这是什么() ?它可以有多个参数吗? [英] what is this() ? can it have multiple parameters?

问题描述

我遇到一个代码，其中 java 中的 this() 方法接受三个参数，两个是整数，第三个是布尔值.这到底是什么意思呢 ?this() 方法还有其他变体吗?Hera 是实际代码.

I encountered a code where this() method in java takes three parameters two being integers and the third one is boolean value. what exactly does that mean ? Are there any other variants of this() method ? Hera is the actual code.

 public SegmentConstructor(int seqNum_, int length_) {
        this(seqNum_, length_, false);
    }

谢谢..

推荐答案

这意味着当前类中有另一个具有该签名的构造函数.

It means that there is another constructor in the current class that has that signature.

public SegmentConstructor(int seqNum_, int length_) {
    this(seqNum_, length_, false); // calls the constructor below.
}

public SegmentConstructor(int seqNum_, int length_, boolean required_) {
    seqNum = seqNum_;
    length = length_;
    required = required_;
}

this 方法只是从另一个构造函数中调用类的一个构造函数的一种方法，以帮助避免代码重复.它只能在构造函数的第一行调用——不能在任何其他方法中调用.

The this method is just a way to call one of your class's constructors from within another constructor, to help avoid code duplication. It can only be called on the first line of a constructor--never from within any other method.

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