在Kotlin中实例化对象时如何覆盖方法? [英] How to override method when instantiating object in Kotlin?

问题描述

在Java中，我们可以在实例化新对象时覆盖方法

In Java, to override method when instantiating new object we can do this

public ActivityTestRule<MainActivity> rule = new ActivityTestRule<MainActivity>(
            MainActivity.class) {
        @Override
        protected void beforeActivityLaunched() {
            // implement code
            super.beforeActivityLaunched();
        }
    };

如何在Kotlin中做到这一点?我尝试了这段代码，但无法编译.

How to do that in Kotlin? I tried this code but it failed to compile.

@Rule @JvmField
var rule = ActivityTestRule<MainActivity>(MainActivity::class.java) {
    override fun beforeActivityLaunched() {
        super.beforeActivityLaunched()
    }
} 

推荐答案

如果要创建匿名内部类，则应使用object.

If you want to create anonymous inner class, you should use object.

var rule = object : ActivityTestRule<MainActivity>(MainActivity::class.java) {
    override fun beforeActivityLaunched() {
        super.beforeActivityLaunched()
    }
}

另请参见对象表达式和声明.

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