Java 中的向量保证能力()方法，示例
原文:https://www . geesforgeks . org/vector-ensurecapacity-method-in-Java-with-example/
Java.util.Vector 类的 ensureCapacity() 方法增加了这个 Vector 实例的容量(如果需要的话)，以确保它至少可以容纳最小容量参数指定的元素数量。
语法:
public void ensureCapacity(int minCapacity)
参数:该方法以期望最小容量为参数。
以下是说明保证能力()方法的例子。
例 1:
// Java program to demonstrate
// ensureCapacity() method for Integer value
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
try {
// Creating object of Vector<Integer>
Vector<Integer>
vector = new Vector<Integer>();
// adding element to vector
vector.add(10);
vector.add(20);
vector.add(30);
vector.add(40);
// Print the Vector
System.out.println("Vector: "
+ vector);
// ensure that the Vector
// can hold upto 5000 elements
// using ensureCapacity() method
vector.ensureCapacity(5000);
// Print
System.out.println("Vector can now"
+ " surely store upto"
+ " 5000 elements.");
}
catch (Exception e) {
System.out.println(e);
}
}
}
Output:
Vector: [10, 20, 30, 40]
Vector can now surely store upto 5000 elements.
例 2:
// Java program to demonstrate
// ensureCapacity() method for String value
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
try {
// Creating object of Vector<Integer>
Vector<String>
vector = new Vector<String>();
// adding element to vector
vector.add("A");
vector.add("B");
vector.add("C");
vector.add("D");
// Print the Vector
System.out.println("Vector: "
+ vector);
// ensure that the Vector
// can hold upto 400 elements
// using ensureCapacity() method
vector.ensureCapacity(400);
// Print
System.out.println("Vector can now"
+ " surely store upto"
+ " 400 elements.");
}
catch (Exception e) {
System.out.println(e);
}
}
}
Output:
Vector: [A, B, C, D]
Vector can now surely store upto 400 elements.
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