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. 
final class com.google.common.io.Resources$UrlByteSource extends com.google.common.io.ByteSource
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: com.google.common.io.Resources$UrlByteSource
  super_class: com.google.common.io.ByteSource
{
  private final java.net.URL url;
    descriptor: Ljava/net/URL;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private void <init>(java.net.URL);
    descriptor: (Ljava/net/URL;)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.google.common.io.Resources$UrlByteSource this
        start local 1 // java.net.URL url
         0: .line 64
            aload 0 /* this */
            invokespecial com.google.common.io.ByteSource.<init>:()V
         1: .line 65
            aload 0 /* this */
            aload 1 /* url */
            invokestatic com.google.common.base.Preconditions.checkNotNull:(Ljava/lang/Object;)Ljava/lang/Object;
            checkcast java.net.URL
            putfield com.google.common.io.Resources$UrlByteSource.url:Ljava/net/URL;
         2: .line 66
            return
        end local 1 // java.net.URL url
        end local 0 // com.google.common.io.Resources$UrlByteSource this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lcom/google/common/io/Resources$UrlByteSource;
            0    3     1   url  Ljava/net/URL;
    MethodParameters:
      Name  Flags
      url   

  public java.io.InputStream openStream();
    descriptor: ()Ljava/io/InputStream;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.io.Resources$UrlByteSource this
         0: .line 70
            aload 0 /* this */
            getfield com.google.common.io.Resources$UrlByteSource.url:Ljava/net/URL;
            invokevirtual java.net.URL.openStream:()Ljava/io/InputStream;
            areturn
        end local 0 // com.google.common.io.Resources$UrlByteSource this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/io/Resources$UrlByteSource;
    Exceptions:
      throws java.io.IOException

  public java.lang.String toString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.google.common.io.Resources$UrlByteSource this
         0: .line 75
            new java.lang.StringBuilder
            dup
            ldc "Resources.asByteSource("
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 0 /* this */
            getfield com.google.common.io.Resources$UrlByteSource.url:Ljava/net/URL;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/Object;)Ljava/lang/StringBuilder;
            ldc ")"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            areturn
        end local 0 // com.google.common.io.Resources$UrlByteSource this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/io/Resources$UrlByteSource;
}
SourceFile: "Resources.java"
NestHost: com.google.common.io.Resources
InnerClasses:
  private final UrlByteSource = com.google.common.io.Resources$UrlByteSource of com.google.common.io.Resources