Java Vector capacity() 方法

2025年3月24日 | 阅读时间：2 分钟

Java Vector 类的 capacity() 方法用于获取当前正在使用的向量的容量。

语法

以下是 capacity() 方法的声明：

参数

此方法不接受任何参数。

返回值

此方法返回当前正在使用的向量的容量。

异常

不适用

兼容版本

Java 1.2 及以上版本

示例 1

import java.util.Vector;
public class VectorCapacityExample1 {  
	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("Current capacity of Vector is: "+vecObject.capacity());	      
            }
}

输出

Current capacity of Vector is: 5

示例 2

import java.util.Vector;
public class VectorCapacityExample2 {  
	public static void main(String arg[]) {
		//Create an empty Vector with an initial capacity of 3      
	      Vector<String> vc = new Vector<>(3);
	      //Add elements in the vector
	      vc.add("A");
	      vc.add("B");
	      vc.add("C");	      
	      //Print all the elements of a Vector
	      System.out.println("Elements of Vector are: "+vc); 	      
	      System.out.println("Current capacity of Vector: "+vc.capacity());
	      //Add new element
	      vc.add("JavaTpoint");
	      //After addition, print all the elements again 
	      System.out.println("Elements after addition: "+vc); 	      
	      System.out.println("Current capacity of Vector after modification: "+vc.capacity());
            }
}

输出

Elements of Vector are: [A, B, C]
Current capacity of Vector: 3
Elements after addition: [A, B, C, JavaTpoint]
Current capacity of Vector after modification: 6

示例 3

import java.util.Vector;
public class VectorCapacityExample3 {  
	public static void main(String arg[]) {
		//Create an empty Vector    
	      Vector<String> vc = new Vector<>();
	      //Add elements in the vector
	      vc.add("A");
	      vc.add("B");
	      vc.add("C");	      	      
	      System.out.println("Default capacity of Vector: "+vc.capacity());
            }
}

输出

Default capacity of Vector: 10

下一主题Java Vector

Java Vector capacity() 方法

语法

参数

返回值

异常

兼容版本

示例 1

示例 2

示例 3

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Java Vector capacity() 方法

语法

参数

返回值

异常

兼容版本

示例 1

示例 2

示例 3

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