Java example source code file (VoidCompatibility.java)

This example Java source code file (VoidCompatibility.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

runnable, thunk, voidcompatibility

The VoidCompatibility.java Java example source code

/*
 * @test /nodynamiccopyright/
 * @bug 8003280
 * @summary Add lambda tests
 *  check that that void compatibility affects overloading as expected
 * @compile VoidCompatibility.java
 */
class VoidCompatibility {

    interface Runnable { void run(); } //1
    interface Thunk<T> { T get(); } //2

    void schedule(Runnable r) { }
    void schedule(Thunk<?> t) { }

    void test() {
        schedule(() -> System.setProperty("done", "true")); //non-void most specific
        schedule(() -> { System.setProperty("done", "true"); }); //1
        schedule(() -> { return System.setProperty("done", "true"); }); //2
        schedule(() -> System.out.println("done")); //1
        schedule(() -> { System.out.println("done"); }); //1
        schedule(Thread::yield); //1
        schedule(Thread::getAllStackTraces); //non-void most specific
        schedule(Thread::interrupted); //1 (most specific)
    }
}