JAVA 使用三元运算符调用方法
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JAVA calling a method using a ternary operator
提问by Trae Moore
I am trying to use ? to decide which method i want to call, but i do not need to assign a variable. My question: Is there a way to use the ternary operator with out assigning a variable?
我正在尝试使用 ? 决定我想调用哪个方法，但我不需要分配变量。我的问题：有没有办法在不分配变量的情况下使用三元运算符？
(something i dont need) = (x == 1)? doThisMethod():doThatMethod()
instead of
代替
if(x == 1) {
doThisMethod()
} else {
doThatMethod()
}
回答by Kevin DiTraglia
This will not work, as it is not the intended use of the ternary operator.
这将不起作用，因为它不是三元运算符的预期用途。
If you really want it to be 1 line, you can write:
如果你真的希望它是 1 行，你可以写：
if (x==1) doThisMethod(); else doThatMethod();
回答by Lukas Eder
I doubt that this works. The JLS §15.25defines the ternary expression as follows:
我怀疑这是否有效。所述JLS§15.25定义三元表达如下：
ConditionalExpression:
ConditionalOrExpression
ConditionalOrExpression ? Expression : ConditionalExpression
And a ConditionalExpressionisn't a Statementby itself. It can be used in various other places, though, e.g. an Assignment:
而且 a本身ConditionalExpression并不是 a Statement。但是，它可以在其他各种地方使用，例如Assignment：
AssignmentExpression:
ConditionalExpression
Assignment
Assignment:
LeftHandSide AssignmentOperator AssignmentExpression
回答by ruakh
According to §14.8 "Expression Statements" of the Java Language Specification, the only expressions that can be used alone as statements are:
根据Java Language Specification 的§14.8 "Expression Statements"，唯一可以单独用作语句的表达式是：
- assignments
- pre– and post-increments and pre– and post-decrements
- method calls
- class instance creation expressions (constructor calls)
- 作业
- 前后递增和前后递减
- 方法调用
- 类实例创建表达式（构造函数调用）
回答by Mightian
Much more diversified, if the flow was to break after the method call.this can be used, but a word of caution if the flow does not break after the if then both methods will get executed.
更加多样化，如果流程在方法调用后中断。这可以使用，但是如果流程在 if 之后没有中断，那么两个方法都将被执行。
if (x==1)
doThisMethod();
doThatMethod();
