Java Vector clear()
Java Vector 类的
clear()方法用于删除所有
语法:
以下是
clear()方法的声明:
参数:
此方法不接受任何参数。
返回:
此方法具有返回类型为void，因此它不返回任何值。
例外:
NA
兼容性版本:
Java 1.2及更高版本
示例1:
import java.util.Vector;
public class VectorClearExample1 {
public static void main(String arg[]) {
//Create an empty Vector
Vector<String> vc = new Vector<>();
//Add elements in the vector by using add() method
vc.add("A");
vc.add("B");
vc.add("C");
//Print the size of vector
System.out.println("Size of Vector before clear() method: "+vc.size());
//Clear the vector
vc.clear();
System.out.println("Size of Vector after clear() method: "+vc.size());
}
}
输出:
Size of Vector before clear() method: 3
Size of Vector after clear() method: 0
示例2:
import java.util.Vector;
public class VectorClearExample2 {
public static void main(String arg[]) {
//Create an empty Vector with initial capacity of 5
Vector<Integer> vecObject = new Vector<Integer>(5);
//Add values in the vector
vecObject.add(3);
vecObject.add(5);
vecObject.add(2);
vecObject.add(4);
vecObject.add(1);
System.out.println("Elements of Vector is: "+vecObject);
//Clear vector
vecObject.clear();
System.out.println("Elements of Vector after clear(): "+vecObject);
}
}
输出:
Elements of Vector is: [3, 5, 2, 4, 1]
Elements of Vector after clear(): []
