在Scala构造函数中捕获异常

Question

这个Java代码的Scala等价物是什么,在someMethodThatMightThrowException其他地方定义了什么？

class MyClass {
    String a;
    String b;

    MyClass() {
        try {
            this.a = someMethodThatMightThrowException();
            this.b = someMethodThatMightThrowException();
        } finally {
            System.out.println("Done");
        }
    }
}

Answer 1

class MyClass {
  private val (a, b) =
    try {
      (someMethodThatMightThrowException(),
       someMethodThatMightThrowException())
    } finally {
      println("Done")
    }
}

try是Scala中的表达式,因此您可以使用它的值.使用元组和模式匹配,您可以使用statement来获取多个值.

或者,您可以使用与Java中几乎相同的代码:

class MyClass {
  private var a: String = _
  private var b: String = _

  try {
    a = someMethodThatMightThrowException()
    b = someMethodThatMightThrowException()
  } finally {
    println("Done")
  }
}