treeset java

TreeSet类的clear()方法 (TreeSet 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 objects that exist from this TreeSet.

  clear()方法用于清除此TreeSet中存在的所有对象。

• 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 TreeSet.

  从此TreeSet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 TreeSet
import java.util.*;
public class ClearOfTreeSet {public static void main(String[] args) {// Instantiates a TreeSet object
TreeSet < 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 TreeSet
System.out.println("TreeSet: " + tree_set);
// By using clear() method is to
// remove all of the elements exists
// in this TreeSet
tree_set.clear();
// Display Modified TreeSet
System.out.println("tree_set.clear(): " + tree_set);
}
}

Output

输出量

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

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

treeset java