一維數組:
三種定義方法:
1.String [] arr = new String[4];
2.String [] arr = new String[]{"a","b","c","d"};
注意這種寫法->String [] arr = new String[4]{"a","b","c","d"}; 編譯會不通過
3.String [] arr = {"a","b","c","d"};
ps:至於[]在變量名arr前還是後,這個寫法沒有固定的要求,但是最好按照書上的標準來。
二維數組:
int [][] a = new int[3][4]; //3行4列
int [][] a = new int[3][]; //定義時行數不可省略,列數可省略