纠正一个错误：

分配空间（也就是创建对象）names = new String[2][3];

以上不太确切，纠正一下：

声明  String[ ][ ] names;

分配空间（也就是创建对象）names = new String[ ][ ];

初始化 （确切说不叫赋值）  names = new String[ ][ ]{{"tom","jack","mike"},{"zhangsan","lisi","wangwu"}};

合并到一块就是：

String[ ][ ] names = new String[ ][ ]{{"tom","jack","mike"},{"zhangsan","lisi","wangwu"}};

简化后是

String[ ][ ] names = {{"tom","jack","mike"},{"zhangsan","lisi","wangwu"}};

把数组变量当作对象看待，数组变量保存的是数组的引用。只能在创建数组的时候给数组初始化。方法有二。

String[][] names = {{"tom","jack","mike"},{"zhangsan","lisi","wangwu"}};

String[][] names = new String[][]{{"tom","jack","mike"},{"zhangsan","lisi","wangwu"}};

如果定义了数组大小，那就应该用下标赋值