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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:全栈程序员栈长,转载请注明出处:https://javaforall.cn/128794.html原文链接:https://javaforall.cn