        for(int i=0;i<num.length;i++){
            System.out.print(num[i]);
            if (i==9) {
                System.out.print("=");            }
            else if (i<9){
                System.out.print("+");
            }
            sum=sum+num[i];
        }
        System.out.print(sum);
    }
}

求数组平均值

求五个人的平均分，利用循环得出总和

int [ ] scores = {60, 80, 90, 70, 85};
int sum = 0;
double avg;
for(int i = 0; i < scores.length; i++){
     sum = sum + scores[i];
}
avg = sum / scores.length;
 
for(int score:scores)//for的强循环
{
    sum += score;
}

调用指定数组

public class Main {
    public static void main(String[] args) {
        int[] arr=new int[]{1,2,3};
        arr[1]=100;
        arr[2]=arr[1]*2;
        System.out.println(arr[2]);
    }
}