WithResources.java

package test;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class WithResources
{
    public static void main(String[] args) throws IOException
    {
        try (OutputStream bar = new FileOutputStream(new File("foo")))
        {
            System.out.println("hi");
        }
    }
}

WithResources.javap

$ javap -cp target/classes -c test.WithResources
Compiled from "WithResources.java"
public class test.WithResources {
  public test.WithResources();
    Code:
       0: aload_0
       1: invokespecial #1                  // Method java/lang/Object."<init>":()V
       4: return

  public static void main(java.lang.String[]) throws java.io.IOException;
    Code:
       0: new           #2                  // class java/io/FileOutputStream
       3: dup
       4: new           #3                  // class java/io/File
       7: dup
       8: ldc           #4                  // String foo
      10: invokespecial #5                  // Method java/io/File."<init>":(Ljava/lang/String;)V
      13: invokespecial #6                  // Method java/io/FileOutputStream."<init>":(Ljava/io/File;)V
      16: astore_1
      17: getstatic     #7                  // Field java/lang/System.out:Ljava/io/PrintStream;
      20: ldc           #8                  // String hi
      22: invokevirtual #9                  // Method java/io/PrintStream.println:(Ljava/lang/String;)V
      25: aload_1
      26: invokevirtual #10                 // Method java/io/OutputStream.close:()V
      29: goto          48
      32: astore_2
      33: aload_1
      34: invokevirtual #10                 // Method java/io/OutputStream.close:()V
      37: goto          46
      40: astore_3
      41: aload_2
      42: aload_3
      43: invokevirtual #12                 // Method java/lang/Throwable.addSuppressed:(Ljava/lang/Throwable;)V
      46: aload_2
      47: athrow
      48: return
    Exception table:
       from    to  target type
          17    25    32   Class java/lang/Throwable
          33    37    40   Class java/lang/Throwable

WithResources2.java

package test;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class WithResources2
{
    public static void main(String[] args) throws IOException
    {
        FileOutputStream zed = new FileOutputStream(new File("foo"));

        try (OutputStream bar = zed)
        {
            System.out.println("hi");
        }
    }
}

WithResources2.javap

$ javap -cp target/classes -c test.WithResources2
Compiled from "WithResources.java"
public class test.WithResources2 {
  public test.WithResources2();
    Code:
       0: aload_0
       1: invokespecial #1                  // Method java/lang/Object."<init>":()V
       4: return

  public static void main(java.lang.String[]) throws java.io.IOException;
    Code:
       0: new           #2                  // class java/io/FileOutputStream
       3: dup
       4: new           #3                  // class java/io/File
       7: dup
       8: ldc           #4                  // String foo
      10: invokespecial #5                  // Method java/io/File."<init>":(Ljava/lang/String;)V
      13: invokespecial #6                  // Method java/io/FileOutputStream."<init>":(Ljava/io/File;)V
      16: astore_1
      17: aload_1
      18: astore_2
      19: getstatic     #7                  // Field java/lang/System.out:Ljava/io/PrintStream;
      22: ldc           #8                  // String hi
      24: invokevirtual #9                  // Method java/io/PrintStream.println:(Ljava/lang/String;)V
      27: aload_2
      28: ifnull        60
      31: aload_2
      32: invokevirtual #10                 // Method java/io/OutputStream.close:()V
      35: goto          60
      38: astore_3
      39: aload_2
      40: ifnull        58
      43: aload_2
      44: invokevirtual #10                 // Method java/io/OutputStream.close:()V
      47: goto          58
      50: astore        4
      52: aload_3
      53: aload         4
      55: invokevirtual #12                 // Method java/lang/Throwable.addSuppressed:(Ljava/lang/Throwable;)V
      58: aload_3
      59: athrow
      60: return
    Exception table:
       from    to  target type
          19    27    38   Class java/lang/Throwable
          43    47    50   Class java/lang/Throwable