数组的the aggregate initialization和dynamic aggregate initialization

最新推荐文章于 2024-07-25 10:08:28 发布

转载最新推荐文章于 2024-07-25 10:08:28 发布 · 561 阅读

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#initialization #arrays #reference #null #class #object

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本文深入探讨了Java中数组的各种初始化方式，包括简单的数组声明、聚集初始化及动态聚集初始化等，并通过示例代码详细展示了每种初始化方法的具体用法。

class Weeble {} // A small mythical creature

public class ArraySize {
  private static Test monitor = new Test();
  public static void main(String[] args) {
    // Arrays of objects:
    Weeble[] a; // Local uninitialized variable
    Weeble[] b = new Weeble[5]; // Null references
    Weeble[] c = new Weeble[4];
    for(int i = 0; i < c.length; i++)
      if(c[i] == null) // Can test for null reference
        c[i] = new Weeble();
    // Aggregate initialization:
    Weeble[] d = {
      new Weeble(), new Weeble(), new Weeble()
    };
    // Dynamic aggregate initialization:
    a = new Weeble[] {
      new Weeble(), new Weeble()
    };
  }
}

聚集初始化数组 ——》如：int[ ] dots = {6,4,8}; // 声明、构建、初始化在一条语句中进行

The aggregate initialization must be used at the point of definition

动态聚集初始化数组（匿名数组） ——》如：new int[ ]{6,4,8}; // 构建、初始化在一条语句中进行

The next array initialization can be thought of as a "dynamic aggregate initialization."

W ith this syntax you can create and initialize an array object anywhere.