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    [main]
    debug=true
    [client]
    timeOut=10

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    ResourceBundle bundle = ResourceBundle.getBundle("test");
    String city = bundle.getString("name");

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    Properties pro = new Properties();
    pro.load(new FileInputStream(new File("./test.properties")));
    String name = (String) pro.get("name");

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    Properties pro = new Properties();
    pro.setProperty("name", "java");
    pro.setProperty("study", "sdf");
    pro.store(new FileOutputStream(new File("test.properties")), "one file");