Java example source code file (BadReturn.java)

This example Java source code file (BadReturn.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

badreturn, comparable, sam

The BadReturn.java Java example source code

/*
 * @test /nodynamiccopyright/
 * @bug 8003280
 * @summary Add lambda tests
 *  check that incompatible return types in lambdas are flagged with error
 * @author  Maurizio Cimadamore
 * @compile/fail/ref=BadReturn.out -XDrawDiagnostics BadReturn.java
 */

class BadReturn {

    interface SAM {
        Comparable<?> m();
    }

    static void testNeg1() {
        SAM s = ()-> {
            if (true) {
                return "";
            } else {
                return System.out.println("");
            }};
    }

    static void testNeg2() {
        SAM s = ()-> { return System.out.println(""); };
    }

    static void testPos() {
        SAM s = ()-> {
            if (false) {
                return 10;
            }
            else {
                return true;
            }};
    }
}