我希望能够创建一个函数,例如:
class A {私人字符串 extraVar;public String myFormat(String format, Object ... args){返回 String.format(format, extraVar, args);}}这里的问题是 args 在方法 myFormat 中被视为 Object[],因此是 的单个参数>String.format,而我希望 args 中的每个 Object 都作为新参数传递.由于 String.format 也是一个带有可变参数的方法,所以这应该是可能的.
如果这是不可能的,是否有类似 String.format(String format, Object[] args) 的方法?在这种情况下,我可以使用新数组将 extraVar 前置到 args 并将其传递给该方法.
解决方案可变参数的基础类型
a> 方法 function(Object... args) is function(Object[] args).Sun 以这种方式添加了可变参数以保持向后兼容性.
所以你应该能够在 extraVar 前面加上 args 并调用 String.format(format, args).
I'd like to be able to create a function like:
class A { private String extraVar; public String myFormat(String format, Object ... args){ return String.format(format, extraVar, args); } }The problem here is that args is treated as Object[] in the method myFormat, and thus is a single argument to String.format, while I'd like every single Object in args to be passed as a new argument. Since String.format is also a method with variable arguments, this should be possible.
If this is not possible, is there a method like String.format(String format, Object[] args)? In that case I could prepend extraVar to args using a new array and pass it to that method.
解决方案The underlying type of a variadic method function(Object... args) is function(Object[] args). Sun added varargs in this manner to preserve backwards compatibility.
So you should just be able to prepend extraVar to args and call String.format(format, args).
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