以下是一个示例代码，用于遍历一个包含数组的数组，并显示 playerId、playerName 和 playerCategory：

// 定义一个包含数组的数组
String[][] players = {
    { "1", "Player1", "Category1" },
    { "2", "Player2", "Category2" },
    { "3", "Player3", "Category3" }
};

// 遍历数组
for (int i = 0; i < players.length; i++) {
    String playerId = players[i][0];
    String playerName = players[i][1];
    String playerCategory = players[i][2];
    System.out.println("playerId: " + playerId);
    System.out.println("playerName: " + playerName);
    System.out.println("playerCategory: " + playerCategory);
}

输出结果为：

playerId: 1
playerName: Player1
playerCategory: Category1
playerId: 2
playerName: Player2
playerCategory: Category2
playerId: 3
playerName: Player3
playerCategory: Category3

这段示例代码会遍历数组，逐个获取每个元素的 playerId、playerName 和 playerCategory，并将其打印输出。