JAVA基础：动态初始化数组

数组的动态初始化
定义数组先不存入具体元素值，只确定数组存储的数据类型和数组的长度

 

package com.itheima.arry;

public class ArrayDemo4 {
    public static void main(String[] args) {
        //定义数组的方式2
        int[] ages=new int[3];//动态初始化
        for (int i = 0; i < ages.length; i++) {
            System.out.println(ages[i]);
        }
        ages[0]=12;
        ages[1]=36;
        ages[2]=55;
        for (int i = 0; i < ages.length; i++) {
            System.out.println(ages[i]);
        }
    }
}

 

package com.itheima.arry;

public class ArrayDemo4 {
    public static void main(String[] args) {
        //定义数组的方式2
        int[] ages=new int[3];//动态初始化
        for (int i = 0; i < ages.length; i++) {
            System.out.println(ages[i]);
        }
        ages[0]=12;
        ages[1]=36;
        ages[2]=55;
        for (int i = 0; i < ages.length; i++) {
            System.out.println(ages[i]);
        }
        System.out.println("--------------------------------------");
        char[] chars=new char[2];
        for (int i = 0; i < chars.length; i++) {
            System.out.println((int)chars[i]);
        }
        System.out.println("--------------------------------------");

        double[] a=new double[2];
        for (int i = 0; i < a.length; i++) {
            System.out.println(a[i]);
        }
        System.out.println("--------------------------------------");
        String[] b=new String[2];
        for (int i = 0; i < b.length; i++) {
            System.out.println(b[i]);
        }

    }
}

 

 

 

 案例：

package com.itheima.arry;

import java.util.Scanner;

public class ArraDemo5 {
    public static void main(String[] args) {
        double[] score=new double[6];
        Scanner a=new Scanner(System.in);
        for (int i = 0; i < score.length; i++) {
            System.out.println("请您输入第"+i+"评委的分数；");
            score[i]=a.nextDouble();
        }
        double sum=0.0;
        for (int i = 0; i < score.length; i++) {
            sum +=score[i];
        }
        System.out.println(sum/score.length);
    }
}