https://www.graalvm.org/ 
class com.oracle.truffle.tools.profiler.impl.CPUSamplerCLI$1 implements java.util.function.Function<java.lang.String, com.oracle.truffle.tools.profiler.impl.CPUSamplerCLI$Output>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.tools.profiler.impl.CPUSamplerCLI$1
  super_class: java.lang.Object
{
  void <init>();
    descriptor: ()V
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.tools.profiler.impl.CPUSamplerCLI$1 this
         0: .line 62
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.oracle.truffle.tools.profiler.impl.CPUSamplerCLI$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/tools/profiler/impl/CPUSamplerCLI$1;

  public com.oracle.truffle.tools.profiler.impl.CPUSamplerCLI$Output apply(java.lang.String);
    descriptor: (Ljava/lang/String;)Lcom/oracle/truffle/tools/profiler/impl/CPUSamplerCLI$Output;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // com.oracle.truffle.tools.profiler.impl.CPUSamplerCLI$1 this
        start local 1 // java.lang.String s
         0: .line 66
            aload 1 /* s */
            invokevirtual java.lang.String.toUpperCase:()Ljava/lang/String;
            invokestatic com.oracle.truffle.tools.profiler.impl.CPUSamplerCLI$Output.valueOf:(Ljava/lang/String;)Lcom/oracle/truffle/tools/profiler/impl/CPUSamplerCLI$Output;
         1: areturn
         2: .line 67
      StackMap locals:
      StackMap stack: java.lang.IllegalArgumentException
            pop
         3: .line 68
            new java.lang.IllegalArgumentException
            dup
            ldc "Output can be: histogram, calltree or json"
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
        end local 1 // java.lang.String s
        end local 0 // com.oracle.truffle.tools.profiler.impl.CPUSamplerCLI$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  this  Lcom/oracle/truffle/tools/profiler/impl/CPUSamplerCLI$1;
            0    4     1     s  Ljava/lang/String;
      Exception table:
        from    to  target  type
           0     1       2  Class java.lang.IllegalArgumentException
    MethodParameters:
      Name  Flags
      s     

  public java.lang.Object apply(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=2, locals=2, args_size=2
         0: .line 1
            aload 0
            aload 1
            checkcast java.lang.String
            invokevirtual com.oracle.truffle.tools.profiler.impl.CPUSamplerCLI$1.apply:(Ljava/lang/String;)Lcom/oracle/truffle/tools/profiler/impl/CPUSamplerCLI$Output;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: Ljava/lang/Object;Ljava/util/function/Function<Ljava/lang/String;Lcom/oracle/truffle/tools/profiler/impl/CPUSamplerCLI$Output;>;
SourceFile: "CPUSamplerCLI.java"
EnclosingMethod: com.oracle.truffle.tools.profiler.impl.CPUSamplerCLI
NestHost: com.oracle.truffle.tools.profiler.impl.CPUSamplerCLI
InnerClasses:
  com.oracle.truffle.tools.profiler.impl.CPUSamplerCLI$1
  final Output = com.oracle.truffle.tools.profiler.impl.CPUSamplerCLI$Output of com.oracle.truffle.tools.profiler.impl.CPUSamplerCLI