public interface MyInterface { default String def() { return "[" + toString() + ", " + "def]"; } default String join(MyInterface other) { return def() + other.def(); } } class C implements MyInterface{} compiles to: public class testpackage.MyClass implements testpackage.MyInterface { public testpackage.MyClass(); Code: 0: aload_0 1: invokespecial luontola#16 // Method java/lang/Object."<init>":()V 4: return public java.lang.String join(testpackage.MyInterface); Code: 0: aload_0 1: aload_1 2: invokestatic luontola#46 // Method testpackage/MyInterfacehelper.join:(Ltestpackage/MyInterface;Ltestpackage/MyInterface;)Ljava/lang/String; 5: areturn public java.lang.String def(); Code: 0: aload_0 1: invokestatic luontola#49 // Method testpackage/MyInterfacehelper.def:(Ltestpackage/MyInterface;)Ljava/lang/String; 4: areturn } Where testpackage.MyInterfacehelper is compiled to public class testpackage.MyInterfacehelper { private testpackage.MyInterfacehelper(); Code: 0: aload_0 1: invokespecial luontola#9 // Method java/lang/Object."<init>":()V 4: return public static java.lang.String def(testpackage.MyInterface); Code: 0: new luontola#13 // class java/lang/StringBuilder 3: dup 4: invokespecial luontola#14 // Method java/lang/StringBuilder."<init>":()V 7: ldc luontola#16 // String [ 9: invokevirtual luontola#20 // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder; 12: aload_0 13: invokevirtual luontola#24 // Method java/lang/Object.toString:()Ljava/lang/String; 16: invokevirtual luontola#20 // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder; 19: ldc luontola#26 // String , 21: invokevirtual luontola#20 // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder; 24: ldc luontola#28 // String def] 26: invokevirtual luontola#20 // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder; 29: invokevirtual luontola#29 // Method java/lang/StringBuilder.toString:()Ljava/lang/String; 32: areturn public static java.lang.String join(testpackage.MyInterface, testpackage.MyInterface); Code: 0: new luontola#13 // class java/lang/StringBuilder 3: dup 4: invokespecial luontola#14 // Method java/lang/StringBuilder."<init>":()V 7: aload_0 8: invokeinterface luontola#35, 1 // InterfaceMethod testpackage/MyInterface.def:()Ljava/lang/String; 13: invokevirtual luontola#20 // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder; 16: aload_1 17: invokeinterface luontola#35, 1 // InterfaceMethod testpackage/MyInterface.def:()Ljava/lang/String; 22: invokevirtual luontola#20 // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder; 25: invokevirtual luontola#29 // Method java/lang/StringBuilder.toString:()Ljava/lang/String; 28: areturn } ============== interface StaticTest { static <T> T staticMethod(T t) { return t; } } compiles to public class testpackage.StaticTesthelper { private testpackage.StaticTesthelper(); Code: 0: aload_0 1: invokespecial luontola#9 // Method java/lang/Object."<init>":()V 4: return public static <T> T staticMethod$static(T); Code: 0: aload_0 1: areturn } ======== Brigde methods are generated properly in example: public interface BridgeParent<T> { T get(); } public interface StringBridges extends BridgeParent<String> { @OverRide default String get() { return "default method"; } default String concrete() { return "concrete"; } } public class testpackage.StringBridgeshelper SourceFile: "testpackage/StringBridges.java" minor version: 0 major version: 50 flags: ACC_PUBLIC, ACC_SUPER Constant pool: luontola#1 = Utf8 testpackage/StringBridgeshelper luontola#2 = Class luontola#1 // testpackage/StringBridgeshelper luontola#3 = Utf8 java/lang/Object luontola#4 = Class luontola#3 // java/lang/Object luontola#5 = Utf8 testpackage/StringBridges.java luontola#6 = Utf8 <init> luontola#7 = Utf8 ()V luontola#8 = NameAndType luontola#6:luontola#7 // "<init>":()V luontola#9 = Methodref luontola#4.luontola#8 // java/lang/Object."<init>":()V luontola#10 = Utf8 get luontola#11 = Utf8 (Ltestpackage/StringBridges;)Ljava/lang/String; luontola#12 = Utf8 default method luontola#13 = String luontola#12 // default method luontola#14 = Utf8 concrete luontola#15 = String luontola#14 // concrete luontola#16 = Utf8 (Ltestpackage/StringBridges;)Ljava/lang/Object; luontola#17 = Utf8 testpackage/StringBridges luontola#18 = Class luontola#17 // testpackage/StringBridges luontola#19 = Utf8 ()Ljava/lang/String; luontola#20 = NameAndType luontola#10:luontola#19 // get:()Ljava/lang/String; luontola#21 = InterfaceMethodref luontola#18.luontola#20 // testpackage/StringBridges.get:()Ljava/lang/String; luontola#22 = Utf8 Code luontola#23 = Utf8 LineNumberTable luontola#24 = Utf8 SourceFile { private testpackage.StringBridgeshelper(); descriptor: ()V flags: ACC_PRIVATE Code: stack=1, locals=1, args_size=1 0: aload_0 1: invokespecial luontola#9 // Method java/lang/Object."<init>":()V 4: return public static java.lang.String get(testpackage.StringBridges); descriptor: (Ltestpackage/StringBridges;)Ljava/lang/String; flags: ACC_PUBLIC, ACC_STATIC Code: stack=1, locals=1, args_size=1 0: ldc luontola#13 // String default method 2: areturn LineNumberTable: line 9: 0 public static java.lang.String concrete(testpackage.StringBridges); descriptor: (Ltestpackage/StringBridges;)Ljava/lang/String; flags: ACC_PUBLIC, ACC_STATIC Code: stack=1, locals=1, args_size=1 0: ldc luontola#15 // String concrete 2: areturn LineNumberTable: line 13: 0 public static java.lang.Object get(testpackage.StringBridges); descriptor: (Ltestpackage/StringBridges;)Ljava/lang/Object; flags: ACC_PUBLIC, ACC_STATIC, ACC_BRIDGE, ACC_SYNTHETIC Code: stack=1, locals=1, args_size=1 0: aload_0 1: invokeinterface luontola#21, 1 // InterfaceMethod testpackage/StringBridges.get:()Ljava/lang/String; 6: areturn LineNumberTable: line 6: 0 }

Add progress dialog so create message task #9

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