LinkedHashMap类的clear()方法 (LinkedHashMap 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 remove all the existing elements from this LinkedHashMap.

  clear()方法用于从此LinkedHashMap中删除所有现有元素。

• 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 clearing this LinkedHashMap.

  在清除此LinkedHashMap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 LinkedHashMap 
import java.util.*;
public class ClearOfLinkedHashMap {
public static void main(String[] args) {
// Instantiates a LinkedHashMap object
Map < Integer, String > map = new LinkedHashMap < Integer, String > ();
// By using put() method is to add
// key-value pairs in a LinkedHashMap
map.put(10, "C");
map.put(20, "C++");
map.put(50, "JAVA");
map.put(40, "PHP");
map.put(30, "SFDC");
// Display LinkedHashMap
System.out.println("LinkedHashMap: " + map);
// By using clear() method is
// to remove the mappings exists
// in this LinkedHashMap
map.clear();
System.out.print("map.clear(): ");
System.out.println(map);
}
}

Output

输出量

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

翻译自: https://www.includehelp.com/java/linkedhashmap-clear-method-with-example.aspx