blocks|key|1300695|text|尝试将适当的行替换为：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1300696|myStringArray[0][x-1]+=+"a+string";
myStringArray[0][y-1]+=+"another+string";|code-block|syntax|javascript|1300697|您的代码不正确，因为子数组的长度为y，而索引从0开始。因此，设置为myStringArray[0][y]或myStringArray[0][x]将失败，因为索引x和y超出界限。|offset|length|style|CODE|1300698|String[][]+myStringArray+=+new+String+[x][y];是初始化矩形多维数组的正确方法。如果您希望它是锯齿状的(每个子数组可能具有不同的长度)，那么您可以使用类似于this+answer的代码。但是请注意，如果您需要一个完全矩形的多维数组，那么John关于您必须手动创建子数组的断言是不正确的。|1300699|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/1067073/java-multidimensional-array/1067087#1067087^0|0|0|H|1|X|J|1H|J|28|1|2A|1|0|0|19|2R|B|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@$I|Z|J|10|K|L]|$I|11|J|12|K|L]|$I|13|J|14|K|L]|$I|15|J|16|K|L]|$I|17|J|18|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|19|8|@$I|1A|J|1B|K|L]]|9|@$I|1C|J|1D|1|1E]]|A|$]]|$1|O|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

Try replacing the appropriate lines with:

<pre><code>myStringArray[0][x-1] = "a string";
myStringArray[0][y-1] = "another string";
</code></pre>

Your code is incorrect because the sub-arrays have a length of <code>y</code>, and indexing starts at 0. So setting to <code>myStringArray[0][y]</code> or <code>myStringArray[0][x]</code> will fail because the indices <code>x</code> and <code>y</code> are out of bounds.

<code>String[][] myStringArray = new String [x][y];</code> is the correct way to initialise a rectangular multidimensional array. If you want it to be jagged (each sub-array potentially has a different length) then you can use code similar to <a href="https://stackoverflow.com/questions/1067073/java-multidimensional-array/1067087#1067087">this answer</a>. Note however that John's assertion that you have to create the sub-arrays manually is incorrect in the case where you want a perfectly rectangular multidimensional array.

blocks|key|1515562|text|您可以像这样声明多维数组：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1515563|//+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%2B%2B)+{+++++++++++//+sa1.length+==+4
++++for+(int+j+=+0;+j+<+sa1[i].length;+j%2B%2B)+{+++++//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%2B%2B)+{
++++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"}};|code-block|syntax|javascript|1515564|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can declare multi dimensional arrays like :

<pre><code>// 4 x 5 String arrays, all Strings are null
// [0] -&gt; [null,null,null,null,null]
// [1] -&gt; [null,null,null,null,null]
// [2] -&gt; [null,null,null,null,null]
// [3] -&gt; [null,null,null,null,null]

String[][] sa1 = new String[4][5];
for(int i = 0; i &lt; sa1.length; i++) { // sa1.length == 4
 for (int j = 0; j &lt; 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 &lt; sa2.length; i++) {
 String[] anon = new String[ /* your number here */];
 // or String[] anon = new String[]{"I'm", "a", "new", "array"};
 sa2[i] = anon;
}

// [0] -&gt; ["I'm","in","the", "0th", "array"]
// [1] -&gt; ["I'm", "in", "another"]
String[][] sa3 = new String[][]{ {"I'm","in","the", "0th", "array"},{"I'm", "in", "another"}};
</code></pre>

blocks|key|1515619|text|您还可以使用以下结构：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1515620|String[][]+myStringArray+=+new+String+[][]+{+{+"X0",+"Y0"},
+++++++++++++++++++++++++++++++++++++++++++++{+"X1",+"Y1"},
+++++++++++++++++++++++++++++++++++++++++++++{+"X2",+"Y2"},
+++++++++++++++++++++++++++++++++++++++++++++{+"X3",+"Y3"},
+++++++++++++++++++++++++++++++++++++++++++++{+"X4",+"Y4"}+};|code-block|syntax|javascript|1515621|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can also use the following construct:

<pre><code>String[][] myStringArray = new String [][] { { "X0", "Y0"},
 { "X1", "Y1"},
 { "X2", "Y2"},
 { "X3", "Y3"},
 { "X4", "Y4"} };
</code></pre>

blocks|key|1300897|text|我要补充的是，如果你想阅读尺寸，你可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1300898|int[][][]+a+=+new+int[4][3][2];

System.out.println(a.length);++//+4
System.out.println(a[0].length);+//+3
System.out.println(a[0][0].length);+//2|code-block|syntax|javascript|1300899|您也可以使用jagged+arrays，其中不同的行具有不同的长度，因此可以使用a[0].length+!=+a[1].length。|offset|length|style|CODE|1300900|entityMap|0|LINK|mutability|MUTABLE|url|http://www.java2s.com/Book/Java/0020__Language-Basics/Jagged_array.htm^0|0|0|14|Q|6|D|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@$I|X|J|Y|K|L]]|9|@$I|Z|J|10|1|11]]|A|$]]|$1|M|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

I'll add that if you want to read the dimensions, you can do this:

<pre><code>int[][][] a = new int[4][3][2];

System.out.println(a.length); // 4
System.out.println(a[0].length); // 3
System.out.println(a[0][0].length); //2
</code></pre>

You can also have <a href="http://www.java2s.com/Book/Java/0020__Language-Basics/Jagged_array.htm" rel="nofollow">jagged arrays</a>, where different rows have different lengths, so <code>a[0].length != a[1].length</code>.

blocks|key|1515723|text|+int[][]+myNums+=+{+{1,+2,+3,+4,+5,+6,+7},+{5,+6,+7,+8,+9,+10,+11}+};
+for+(int+x+=+0;+x+<+myNums.length;+%2B%2Bx)+{
++++for(int+y+=+0;+y+<+myNums[i].length;+%2B%2By)+{
+++++++System.out.print(myNums[x][y]);
++++}
+}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1515724|输出|unstyled|1515725|1+2+3+4+5+6+7+5+6+7+8+9+10+11|1515726|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code> int[][] myNums = { {1, 2, 3, 4, 5, 6, 7}, {5, 6, 7, 8, 9, 10, 11} };
 for (int x = 0; x &lt; myNums.length; ++x) {
 for(int y = 0; y &lt; myNums[i].length; ++y) {
 System.out.print(myNums[x][y]);
 }
 }
</code></pre>

Output

1
2
3
4
5
6
7
5
6
7
8
9
10
11

What is the correct way to declare a multidimensional array and assign values to it?

This is what I have:

<pre><code>int x = 5;
int y = 5;

String[][] myStringArray = new String [x][y];

myStringArray[0][x] = "a string";
myStringArray[0][y] = "another string";
</code></pre>

Initialising a multidimensional array in Java

声明多维数组并为其赋值的正确方法是什么？这就是我所拥有的：int x = 5;int y = 5;String[][] myStringArray = new String [x][y];myStringArray[0][x] = "a string";myStringArray[0][y] = "another st...

问在Java中初始化多维数组
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