java treemap

TreeMap类clear()方法 (TreeMap Class clear() method)

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

  clear()方法在java.util包中可用。

• clear() method is used to clear all of the existing mappings from this TreeMap.

  clear()方法用于清除此TreeMap中的所有现有映射。

• clear() 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.

  clear()方法是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• clear() method does not throw an exception at the time of removing objects from this TreeMap.

  从此TreeMap中删除对象时， clear()方法不会引发异常。

Syntax:

句法：

public void clear();

Parameter(s):

参数：

• It does not accept any parameter.

  它不接受任何参数。

Return value:

返回值：

The return type of the method is void, it returns nothing.

该方法的返回类型为void ，不返回任何内容。

Example:

例：

// Java program to demonstrate the example // of void clear() method of TreeMap import java.util.*;public class ClearOfTreeMap {
       public static void main(String[] args) {
           // Instantiates a TreeMap object        NavigableMap < Integer, String > tree_map = new TreeMap < Integer, String > ();        // By using put() method is to add        //key-value pairs in a TreeMap        tree_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 clear() method is        // to remove the mappings in this TreeMap        tree_map.clear();        System.out.print("tree_map.clear(): ");        System.out.println(tree_map);    }}

Output

输出量

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

翻译自:

java treemap