对象的默认字符串化，相当于 Java 的 toString? [英] Default stringify for objects, equivalent to Java's toString?

问题描述

我刚刚看了 dart 的 3º 教程，创建了评级组件.我想知道是否有在字符串化对象时调用的相同方法，类似于 Java 的 toString.

I have just take a look at the 3º tutorial from dart, creating the rating component. I was wondering if there is same method which is called when stringifying an object, something similar to Java's toString.

例如:

MyClass myObject = new MyClass();
System.out.println(myObject);

如果被覆盖，将调用 MyClass.toString()，否则将调用它的父级，直到达到 java.lang.Object 并给出默认的 toString.

Will call MyClass.toString() if overwriten, else will call it's parent until java.lang.Object is reached giving a default toString.

我觉得有点丑(完全主观):

I find kind ugly (completely subjective) doing:

<span ng-repeat="star in cmp.stars" > {{star.toString()}} </span>

我宁愿这样做:

    <span ng-repeat="star in cmp.stars" > {{star}} </span>

并给出我希望它在一个 averwritten 方法中如何显示的实现.这可能吗?

And give the implementation of how I want it to display at an averwritten method. Is this possible?

推荐答案

是的，它适用于 print、字符串插值或 Angular mustaches.

Yes it works like this for print, String interpolation or Angular mustaches.

通过覆盖对象上的 String toString() 方法，显示的值将是此 toString() 调用的结果.如果在类层次结构中没有定义 toString()，Object 的 toString() 将被调用(它将返回 Instance of'MyClass' 用于 class MyClass{}).

By overriding the String toString() method on your object the displayed value will be the result of this toString() call. If there's no toString() defined in the class hierarchy the toString() of Object will be called (which will return Instance of 'MyClass' for class MyClass{}).

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