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.hash.HashingOutputStream extends java.io.FilterOutputStream
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: com.google.common.hash.HashingOutputStream
  super_class: java.io.FilterOutputStream
{
  private final com.google.common.hash.Hasher hasher;
    descriptor: Lcom/google/common/hash/Hasher;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  public void <init>(com.google.common.hash.HashFunction, java.io.OutputStream);
    descriptor: (Lcom/google/common/hash/HashFunction;Ljava/io/OutputStream;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // com.google.common.hash.HashingOutputStream this
        start local 1 // com.google.common.hash.HashFunction hashFunction
        start local 2 // java.io.OutputStream out
         0: .line 45
            aload 0 /* this */
            aload 2 /* out */
            invokestatic com.google.common.base.Preconditions.checkNotNull:(Ljava/lang/Object;)Ljava/lang/Object;
            checkcast java.io.OutputStream
            invokespecial java.io.FilterOutputStream.<init>:(Ljava/io/OutputStream;)V
         1: .line 46
            aload 0 /* this */
            aload 1 /* hashFunction */
            invokeinterface com.google.common.hash.HashFunction.newHasher:()Lcom/google/common/hash/Hasher;
            invokestatic com.google.common.base.Preconditions.checkNotNull:(Ljava/lang/Object;)Ljava/lang/Object;
            checkcast com.google.common.hash.Hasher
            putfield com.google.common.hash.HashingOutputStream.hasher:Lcom/google/common/hash/Hasher;
         2: .line 47
            return
        end local 2 // java.io.OutputStream out
        end local 1 // com.google.common.hash.HashFunction hashFunction
        end local 0 // com.google.common.hash.HashingOutputStream this
      LocalVariableTable:
        Start  End  Slot          Name  Signature
            0    3     0          this  Lcom/google/common/hash/HashingOutputStream;
            0    3     1  hashFunction  Lcom/google/common/hash/HashFunction;
            0    3     2           out  Ljava/io/OutputStream;
    MethodParameters:
              Name  Flags
      hashFunction  
      out           

  public void write(int);
    descriptor: (I)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.google.common.hash.HashingOutputStream this
        start local 1 // int b
         0: .line 51
            aload 0 /* this */
            getfield com.google.common.hash.HashingOutputStream.hasher:Lcom/google/common/hash/Hasher;
            iload 1 /* b */
            i2b
            invokeinterface com.google.common.hash.Hasher.putByte:(B)Lcom/google/common/hash/Hasher;
            pop
         1: .line 52
            aload 0 /* this */
            getfield com.google.common.hash.HashingOutputStream.out:Ljava/io/OutputStream;
            iload 1 /* b */
            invokevirtual java.io.OutputStream.write:(I)V
         2: .line 53
            return
        end local 1 // int b
        end local 0 // com.google.common.hash.HashingOutputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lcom/google/common/hash/HashingOutputStream;
            0    3     1     b  I
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      b     

  public void write(byte[], int, int);
    descriptor: ([BII)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=4, args_size=4
        start local 0 // com.google.common.hash.HashingOutputStream this
        start local 1 // byte[] bytes
        start local 2 // int off
        start local 3 // int len
         0: .line 57
            aload 0 /* this */
            getfield com.google.common.hash.HashingOutputStream.hasher:Lcom/google/common/hash/Hasher;
            aload 1 /* bytes */
            iload 2 /* off */
            iload 3 /* len */
            invokeinterface com.google.common.hash.Hasher.putBytes:([BII)Lcom/google/common/hash/Hasher;
            pop
         1: .line 58
            aload 0 /* this */
            getfield com.google.common.hash.HashingOutputStream.out:Ljava/io/OutputStream;
            aload 1 /* bytes */
            iload 2 /* off */
            iload 3 /* len */
            invokevirtual java.io.OutputStream.write:([BII)V
         2: .line 59
            return
        end local 3 // int len
        end local 2 // int off
        end local 1 // byte[] bytes
        end local 0 // com.google.common.hash.HashingOutputStream this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    3     0   this  Lcom/google/common/hash/HashingOutputStream;
            0    3     1  bytes  [B
            0    3     2    off  I
            0    3     3    len  I
    Exceptions:
      throws java.io.IOException
    MethodParameters:
       Name  Flags
      bytes  
      off    
      len    

  public com.google.common.hash.HashCode hash();
    descriptor: ()Lcom/google/common/hash/HashCode;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.hash.HashingOutputStream this
         0: .line 66
            aload 0 /* this */
            getfield com.google.common.hash.HashingOutputStream.hasher:Lcom/google/common/hash/Hasher;
            invokeinterface com.google.common.hash.Hasher.hash:()Lcom/google/common/hash/HashCode;
            areturn
        end local 0 // com.google.common.hash.HashingOutputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/hash/HashingOutputStream;

  public void close();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.hash.HashingOutputStream this
         0: .line 74
            aload 0 /* this */
            getfield com.google.common.hash.HashingOutputStream.out:Ljava/io/OutputStream;
            invokevirtual java.io.OutputStream.close:()V
         1: .line 75
            return
        end local 0 // com.google.common.hash.HashingOutputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/google/common/hash/HashingOutputStream;
    Exceptions:
      throws java.io.IOException
}
SourceFile: "HashingOutputStream.java"
    RuntimeInvisibleAnnotations: 
      com.google.common.annotations.Beta()