System: clearProperty(String key)

    

public class Main {
  public static void main(String[] a) {
    String oldValue = System.clearProperty("java.class.path");
    System.setProperty("user.dir", "C:/MyProg");
    System.out.println(System.getProperty("user.dir"));
  }
}

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System: clearProperty(String key) : System « java.lang « Java by API

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