treeset比較器

TreeSet類的compare()方法 (TreeSet 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 get the Comparator object based on customizing order the elements in this TreeSet.

  比較器()方法用于基于自定義此TreeSet中元素的順序來獲取Comparator對象。

• 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()方法是一種非靜態方法，只能通過類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

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

  返回Comparator對象時，compareor ()方法不會引發異常。

Syntax:

句法：

    public Comparator comparator();

Parameter(s):

參數：

• It does not accept any parameter.

  它不接受任何參數。

Return value:

返回值：

The return type of the method is Comparator, it gets Comparator based on defining the order of elements in this TreeSet otherwise it returns null when this TreeSet follows defalult ordering its elements.

方法的返回類型為Comparator ，它基于定義此TreeSet中元素的順序來獲取Comparator，否則，當此TreeSet遵循默認元素順序時，它返回null。

Example:

例：

// Java program to demonstrate the example 
// of Comparator comparator() method of TreeSet 
import java.util.*;
public class ComparatorOfTreeSet {
public static void main(String[] args) {
// Instantiates a TreeSet object
TreeSet < String > tree_set = new TreeSet < String > ();
// By using add() method is to add
// the given object of this TreeSet 
tree_set.add("C");
tree_set.add("C++");
tree_set.add("JAVA");
tree_set.add("PHP");
tree_set.add("SFDC");
// Display TreeSet
System.out.println("TreeSet: " + tree_set);
// By using comparator() method is to return
// the Comparator 
Comparator com = tree_set.comparator();
// Display Comparator
System.out.println("tree_set.comparator(): " + com);
}
}

Output

輸出量

TreeSet: [C, C++, JAVA, PHP, SFDC]
tree_set.comparator(): null

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

treeset比較器