Method findRoom, revisited

// Return the room with id# targetId,

// or null if there is no such room.

public static Room findRoom(int targetId) {

Room r = last;

while (r != null && r.id != targetId)

r = r.previous;

return r;

}

• expression && expression is called a conjunction. It is true only when both operands are true. If the left operand is false, the right operand is not evaluated.

• Note: The order of the conjunction is important! In particular, it would be wrong to use the conjunction

r.id != targetId && r != null

• Why?

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