Java The Complete Reference, Seventh Edition

a = ABCDEFGHIJ

b = ABCDEFGHIJ

a = AABCDEFGHI

b = BCDEFGHIJJ

Environment Properties

The following properties are available:

file.separator java.specification.version java.vm.version

java.class.path java.vendor line.separator

java.class.version java.vendor.url os.arch

java.compiler java.version os.name

java.ext.dirs java.vm.name os.version

java.home java.vm.specification.name path.separator

java.io.tmpdir java.vm.specification.vendor user.dir

java.librar y.path java.vm.specification.version user.home

java.specification.name java.vm.vendor user.name

java.specification.vendor

You can obtain the values of various environment variables by calling the

System.getProperty( )method. For example, the following program displays the

path to the current user directory:

class ShowUserDir {

public static void main(String args[]) {

System.out.println(System.getProperty("user.dir"));

}

}

Object

As mentioned in Part I,Objectis a superclass of all other classes.Objectdefines the

methods shown in Table 16-14, which are available to every object.

412 Part II: The Java Library

Method Description

Object clone( )

throws

CloneNotSupportedException

Creates a new object that is the same as the

invoking object.

boolean equals(Objectobject) Returnstrueif the invoking object is equivalent to

object.

void finalize( )

throws Throwable

Defaultfinalize( )method. This is usually overridden

by subclasses.

TABLE 16-14 The Methods Defined byObject