java学习(11) 枚举enum

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原文链接http://blog.csdn.net/qq_27093465/article/details/52180865

public enum Color {    RED, GREEN, BLANK, YELLOW  }  
enum Signal {      GREEN, YELLOW, RED  }  public class TrafficLight {      Signal color = Signal.RED;      public void change() {          switch (color) {          case RED:              color = Signal.GREEN;              break;          case YELLOW:              color = Signal.RED;              break;          case GREEN:              color = Signal.YELLOW;              break;          }      }  }  
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