静态初始化和动态初始化

package com.karl1;

//动态初始化：适合开始不确定具体元素值，只知道元素个数的业务场景
//静态初始化：适合一开始就知道存入哪些元素值的业务场景
public class ArrayDemo3 {
    public static void main(String[] args) {
        //动态初始化数组
        //数据类型[] 数组名=new 数据类型[长度]
        int[] age=new int[3];
        System.out.println(age[0]);
        System.out.println(age[1]);
        System.out.println(age[2]);

        //后赋值
        age[0]=12;
        age[1]=18;
        age[2]=32;

        System.out.println(age[0]);
        System.out.println(age[1]);
        System.out.println(age[2]);

        System.out.println("--------------------------------------------");
        //不同数据类型的默认值
        char[] chars=new char[3];
        System.out.println((int) chars[0]);//转化成int类型
        System.out.println((int) chars[2]);

        double[] doubll=new double[80];
        System.out.println(doubll[0]);
        System.out.println(doubll[79]);

        boolean[] flag=new boolean[100];
        System.out.println(flag[0]);
        System.out.println(flag[99]);

        String[] name=new String[80];
        System.out.println(name[0]);
        System.out.println(name[79]);


    }
}