treemap比較器

TreeMap類的compare()方法 (TreeMap Class comparator() method)

• comparator() method is available in java.util package.

  比較器()方法在java.util包中可用。

• comparator() method is used to return the key element in this TreeMap based on the Comparator object otherwise it returns null when this TreeMap follows default ordering the key elements.

  比較器()方法用于根據(jù)Comparator對(duì)象返回此TreeMap中的關(guān)鍵元素，否則，當(dāng)此TreeMap遵循默認(rèn)的關(guān)鍵元素順序時(shí)，它將返回null。

• comparator() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  比較器()方法是一種非靜態(tài)方法，只能通過類對(duì)象訪問，如果嘗試使用類名稱訪問該方法，則會(huì)收到錯(cuò)誤消息。

• comparator() method does not throw an exception at the time of returning the Comparator object.

  返回Comparator對(duì)象時(shí)，compareor ()方法不會(huì)引發(fā)異常。

Syntax:

句法：

public Comparator comparator();

Parameter(s):

參數(shù)：

• It does not accept any parameter.

  它不接受任何參數(shù)。

Return value:

返回值：

The return type of the method is Comparator, it returns Comparator object will result in ordering the key element otherwise it returns null when this TreeMap will result in default ordering the key element.

該方法的返回類型為Comparator ，它返回Comparator對(duì)象將導(dǎo)致對(duì)key元素進(jìn)行排序，否則，當(dāng)此TreeMap導(dǎo)致對(duì)key元素進(jìn)行默認(rèn)排序時(shí)，它將返回null。

Example:

例：

// Java program to demonstrate the example // of Comparator comparator() method of TreeMap import java.util.*;public class ComparatorOfTreeMap {public static void main(String[] args) {// Instantiates a TreeMap objectNavigableMap < Integer, String > tree_map = new TreeMap < Integer, String > ();// By using put() method is to add// key-value pairs in a TreeMaptree_map.put(10, "C");tree_map.put(20, "C++");tree_map.put(50, "JAVA");tree_map.put(40, "PHP");tree_map.put(30, "SFDC");// Display TreeMap System.out.println("TreeMap: " + tree_map);// By using comparator() method is to// return the comparator objectComparator com = tree_map.comparator();// Display ComparatorSystem.out.println("tree_map.comparator(): " + com);} }

Output

輸出量

TreeMap: {10=C, 20=C++, 30=SFDC, 40=PHP, 50=JAVA} tree_map.comparator(): null

翻譯自: https://www.includehelp.com/java/treemap-comparator-method-with-example.aspx

treemap比較器

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