C#中“ new”关键字的用途是什么？
使用new关键字创建数组的实例-
int [] a = new int[5];
new运算符用于创建对象或实例化对象。在此示例中，使用新的-为类创建对象-
示例
using System;
namespace CalculatorApplication {
class NumberManipulator {
public void swap(int x, int y) {
int temp;
temp = x; /* save the value of x */
x = y; /* put y into x */
y = temp; /* put temp into y */
}
static void Main(string[] args) {
NumberManipulator n = new NumberManipulator();
/* local variable definition */
int a = 100;
int b = 200;
Console.WriteLine("Before swap, value of a : {0}", a);
Console.WriteLine("Before swap, value of b : {0}", b);
/* calling a function to swap the values */
n.swap(a, b);
Console.WriteLine("After swap, value of a : {0}", a);
Console.WriteLine("After swap, value of b : {0}", b);
Console.ReadLine();
}
}
}输出结果
Before swap, value of a : 100 Before swap, value of b : 200 After swap, value of a : 100 After swap, value of b : 200