戻り値型だけが違うメソッドをJVM上で呼び分ける

console.txt

C:\Users\Mizushima>type DifferentReturnTypes.j
.class public DifferentReturnTypes
.super java/lang/Object

;
; standard initializer
.method public <init>()V
   aload_0

   invokenonvirtual java/lang/Object/<init>()V
   return
.end method

.method public static foo()I
   .limit stack 1
   bipush 1
   ireturn
.end method

.method public static foo()Ljava/lang/String;
   .limit stack 1
   ldc "Hello"
   areturn
.end method

.method public static main([Ljava/lang/String;)V
   .limit stack 2
   .limit locals 2

   getstatic java/lang/System/out Ljava/io/PrintStream;
   invokestatic DifferentReturnTypes/foo()I
   invokevirtual java/io/PrintStream/println(I)V

   getstatic java/lang/System/out Ljava/io/PrintStream;
   invokestatic DifferentReturnTypes/foo()Ljava/lang/String;
   invokevirtual java/io/PrintStream/println(Ljava/lang/String;)V

   return
.end method

C:\Users\Mizushima>java -jar c:\dev\jasmin-2.4\\jasmin.jar DifferentReturnTypes.j
Generated: DifferentReturnTypes.class

C:\Users\Mizushima>java DifferentReturnTypes
1
Hello

DifferentReturnTypes.j

.class public DifferentReturnTypes
.super java/lang/Object

;
; standard initializer
.method public <init>()V
   aload_0
 
   invokenonvirtual java/lang/Object/<init>()V
   return
.end method

; public static int foo()
.method public static foo()I
   .limit stack 1
   bipush 1
   ireturn
.end method

; public static String foo()
.method public static foo()Ljava/lang/String;
   .limit stack 1
   ldc "Hello"
   areturn
.end method

.method public static main([Ljava/lang/String;)V
   .limit stack 2
   .limit locals 2

   getstatic java/lang/System/out Ljava/io/PrintStream;
   invokestatic DifferentReturnTypes/foo()I
   invokevirtual java/io/PrintStream/println(I)V   

   getstatic java/lang/System/out Ljava/io/PrintStream;
   invokestatic DifferentReturnTypes/foo()Ljava/lang/String;
   invokevirtual java/io/PrintStream/println(Ljava/lang/String;)V   

   return
.end method