Shiny0815的博客

数组初始化式只能用于声明同时赋值的情况下如果没有显式赋值，则系统自动赋默认值nullJava的对象都是在堆上分配空间① String  [ ] a=new String[ ]{" "," "," " };②String [ ] a={" "," "," " };③String [ ] a=new String[5];  a[0]='1', a[1]='2';如：St

char a[] = {'a','2'};   char[] a=  new char[]{'a','2'};    char[] a=  new char[4]；a[0]='a'; a[1]='2';

int[][] a=new  int[][]{{1,2},{3,4},{5,6,7,8,9},{}};      System.out.println(a.length);//4,表示数组的行数      System.out.println(a[0].length);//2，表示对应行的长度      System.out.println(a[1].length);//2      System...