如何创建String类副本？ [英] How to create a String class replica?

问题描述

我需要使用与 java.lang.String 完全相同的方法创建一个类。

I need to create a class with exactly the same methods as java.lang.String.

什么在Java中这是最好的方法吗？

What is the best way to do this in Java?

我知道我不能扩展String类，因为它是 final 。我不是在寻找需要复制 java.lang.String 源代码的解决方案。例如，假设我在我的自定义类 MyString 中需要功能 length（），它具有相应的' myLength（）`方法。

I know that I can't extend String class as it is final. I am not looking at solutions where I need to copy the source code of java.lang.String. For example, assume that I need the functionality length() within my custom class named MyString, which has a corresponding 'myLength()` method.

实现 myLength（）的最佳方式是什么？

What is the best way to implement myLength()?

我不是在寻找各种算法来找出字符串的长度，而是重用字符串的 length（）方法。现在，一旦我准备好 MyString 类，我就可以在任何地方使用它进行自定义操作。

I am not looking at various algorithms to find out the length of a string but to reuse String's length() method. Now once I have MyString class ready, I should be able to use it anywhere for my custom manipulations.

推荐答案

从您的问题来看，您所寻找的事情很简单委托：

From your question it sounds like the thing you are looking for is simple delegation:

class MyString {

  String delegate; // The actual string you delegate to from your class

  public MyString(String delegate) {
    this.delegate = delegate; // Assign the string that backs your class
  }

  int length() {
    return delegate.length(); // Delegate the method call to the string
  }

  // other methods that delegate to the string field
}

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