https://github.com/google/guava/guava: Guava is a suite of core and expanded libraries that include utility classes, google's collections, io classes, and much much more. 
public final class com.google.common.base.MoreObjects
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: com.google.common.base.MoreObjects
  super_class: java.lang.Object
{
  public static <T> T firstNonNull(T, );
    descriptor: (Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // java.lang.Object first
        start local 1 // java.lang.Object second
         0: .line 55
            aload 0 /* first */
            ifnull 2
         1: .line 56
            aload 0 /* first */
            areturn
         2: .line 58
      StackMap locals:
      StackMap stack:
            aload 1 /* second */
            ifnull 4
         3: .line 59
            aload 1 /* second */
            areturn
         4: .line 61
      StackMap locals:
      StackMap stack:
            new java.lang.NullPointerException
            dup
            ldc "Both parameters are null"
            invokespecial java.lang.NullPointerException.<init>:(Ljava/lang/String;)V
            athrow
        end local 1 // java.lang.Object second
        end local 0 // java.lang.Object first
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    5     0   first  TT;
            0    5     1  second  TT;
    Signature: <T:Ljava/lang/Object;>(TT;TT;)TT;
    RuntimeVisibleTypeAnnotations: 
      METHOD_FORMAL_PARAMETER
        org.checkerframework.checker.nullness.qual.Nullable()
      METHOD_FORMAL_PARAMETER
        org.checkerframework.checker.nullness.qual.Nullable()
    MethodParameters:
        Name  Flags
      first   
      second  

  public static com.google.common.base.MoreObjects$ToStringHelper toStringHelper(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Lcom/google/common/base/MoreObjects$ToStringHelper;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // java.lang.Object self
         0: .line 105
            new com.google.common.base.MoreObjects$ToStringHelper
            dup
            aload 0 /* self */
            invokevirtual java.lang.Object.getClass:()Ljava/lang/Class;
            invokevirtual java.lang.Class.getSimpleName:()Ljava/lang/String;
            invokespecial com.google.common.base.MoreObjects$ToStringHelper.<init>:(Ljava/lang/String;)V
            areturn
        end local 0 // java.lang.Object self
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  self  Ljava/lang/Object;
    MethodParameters:
      Name  Flags
      self  

  public static com.google.common.base.MoreObjects$ToStringHelper toStringHelper(java.lang.Class<?>);
    descriptor: (Ljava/lang/Class;)Lcom/google/common/base/MoreObjects$ToStringHelper;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // java.lang.Class clazz
         0: .line 119
            new com.google.common.base.MoreObjects$ToStringHelper
            dup
            aload 0 /* clazz */
            invokevirtual java.lang.Class.getSimpleName:()Ljava/lang/String;
            invokespecial com.google.common.base.MoreObjects$ToStringHelper.<init>:(Ljava/lang/String;)V
            areturn
        end local 0 // java.lang.Class clazz
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0  clazz  Ljava/lang/Class<*>;
    Signature: (Ljava/lang/Class<*>;)Lcom/google/common/base/MoreObjects$ToStringHelper;
    MethodParameters:
       Name  Flags
      clazz  

  public static com.google.common.base.MoreObjects$ToStringHelper toStringHelper(java.lang.String);
    descriptor: (Ljava/lang/String;)Lcom/google/common/base/MoreObjects$ToStringHelper;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // java.lang.String className
         0: .line 131
            new com.google.common.base.MoreObjects$ToStringHelper
            dup
            aload 0 /* className */
            invokespecial com.google.common.base.MoreObjects$ToStringHelper.<init>:(Ljava/lang/String;)V
            areturn
        end local 0 // java.lang.String className
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    1     0  className  Ljava/lang/String;
    MethodParameters:
           Name  Flags
      className  

  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.base.MoreObjects this
         0: .line 386
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.google.common.base.MoreObjects this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/base/MoreObjects;
}
SourceFile: "MoreObjects.java"
NestMembers:
  com.google.common.base.MoreObjects$ToStringHelper  com.google.common.base.MoreObjects$ToStringHelper$ValueHolder
InnerClasses:
  public final ToStringHelper = com.google.common.base.MoreObjects$ToStringHelper of com.google.common.base.MoreObjects
    RuntimeInvisibleAnnotations: 
      com.google.common.annotations.GwtCompatible()