Where is jar for java.io.File?

Question

When I need to get method signatures for android.content.ContextWrapper, I go to

"C:\Program Files (x86)\Android\android-sdk\platforms\android-18" where android.jar is placed and then execute

javap -s -classpath android.jar android.content.ContextWrapper > out.txt

Now, I need to get method signatures for java.io.File. How is corresponding .jar named?

For android, `java.io.File` should be inside the same jar, `android.jar`. — Shashank Kadne, Oct 12 '13 at 12:08

score 2 · Accepted Answer · answered Oct 12 '13 at 12:08

2

Its present in the rt.jar. You can use the JarFinder to find jars and classes.

Its present in the lib folder of jdk installation directory.

answered Oct 12 '13 at 12:08

Rahul

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nanofarad · Answer 2 · 2013-10-12T12:13:45.407

2

This is rt.jar from your JRE or JDK, namely inside lib on the JRE. Given that you are using Windows, I would head to:

C:\program files\java\jdk1.7.0_25\jre\lib

for a JDK (changing the location to your JDK).

android.jar also has that file, but the former should suffice for a non-android implementation.

edited Oct 12 '13 at 12:13

answered Oct 12 '13 at 12:08

nanofarad

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luiscubal · Answer 3 · 2013-10-12T12:15:58.620

As of Android SDK 16 (I haven't tested this in Android 18) android.jar also has the java.io.File class.

Try opening it as a ZIP file and see which files it has.

ContentWrapper is in the android/content folder.

File exists in the java/io folder.

Here are the first few lines of javap output for android.jar java.io.File

Compiled from "File.java"
public class java.io.File implements java.io.Serializable, java.lang.Comparable<java.io.File> {
  public static final char separatorChar;
    Signature: C
  public static final java.lang.String separator;
    Signature: Ljava/lang/String;
  public static final char pathSeparatorChar;
    Signature: C
  public static final java.lang.String pathSeparator;
    Signature: Ljava/lang/String;
  static final boolean $assertionsDisabled;
    Signature: Z
  int getPrefixLength();
    Signature: ()I

  public java.io.File(java.lang.String);
    Signature: (Ljava/lang/String;)V

  public java.io.File(java.lang.String, java.lang.String);
    Signature: (Ljava/lang/String;Ljava/lang/String;)V

score 1 · Answer 4 · answered Oct 12 '13 at 12:10

1

It is present in the java runtime library of java version you are using. For me it is in

/home/aniket/jdk1.7.0_11/jre/lib/rt.jar

Check accordingly.

answered Oct 12 '13 at 12:10

Aniket Thakur

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Where is jar for java.io.File?

4 Answers4