java 中同一对象内的对象列表

Question

我有下一个情况：

public class Network {
   protected int mask;
   protected IPv4Address address;

   public Network(IPv4Address address, int maskLength) {
    blahblah
   }
   public mymethod() {
    Network[] privatnetworks = {new Network(new IPv4Address("10.0.0.0"), 8), new Network(new IPv4Address("172.16.0.0"), 12)}
}

在这里，每次我调用 mymethod 时，我都需要创建对我来说效率低下的对象列表。我可以以某种方式创建一次并将其用于我的所有方法吗？抱歉，如果这个问题简单或愚蠢 - 我是 java.

的新手

Answer 1

将变量定义为实例变量：

public class Network {
   protected int mask;
   protected IPv4Address address;
   Network[] privatnetworks = {new Network(new IPv4Address("10.0.0.0"), 8), new Network(new IPv4Address("172.16.0.0"), 12)}

   public Network(IPv4Address address, int maskLength) {
    blahblah
   }
   public mymethod() {
    }

Answer 2

使用这个：

public class Network {
   protected int mask;
   protected IPv4Address address;

   private static  Network[] privatnetworks = {new Network(new IPv4Address("10.0.0.0"), 8), new Network(new IPv4Address("172.16.0.0"), 12)}

   public Network(IPv4Address address, int maskLength) {
    blahblah
   }
   public mymethod() {

}

Answer 3

将Network设为static变量，只会初始化一次

static Network[] privatnetworks = {new Network(new IPv4Address("10.0.0.0"), 8), new Network(new IPv4Address("172.16.0.0"), 12)}

java 中同一对象内的对象列表

list of objects inside the same object in java

java

oop

methods