String s = Arrays.toString(arr);
public staic void main(String[] args){
int[] arr = {2,34,5,323,645,32,43};
// 打印數組
System.out.println(arr); // [I@2ac1fdc4
//數組內容轉化爲字符串
String s = Arrays.toString(arr);
System.out.println(s); // [2,34,5,323,645,32,43]
}