treeset java

TreeSet類的first()方法 (TreeSet Class first() method)

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

  first()方法在java.util包中可用。

• first() method is used to retrieve the first lowest element in this TreeSet.

  first()方法用于檢索此TreeSet中的第一個最低元素。

• first() 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.

  first()方法是一個非靜態方法，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。

• first() method may throw an exception at the time of returning the first least object in this TreeSet.

  返回此TreeSet中的第一個最小對象時， first()方法可能會引發異常。

  NoSuchElementException – This exception may throw when this TreeSet is “blank”.

  NoSuchElementException-如果此TreeSet為“空白”，則可能引發此異常。

Syntax:

句法：

public Element first();

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 Element, it gets the first least element exists in this TreeSet.

方法的返回類型為Element ，它獲取此TreeSet中存在的第一個最小元素。

Example:

例：

// Java program to demonstrate the example // of Element first() method of TreeSet import java.util.*;public class FirstOfTreeSet {public static void main(String[] args) {// Instantiates a TreeSet objectTreeSet < 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 TreeSetSystem.out.println("TreeSet: " + tree_set);// By using first() method is to return// the first least element exists in this TreeSetObject first_least = tree_set.first();// Display first_leastSystem.out.println("tree_set.first(): " + first_least);} }

Output

輸出量

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

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

treeset java

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