在Mac OS X上开始使用Java开箱即用

Question

My 10.5.3 install on a MacBook doesn't seem to want to build an example from Sun. It claims it can't find java.io.Console to import. This is annoying to me, and after much searching I can't figure out what I should do to fix it.

I have installed the Apple Developer Tools.

Here's what happens:

macbook:~ dlamblin$ javac RegexTestHarness.java
RegexTestHarness.java:32: cannot find symbol
symbol  : class Console
location: package java.io
import java.io.Console;
               ^
RegexTestHarness.java:39: cannot find symbol
symbol  : class Console
location: class RegexTestHarness
        Console console = System.console();
        ^
RegexTestHarness.java:39: cannot find symbol
symbol  : method console()
location: class java.lang.System
        Console console = System.console();
                                ^
3 errors

Answer 1

mmyers已经暗示过这一点，但听起来你还没有升级到Java 6.你可以从这里得到它： http ： //support.apple.com/downloads/Java_for_Mac_OS_X_10_5_Update_4

Answer 2

I assume you have already installed Java 6 on your machine, because java.io.Console is a Java 1.6 class. I have run into cases where I update OS X to Java 6, but when run from a command line, the older version is still used. This has happened even after adjusting the Java Preferences app (Applications > Utilities > Java Preferences).

Here is how I worked around it.

$ cd /System/Library/Frameworks/JavaVM.framework/Versions
$ sudo rm CurrentJDK
$ sudo ln -s 1.6.0 CurrentJDK