本文关键词：Java 8， 函数式接口，lambda 。
介绍
全路径: java.util.function.Supplier 。
Java 8 中引入。
源码：
package java.util.function;
/**
* Represents a supplier of results.
*
* <p>There is no requirement that a new or distinct result be returned each
* time the supplier is invoked.
*
* <p>This is a <a href="package-summary.html">functional interface</a>
* whose functional method is {@link #get()}.
*
* @param <T> the type of results supplied by this supplier
*
* @since 1.8
*/
@FunctionalInterface
public interface Supplier<T> {
/**
* Gets a result.
*
* @return a result
*/
T get();
}
示例
代码示例：
import java.util.function.Supplier;
public class Main {
public static void main(String[] args) {
Supplier<Long> supplier = () -> {
return System.currentTimeMillis() + 1;
};
System.out.println(supplier.get());
}
}