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. 
class com.google.common.util.concurrent.Callables$4 implements java.lang.Runnable
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.google.common.util.concurrent.Callables$4
  super_class: java.lang.Object
{
  private final com.google.common.base.Supplier val$nameSupplier;
    descriptor: Lcom/google/common/base/Supplier;
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  private final java.lang.Runnable val$task;
    descriptor: Ljava/lang/Runnable;
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  void <init>(com.google.common.base.Supplier, java.lang.Runnable);
    descriptor: (Lcom/google/common/base/Supplier;Ljava/lang/Runnable;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // com.google.common.util.concurrent.Callables$4 this
         0: .line 112
            aload 0 /* this */
            aload 1
            putfield com.google.common.util.concurrent.Callables$4.val$nameSupplier:Lcom/google/common/base/Supplier;
            aload 0 /* this */
            aload 2
            putfield com.google.common.util.concurrent.Callables$4.val$task:Ljava/lang/Runnable;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.google.common.util.concurrent.Callables$4 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/util/concurrent/Callables$4;
    MethodParameters:
                  Name  Flags
      val$nameSupplier  final
      val$task          final

  public void run();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=5, args_size=1
        start local 0 // com.google.common.util.concurrent.Callables$4 this
         0: .line 115
            invokestatic java.lang.Thread.currentThread:()Ljava/lang/Thread;
            astore 1 /* currentThread */
        start local 1 // java.lang.Thread currentThread
         1: .line 116
            aload 1 /* currentThread */
            invokevirtual java.lang.Thread.getName:()Ljava/lang/String;
            astore 2 /* oldName */
        start local 2 // java.lang.String oldName
         2: .line 117
            aload 0 /* this */
            getfield com.google.common.util.concurrent.Callables$4.val$nameSupplier:Lcom/google/common/base/Supplier;
            invokeinterface com.google.common.base.Supplier.get:()Ljava/lang/Object;
            checkcast java.lang.String
            aload 1 /* currentThread */
            invokestatic com.google.common.util.concurrent.Callables.trySetName:(Ljava/lang/String;Ljava/lang/Thread;)Z
            istore 3 /* restoreName */
        start local 3 // boolean restoreName
         3: .line 119
            aload 0 /* this */
            getfield com.google.common.util.concurrent.Callables$4.val$task:Ljava/lang/Runnable;
            invokeinterface java.lang.Runnable.run:()V
         4: .line 120
            goto 9
      StackMap locals: com.google.common.util.concurrent.Callables$4 java.lang.Thread java.lang.String int
      StackMap stack: java.lang.Throwable
         5: astore 4
         6: .line 121
            iload 3 /* restoreName */
            ifeq 8
         7: .line 122
            aload 2 /* oldName */
            aload 1 /* currentThread */
            invokestatic com.google.common.util.concurrent.Callables.trySetName:(Ljava/lang/String;Ljava/lang/Thread;)Z
            pop
         8: .line 124
      StackMap locals: java.lang.Throwable
      StackMap stack:
            aload 4
            athrow
         9: .line 121
      StackMap locals:
      StackMap stack:
            iload 3 /* restoreName */
            ifeq 11
        10: .line 122
            aload 2 /* oldName */
            aload 1 /* currentThread */
            invokestatic com.google.common.util.concurrent.Callables.trySetName:(Ljava/lang/String;Ljava/lang/Thread;)Z
            pop
        11: .line 125
      StackMap locals:
      StackMap stack:
            return
        end local 3 // boolean restoreName
        end local 2 // java.lang.String oldName
        end local 1 // java.lang.Thread currentThread
        end local 0 // com.google.common.util.concurrent.Callables$4 this
      LocalVariableTable:
        Start  End  Slot           Name  Signature
            0   12     0           this  Lcom/google/common/util/concurrent/Callables$4;
            1   12     1  currentThread  Ljava/lang/Thread;
            2   12     2        oldName  Ljava/lang/String;
            3   12     3    restoreName  Z
      Exception table:
        from    to  target  type
           3     5       5  any
}
SourceFile: "Callables.java"
EnclosingMethod: com.google.common.util.concurrent.Callables.threadRenaming:(Ljava/lang/Runnable;Lcom/google/common/base/Supplier;)Ljava/lang/Runnable;
NestHost: com.google.common.util.concurrent.Callables
InnerClasses:
  com.google.common.util.concurrent.Callables$4