如何按内部数组的字段之一对多维数组排序?
How do I sort a multidimensional array by one of the fields of the inner array?
在Java中，如何创建这样的多维数组?以及如何按X字段对其进行排序?有例子吗?
In Java, How I can create a multidimensional array like this? and how I can sort it by X field? Any examples?
Array ( [0] => Array ( [name] => Sony TV [price] => 600.00 ) [1] => Array ( [name] => LG TV [price] => 350.00 ) [2] => Array ( [name] => Samsung TV [price] => 425.00 ) }推荐答案
您拥有的东西根本看起来并不像多维数组(嗯，它看起来像PHP多维数组，而不是Java多维数组)，而是对象数组，其中每个对象都有一个名称"和一个价格"字段.
What you have doesn't look like a multidimensional array at all (well, it looks like a PHP multidimensional array, but not a Java one), but rather an array of objects, where each object has a "name" and a "price" field.
在这种情况下，您应该首先创建对象的类.我们称之为Product:
In these case you should first create your object's class. Let's call it Product:
public class Product implements Comparable<Product> { private String name; private BigDecimal price; public Product(final String name, final BigDecimal price) { this.name = name; this.price = price; } @Override public int compareTo(final Product other) { return namepareTo(other.name); } /* Other methods. */ /* Getters and setters for price and name. */ }您会注意到该类实现了 ，并具有方法compareTo.这意味着可以订购产品的集合.然后，将Product放入数组中，并使用Arrays.sort()方法对其进行排序:
You'll notice that this class implements Comparable<Product> and has a method compareTo. This means that a collection of products can be ordered. Then, you put your Products into an array and you use the Arrays.sort() method to sort it:
Product[] products = new Product[3]; products[0] = new Product("Sony TV", new BigDecimal("600.00")); products[1] = new Product("LG TV", new BigDecimal("350.00")); products[2] = new Product("Samsung TV", new BigDecimal("425.00")); Arrays.sort(products);编辑:我错过了您想要按任何字段进行排序的事实.在这种情况下，您需要比较器.每个字段需要一个:
I missed the fact that you wanted to sort by any field. In this case, you need Comparators. You'll need one per field:
Comparator<Product> nameComparator = new Comparator<Product>() { @Override int compare(final Product p1, final Product p2) { return p1.getName()pareTo(p2.getName()); }; Comparator<Product> priceComparator = new Comparator<Product>() { @Override int compare(final Product p1, final Product p2) { return p1.getPrice()pareTo(p2.getPrice()); };然后，只需将您的比较器提供给Array.sort()方法:
Then, just give your comparators to the Array.sort() method:
Arrays.sort(products, nameComparator); /* or */ Arrays.sort(products, priceComparator);