Java构造函数 [英] java constructor

问题描述

为什么Java不支持c ++中的默认参数构造函数?

why java does not support default argument constructors as in c++?

推荐答案

以便您有理由使用C ++?

So that you can have a reason to use C++?

有点麻烦，但是您可以通过多个构造函数实现相同的效果:

C ++

It''s a bit more long-winded, but you can achieve the same effect with multiple constructors:

C++

thing(int required, int optional = 3) {
  field1 = required;
  field2 = optional;
}

Java

Java

thing(int required, int optional) {
  field1 = required;
  field2 = optional;
}
thing(int required) {
  this(required, 3);
}

[第二种形式也适用于C ++！]

彼得
投票，并根据需要将其标记为接受.

[This second form works in C++ too!]

Peter
Vote for answers, and mark them accepted if you like them.

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