最好是在变量上调用方法或将其链接到构造函数? [英] Is it better to call a method on a variable or chain it to the constructor?
问题描述
在任何类上都有调用此类方法的示例.
There are examples of calling such methods on any class.
即:
SampleClass sc=new SampleClass();
sc.someMethod();
还是最好使用
new SampleClass().someMethod();
请详细解释.
推荐答案
两个选项都一样,但是第一个选项更好...
Both options are as good, but first one is better...
如果您使用
SampleClass sc=new SampleClass();
sc.someMethod();
您可以使用类的相同对象来调用该类的其他方法.
You can call other methods of this class using same object of class.
如果您使用
new SampleClass().someMethod();
您需要另一个对象来调用此类的其他方法.
You require another object to call other method of this class.
其他示例是
loop { // Here loop can be any type, for/while/do-while
new SampleClass().someMethod();
}
这将创建循环执行多次的相同类的对象.但是,如果您选择第一个选项
this will create objects of same class as many times your loop execute. But if you go with first option
SampleClass sc=new SampleClass();
loop { // Here loop can be any type, for/while/do-while
sc.someMethod();
}
这不会导致创建许多对象来调用方法.
This will not cause to create many objects to call method.
但是,是的,如果您只需要调用一个方法而又没有进入循环,则可以使用new SampleClass().someMethod();
But Yes, if your need is to call only one method and that is not into loop, you can go with new SampleClass().someMethod();
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