Java 中的向量清零()方法
原文:https://www.geeksforgeeks.org/vector-clear-method-in-java/
方法用于从向量中移除所有元素。使用 clear()方法只会清除向量中的所有元素，而不会删除向量。换句话说，我们可以说 clear()方法仅用于清空现有向量。
语法:
Vector.clear()
参数:该方法不取任何参数
返回值:函数不返回值。
下面的程序说明了 Java.util.Vector.clear()方法。
例 1:
// Java code to illustrate clear()
import java.util.*;
public class GFG {
public static void main(String args[])
{
// Creating an empty Vector
Vector<String> vt = new Vector<String>();
// Use add() method to add elements into the Vector
vt.add("Welcome");
vt.add("To");
vt.add("Geeks");
vt.add("4");
vt.add("Geeks");
// Displaying the Vector
System.out.println("Vector: " + vt);
// Clearing the Vector using clear() method
vt.clear();
// Displaying the final vector after clearing;
System.out.println("The final Vector: " + vt);
}
}
Output:
Vector: [Welcome, To, Geeks, 4, Geeks]
The final Vector: []
例 2:
// Java code to illustrate clear()
import java.util.*;
public class GFG {
public static void main(String args[])
{
// Creating an empty Vector
Vector<Integer> vt = new Vector<Integer>();
// Use add() method to add elements into the Queue
vt.add(10);
vt.add(15);
vt.add(30);
vt.add(20);
vt.add(5);
// Displaying the Vector
System.out.println("Vector: " + vt);
// Clearing the Vector using clear() method
vt.clear();
// Displaying the final vector after clearing;
System.out.println("The final Vector: " + vt);
}
}
Output:
Vector: [10, 15, 30, 20, 5]
The final Vector: []
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