JAVA-数组元素动态初始化

package com.itheima;

public class shuzu02 {
    public static void main(String[] args) {
        //格式：数据类型[] 变量名 = new 数据类型[数组长度]
        int[] arr=new int[3];

        //输出数组名
        System.out.println(arr);//[I@1b6d3586

        //输出数组中的元素
        System.out.println(arr[0]);
        System.out.println(arr[1]);
        System.out.println(arr[2]);
        System.out.println("----------------------------");
        //修改数组中的元素

        arr[0]=10;
        arr[1]=20;
        arr[2]=30;

        //再次输出数组中的元素
        System.out.println(arr[0]);
        System.out.println(arr[1]);
        System.out.println(arr[2]);
        System.out.println("----------------------------");

    }
}

执行结果

"C:\Program Files\Java\jdk1.8.0_261\bin\java.exe" "-javaagent:D:\app\workspace\IntelliJ IDEA Community Edition 2022.2.3\lib\idea_rt.jar=56972:D:\app\workspace\IntelliJ IDEA Community Edition 2022.2.3\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_261\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\rt.jar;C:\Users\Administrator\IdeaProjects\ITHEIMA\out\production\ITHEIMA" com.itheima.shuzu02
[I@1b6d3586
0
0
0
----------------------------
10
20
30
----------------------------

Process finished with exit code 0

//静态初始化
int[] arr={1,2,3}