1 package p; 2 3 enum A { 4 RED, GREEN, BLUE, YELLOW; 5 A other; getOther()6 public A getOther() { 7 return other; 8 } setOther(A b)9 public void setOther(A b) { 10 other= b; 11 } 12 } 13 14 class User { m()15 void m() { 16 A.RED.setOther(A.GREEN); 17 if (A.RED.getOther() == A.GREEN) { 18 A.GREEN.other= null; 19 } 20 } 21 }