Supplier.java

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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
 */
/*
 * 函数式接口：Supplier<T>
 *
 * 参数：无参数
 * 返回：T
 * 示例：用作工厂模式创建对象
 *       Supplier<ArrayList> f = ()->new ArrayList();
 */
@FunctionalInterface
public interface Supplier<T> {
    
    /**
     * Gets a result.
     *
     * @return a result
     */
    T get();
}