java treemap

TreeMap類的lastEntry()方法 (TreeMap Class lastEntry() method)

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

  lastEntry()方法在java.util包中可用。

• lastEntry() method is used to return the entry (key-value pairs) that exists with the largest key element value in this TreeMap.

  lastEntry()方法用于返回此TreeMap中具有最大鍵值的條目(鍵值對)。

• lastEntry() 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.

  lastEntry()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。

• lastEntry() method does not throw an exception at the time of returning last entry.

  返回最后一個條目時， lastEntry()方法不會引發異常。

Syntax:

句法：

    public Map.Entry lastEntry();

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 Map.Entry, it returns those key-value pairs with the greatest key element value otherwise it returns null.

方法的返回類型為Map.Entry ，它返回鍵值最大的那些鍵值對，否則返回null。

Example:

例：

// Java program to demonstrate the example 
// of Map.Entry lastEntry() method of TreeMap 
import java.util.*;
public class LastEntryOfTreeMap {
public static void main(String[] args) {
// Instantiates TreeMap
TreeMap < Integer, String > tm = new TreeMap < Integer, String > ();
// By using put() method is
// to put the key-value pairs in
// treemap tm
tm.put(1, "C");
tm.put(4, "C++");
tm.put(3, "Java");
tm.put(2, "Php");
// Display TreeMap tm
System.out.println("tm: " + tm);
// By using lastEntry() method is
// used to return the key-value pairs
// linked with the largest key element 
// value i.e. 4
// Display Returned Key-Value Element
System.out.println("tm.lastEntry(): " + tm.lastEntry());
}
}

Output

輸出量

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

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

java treemap