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                1.使用數組 ![](https://box.kancloud.cn/56d96b52218bbd5e49f1f235052103bb_755x305.png) ~~~ package array; public class Array1 { public static void main(String[] args){ /*int[] arr; arr = new int[5];*/ //int[] arr=new int[5]; /*arr[0]=1; arr[1]=2; arr[2]=3; arr[3]=4; arr[4]=5;*/ int[] arr={1,2,3}; System.out.println(arr[1]); } } ~~~ 2.數組筆記 ~~~ java中都有哪些數組類型? char char[] int int[] double double[] String String[] Scanner Scanner[] Random Random[] 第一種使用數組的方式 int arr[] arr= new int[5]; arr[0]=10; 第二種使用數組的方式 int[] arr=new int[5]; arr[0]=22; 第三種使用數組的方式 int[] arr={22,43,10}; ~~~ 3.沒賦值時,int[]默認為0,String[]默認為null ![](https://box.kancloud.cn/ae3138689cb404cc8bac1a7bf8ab5a93_480x160.png)
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