java treemap

TreeMap類HigherKey()方法 (TreeMap Class higherKey() method)

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

  HigherKey()方法在java.util包中可用。

• higherKey() method is used to return the lowest key value element higher than the given key element (key_ele).

  HigherKey()方法用于返回比給定鍵元素(key_ele)高的最低鍵值元素。

• higherKey() 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.

  HigherKey()方法是一個非靜態方法，只能通過類對象訪問，如果嘗試使用類名訪問該方法，則會收到錯誤消息。

• higherKey() method may throw an exception at the time of returning an appropriate key element from this map.

  從該映射返回適當的鍵元素時， higherKey()方法可能會引發異常。

  • ClassCastException: This exception may throw when the given parameter is incompatible to compare with.ClassCastException ：當給定參數不兼容時，可能引發此異常。
  • NullPointerException: This exception may throw when the given element is null exists.NullPointerException ：當給定元素為null時，可能引發此異常。

Syntax:

句法：

public Key higherKey(Key key_ele);

Parameter(s):

參數：

• Key key_ele – represents the key element to compare with.

  Key key_ele –表示要比較的關鍵元素。

Return value:

返回值：

The return type of the method is Key, it retrieves the lowest value key element that is higher than the given key element (key_ele) otherwise it returns null.

方法的返回類型為Key ，它檢索比給定鍵元素(key_ele)高的最低值鍵元素，否則返回null。

Example:

例：

// Java program to demonstrate the example // of Key higherKey(Key key_ele) // method of TreeMap import java.util.*;public class HigherKeyOfTreeMap {public static void main(String[] args) {// Instantiates TreeMapTreeMap < Integer, String > tm = new TreeMap < Integer, String > ();// By using put() method is// to put the key-value pairs in// treemap tmtm.put(1, "C");tm.put(4, "C++");tm.put(3, "Java");tm.put(2, "Php");// Display TreeMap tmSystem.out.println("tm: " + tm);// By using higherKey(3) method is// return the lowest key element // higher than the given key element i.e. 4// Display Returned Key ElementSystem.out.println("tm.higherKey(): " + tm.higherKey(3));} }

Output

輸出量

tm: {1=C, 2=Php, 3=Java, 4=C++} tm.higherKey(): 4

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

java treemap

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