配列の作成：

1 ①String[] str = new String[5];
2 
3 ②String[] str = new String[]{"","","","",""};
4 
5 ③String[] str = {"","","","",""};
6 
7 ④String[][] str = new String[2][2];
8 
9 ⑤String[] str = new String[]{};

 配列の値の取得：

 1 //普通の方法
 2 String[][] str = new String[][]{{"a","b","c"},{"d","e","f"},{"g","h","i"}};
 
 3 for(int i=0;i<str.length;i++){
 4     for(int j=0;j<str[i].length;j++){
 5         System.out.println("str["+i+"]["+j+"]:"+str[i][j]);
 6     }
 7 }
 8 //方法一（推薦）
 9 String[][] str = new String[][]{{"a","b","c"},{"d","e","f"},{"g","h","i"}};
10 for(String[] row : str){
11     for(String s : row){
 
12         System.out.println(s);
13     }
14 }
15 //方法二（推薦）
16 String[][] str = new String[][]{{"a","b","c"},{"d","e","f"},{"g","h","i"}};
17 System.out.println(Arrays.deepToString(str));