Java中AbstractSequentialList clear()方法的示例

Java中AbstractSequentialList的 clear()方法 用于从列表中移除所有元素。调用后该列表将为空。

Syntax:

public void clear()

Parameters: 该函数没有参数。

Returns: 该方法不返回任何值。它删除列表中的所有元素并使其为空。

以下示例说明了AbstractSequentialList.clear()方法：

示例1：

// Java code to demonstrate the working of
// clear() method in AbstractSequentialList

import java.util.*;

public class GFG {
    public static void main(String[] args)
    {
        // creating an AbstractSequentialList
        AbstractSequentialList arr
            = new LinkedList();

        // using add() to initialize values
        // [1, 2, 3, 4]
        arr.add(1);
        arr.add(2);
        arr.add(3);
        arr.add(4);

        // list initially
        System.out.println("The list initially: "
                                   + arr);

        // clear function used
        arr.clear();

        // list after clearing all elements
        System.out.println("The list after "
                                   + "using clear() method: "
                                   + arr);
    }
}

The list initially: [1, 2, 3, 4]
The list after using clear() method: []

示例2：

// Java code to demonstrate the working of
// clear() method in AbstractSequentialList

import java.util.*;

public class GFG {
    public static void main(String[] args)
    {
        // creating an AbstractSequentialList
        AbstractSequentialList arr
            = new LinkedList();

        // using add() to initialize values
        // [Geeks, For, ForGeeks, GeeksForGeeks]
        arr.add("Geeks");
        arr.add("For");
        arr.add("ForGeeks");
        arr.add("GeeksForGeeks");

        // list initially
        System.out.println("The list initially: "
                                   + arr);

        // clear function used
        arr.clear();

        // list after clearing all elements
        System.out.println("The list after "
                                   + "using clear() method: "
                                   + arr);
    }
}

The list initially: [Geeks, For, ForGeeks, GeeksForGeeks]
The list after using clear() method: []