java 多维数组初始化_用Java初始化多维数组

参考链接： Java多维数组

您可以声明多维数组如下：

 // 4 x 5 String arrays, all Strings are null

 // [0] -> [null,null,null,null,null]

 // [1] -> [null,null,null,null,null]

 // [2] -> [null,null,null,null,null]

 // [3] -> [null,null,null,null,null]

 String[][] sa1 = new String[4][5];

 for(int i = 0; i < sa1.length; i++) {           // sa1.length == 4

 for (int j = 0; j < sa1[i].length; j++) {     //sa1[i].length == 5

 sa1[i][j] = "new String value";

 }

 }

 // 5 x 0  All String arrays are null

 // [null]

 // [null]

 // [null]

 // [null]

 // [null]

 String[][] sa2 = new String[5][];

 for(int i = 0; i < sa2.length; i++) {

 String[] anon = new String[ /* your number here */];

 // or String[] anon = new String[]{"I'm", "a", "new", "array"};

 sa2[i] = anon;

 }

 // [0] -> ["I'm","in","the", "0th", "array"]

 // [1] -> ["I'm", "in", "another"]

 String[][] sa3 = new String[][]{ {"I'm","in","the", "0th", "array"},{"I'm", "in", "another"}};