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/* Properties类继承了Hashtable<object, object>, 隶属于Java.util package */
/* Properties可以load 文件流， 但文件的格式是line-oriented， 就是一行一个属性，
key=value,中间无空格*/
/* System.getProperty("app.home"), 是利用java 执行时的设置系统变量option， -Doption=value 
（command line）*/
public static void updateCCProperties(GenomixJobConf conf) throws FileNotFoundException, IOException, InterruptedException {
        Properties CCProperties = new Properties();
        CCProperties.load(new FileInputStream(System.getProperty("app.home", ".") + File.separator + "conf"
                + File.separator + "cluster.properties"));
                }

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/* parseBoolean 能解析 string to boolean, 若string = “true” 就为true，反之亦然; conf.get()
返回一个string, 尽管FOLLOWS_GRAPH_BUILD 属性是Boolean */
followingBuild = Boolean.parseBoolean(conf.get(GenomixJobConf.FOLLOWS_GRAPH_BUILD));

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/* Patterns 是一个静态enum， arrayFromString()返回一个enum数组，注意遍历style*/
for (Patterns step : Patterns.arrayFromString(pipelineSteps)) {}

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/* 如果同时引入2个driver类, 因为分不清，则可以写全名*/
private edu.uci.ics.genomix.hyracks.graph.driver.Driver hyracksDriver;
private edu.uci.ics.pregelix.core.driver.Driver pregelixDriver;

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hadoop jar pregelix-core-0.2.3-SNAPSHOT-balancer.jar /user/nzhang/test.txt /user/nzhang/good 4

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Eclipse-Preferences-Java-Editor-Templates.
1. the shortcut of editor templates is ctrl + space, however, this shortcut had conflict with system spotLight's shortcut.
2. System->spotlight, then turn off the shortcut
eg，"sysout"coud genereate “System.out.println()"，"foreach" could generate for Loop framwork.

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1. Tab go from parent bullet to child bullet
2. Shift + Tab go back from child bullet to parent bullet
3. Shift type letter without new bullet

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1. Notice that the TeXmacs menus and keyboard behavior are contextual, i.e. they depend on the current mode (i.e. text mode or “math mode”). eg. >= this shortcut can be applied only when current mode is math mode(expression)
2. When using the F1, F2, ..., F12, these keys have conflicts with OS. So please add fn + Fx to remove the conflicts when using these keys.

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^ key: Control key. This acts like a normal control key

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TreeNode prev = null;
    public void inorder(TreeNode root, ArrayList<TreeNode> t, TreeNode prev) {
        //do sth with prev (Note: this prev is the local variable, and has nothing to do with the static prev)
    }