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23 
24 /**
25  * @test
26  * @bug 8003280
27  * @summary Add lambda tests
28  *   Test constructor reference
29  * @compile MethodRef4.java
30  * @run main MethodRef4
31  */
32 
33 public class MethodRef4 {
34 
m()35     static interface A {Fee<String> m();}
36 
m(String s)37     static interface B {Fee<String> m(String s);}
38 
m()39     static interface C {Object m();}
40 
41     static class Fee<T> {
42 
43         private T t;
44 
Fee()45         public Fee() {
46             System.out.println("Fee<T> instantiated");
47         }
48 
Fee(T t)49         public Fee(T t) {
50             this.t = t;
51             System.out.println("Fee<T> instantiated: " + t);
52         }
53 
make()54         public void make() {
55             System.out.println(this + ": make()");
56         }
57     }
58 
assertTrue(boolean cond)59     private static void assertTrue(boolean cond) {
60         if (!cond)
61             throw new AssertionError();
62     }
63 
main(String[] args)64     public static void main(String[] args) {
65 
66         A a = Fee<String>::new; //constructor reference to Fee<T>()
67         a.m().make();
68 
69         B b = Fee<String>::new; //constructor reference to Fee<T>(String)
70         b.m("hi").make();
71 
72         C c = MethodRef4::new; //constructor reference to MethodRef4()
73         assertTrue( c.m() instanceof MethodRef4 );
74         c = MethodRef4::new; //constructor reference to MethodRef4()
75         assertTrue( c.m() instanceof MethodRef4 );
76         c = Fee<String>::new; //constructor reference to Fee<T>()
77         assertTrue( c.m() instanceof Fee );
78     }
79 }
80