What methods are available on this Java object?

Archive - Originally posted on "The Horse's Mouth" - 2010-07-08 23:25:01 - Graham Ellis
Q: "What can I do with an ArrayIndexOutOfBoundsException?" for example ...

A: Use the javap utility to ask what methods are available on the class ... and descent into its base class structure too, using further javap calls:

wizard:java graham$ javap java.lang.ArrayIndexOutOfBoundsException

Compiled from "ArrayIndexOutOfBoundsException.java"

public class java.lang.ArrayIndexOutOfBoundsException extends java.lang.IndexOutOfBoundsException{

    public java.lang.ArrayIndexOutOfBoundsException();

    public java.lang.ArrayIndexOutOfBoundsException(int);

    public java.lang.ArrayIndexOutOfBoundsException(java.lang.String);

}

 

wizard:java graham$ javap java.lang.IndexOutOfBoundsException

Compiled from "IndexOutOfBoundsException.java"

public class java.lang.IndexOutOfBoundsException extends java.lang.RuntimeException{

    public java.lang.IndexOutOfBoundsException();

    public java.lang.IndexOutOfBoundsException(java.lang.String);

}

 

wizard:java graham$ javap java.lang.RuntimeException

Compiled from "RuntimeException.java"

public class java.lang.RuntimeException extends java.lang.Exception{

    static final long serialVersionUID;

    public java.lang.RuntimeException();

    public java.lang.RuntimeException(java.lang.String);

    public java.lang.RuntimeException(java.lang.String, java.lang.Throwable);

    public java.lang.RuntimeException(java.lang.Throwable);

}

 

wizard:java graham$ javap java.lang.Exception

Compiled from "Exception.java"

public class java.lang.Exception extends java.lang.Throwable{

    static final long serialVersionUID;

    public java.lang.Exception();

    public java.lang.Exception(java.lang.String);

    public java.lang.Exception(java.lang.String, java.lang.Throwable);

    public java.lang.Exception(java.lang.Throwable);

}

 

wizard:java graham$ javap java.lang.Throwable

Compiled from "Throwable.java"

public class java.lang.Throwable extends java.lang.Object implements java.io.Serializable{

    public java.lang.Throwable();

    public java.lang.Throwable(java.lang.String);

    public java.lang.Throwable(java.lang.String, java.lang.Throwable);

    public java.lang.Throwable(java.lang.Throwable);

    public java.lang.String getMessage();

    public java.lang.String getLocalizedMessage();

    public java.lang.Throwable getCause();

    public synchronized java.lang.Throwable initCause(java.lang.Throwable);

    public java.lang.String toString();

    public void printStackTrace();

    public void printStackTrace(java.io.PrintStream);

    public void printStackTrace(java.io.PrintWriter);

    public synchronized native java.lang.Throwable fillInStackTrace();

    public java.lang.StackTraceElement[] getStackTrace();

    public void setStackTrace(java.lang.StackTraceElement[]);

}

 

wizard:java graham$ javap java.lang.Object

Compiled from "Object.java"

public class java.lang.Object{

    public java.lang.Object();

    public final native java.lang.Class getClass();

    public native int hashCode();

    public boolean equals(java.lang.Object);

    protected native java.lang.Object clone()       throws java.lang.CloneNotSupportedException;

    public java.lang.String toString();

    public final native void notify();

    public final native void notifyAll();

    public final native void wait(long)       throws java.lang.InterruptedException;

    public final void wait(long, int)       throws java.lang.InterruptedException;

    public final void wait()       throws java.lang.InterruptedException;

    protected void finalize()       throws java.lang.Throwable;

    static {};

}

I can feel a bit of scripting coming on (Jython would seem appropriate!) if I wanted to do that sort of thing on a regular basis!

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What methods are available on this Java object?