调用super() [英] Calling super()
本文介绍了调用super()的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
你什么时候用Java调用super()?
我在派生类的一些构造函数中看到它,但不是自动调用的每个父类的构造函数?为什么你需要使用超级?
When do you call super() in Java? I see it in some constructors of the derived class, but isn't the constructors for each of the parent class called automatically? Why would you need to use super?
推荐答案
如果你提供这样的课程:
If you provide a class like this:
public class Foo
{
}
或者这个:
public class Foo()
{
public Foo()
{
}
}
编译器将生成代码:
public class Foo()
{
public Foo()
{
super();
}
}
所以,严格来说,调用super( )总是在那里。
So, strictly speaking, the call to "super()" is always there.
在实践中,你应该只调用super(...),其中有你想传递给父构造函数的参数。
In practice you should only call "super(...)" where there are parameters you want to pass to the parent constructor.
调用super()(没有参数)没有错,但人们会嘲笑你: - )
It isn't wrong to call "super()" (with no parameters) but people will laugh at you :-)
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