小编Ben*_*Ben的帖子

如何在Mac OS X上将TextMate设置为默认文本编辑器？

我试过了

ln -s /Applications/TextMate.app/Contents/Resources/mate ~/bin/mate
export EDITOR='mate -w'

但这不起作用.

当我在终端上键入rails服务器时,出现以下错误.我不知道如何解决它.有人能给我一个帮助吗？而且我还需要一个ruby on rails mac os x Lion安装教程.

:simple_cms benhuayang$ rails server
/Users/benhuayang/.rvm/gems/ruby-1.9.3-p0/gems/mysql2-0.3.11/lib/mysql2.rb:9:in `require':
dlopen(/Users/benhuayang/.rvm/gems/ruby-1.9.3-p0/gems/mysql2-0.3.11/lib/mysql2/mysql2.bundle, 9): Library not loaded: libmysqlclient.18.dylib (LoadError)  
Referenced from:
/Users/benhuayang/.rvm/gems/ruby-1.9.3-p0/gems/mysql2-0.3.11/lib/mysql2/mysql2.bundle
Reason: image not found -
/Users/benhuayang/.rvm/gems/ruby-1.9.3-p0/gems/mysql2-0.3.11/lib/mysql2/mysql2.bundle   from
/Users/benhuayang/.rvm/gems/ruby-1.9.3-p0/gems/mysql2-0.3.11/lib/mysql2.rb:9:in `<top (required)>'    from
/Users/benhuayang/.rvm/gems/ruby-1.9.3-p0@global/gems/bundler-1.0.21/lib/bundler/runtime.rb:68:in `require'     from
/Users/benhuayang/.rvm/gems/ruby-1.9.3-p0@global/gems/bundler-1.0.21/lib/bundler/runtime.rb:68:in `block (2 levels) in require'     from
/Users/benhuayang/.rvm/gems/ruby-1.9.3-p0@global/gems/bundler-1.0.21/lib/bundler/runtime.rb:66:in `each'    from
/Users/benhuayang/.rvm/gems/ruby-1.9.3-p0@global/gems/bundler-1.0.21/lib/bundler/runtime.rb:66:in `block in require'    from
/Users/benhuayang/.rvm/gems/ruby-1.9.3-p0@global/gems/bundler-1.0.21/lib/bundler/runtime.rb:55:in `each'    from
/Users/benhuayang/.rvm/gems/ruby-1.9.3-p0@global/gems/bundler-1.0.21/lib/bundler/runtime.rb:55:in `require'     from
/Users/benhuayang/.rvm/gems/ruby-1.9.3-p0@global/gems/bundler-1.0.21/lib/bundler.rb:122:in `require'    from
/Users/benhuayang/Sites/simple_cms/config/application.rb:7:in `<top (required)>' from
/Users/benhuayang/.rvm/gems/ruby-1.9.3-p0/gems/railties-3.2.1/lib/rails/commands.rb:53:in `require'     from
/Users/benhuayang/.rvm/gems/ruby-1.9.3-p0/gems/railties-3.2.1/lib/rails/commands.rb:53:in `block in '   from
/Users/benhuayang/.rvm/gems/ruby-1.9.3-p0/gems/railties-3.2.1/lib/rails/commands.rb:50:in `tap'     from
/Users/benhuayang/.rvm/gems/ruby-1.9.3-p0/gems/railties-3.2.1/lib/rails/commands.rb:50:in `<top (required)>'  from …

我试图删除索引1处的对象,但代码将无法编译.

我也不明白这一点:我将"iphone"字符串设置为索引0,然后将其从索引0中删除,但输出仍然首先显示"iphone".任何人都可以向我解释一下吗？

int main (int argc, const char * argv[])
{    
    @autoreleasepool {

        //create three string objetc
        NSString *banana  = @"This is banana";
        NSString *apple = @"This is apple";
        NSString *iphone =@"This is iPhone";

        //create  an empty array
        NSMutableArray *itemList = [NSMutableArray array];

        // add the item to the array
        [itemList addObject:banana];
        [itemList addObject:apple];

        // put the iphone to the at first

        [itemList insertObject:iphone atIndex:0];

        for (NSString *l in itemList) {
            NSLog(@"The  Item in the list is %@",l);
        }
        [itemList …

我是斯卡拉的新手.

这是简单的代码

object SimpleIfStatementDemo {
  def main(args: Array[String]) {   
    var numA: Int = args(0).toInt
    var numB: Int = args(1).toInt
    if(numA>numB) {
      print(numA)
    } else {
      print(numB)               
    }
  }
}

它可以编译,但不能运行它.这是错误我得到了它

java.lang.ArrayIndexOutOfBoundsException: 0   at

Run Code Online (Sandbox Code Playgroud)

位于sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)的sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)的Main.main(SimpleIfSatementDemo.scala)主$ .main(SimpleIfSatementDemo.scala:5).在scala.tools.nsc.util.ScalaClassLoader $$ anonfun $ run $ 1.apply(ScalaClassLoader.)的java.lang.reflect.Method.invoke(Method.java:597)中反映.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25). scala:78)在scala.tools的scala.tools.nsc.util.ScalaClassLoader $ class.asContext(ScalaClassLoader.scala:24)scala.tools.nsc.util.ScalaClassLoader $ URLClassLoader.asContext(ScalaClassLoader.scala:88) .sc.util.ScalaClassLoader $ class.run(ScalaClassLoader.scala:78)at scala.tools.nsc.util.ScalaClassLoader $ URLClassLoader.run(ScalaClassLoader.scala:101)at scala.tools.nsc.ObjectRunner $ .run( ObjectRunner.scala:33)scala.tools.nsc.ObjectRunner $ .runAndCatch(ObjectRunner.scala:40)at scala.tools.nsc.ScriptRunner.scala $ tools $ nsc $ ScriptRunner $$ runCompiled (ScriptRunner.scala:171)scala.tools.nsc.ScriptRunner $$ anonfun $ runScript $ 1.apply(ScriptRunner.scala:188)at scala.tools.nsc.ScriptRunner $$ anonfun $ runScript …