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描述:一元运算,接受一个T类型参数,输出一个与入参一模一样的值
源码:
public interface UnaryOperator<T> extends Function<T, T> {
/** * Returns a unary operator that always returns its input argument. * * @param <T> the type of the input and output of the operator * @return a unary operator that always returns its input argument */
static <T> UnaryOperator<T> identity() {
return t -> t;
}
}
测试代码:
@Test
public void test(){
super.print(UnaryOperator.identity().apply(1));//输出1
super.print(UnaryOperator.identity().apply(false));//输出false
super.print(UnaryOperator.identity().apply("string"));//输出string
}
发布者:全栈程序员-站长,转载请注明出处:https://javaforall.net/128794.html原文链接:https://javaforall.net