📄 light.java
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// Introduced in Chapter 3/** A light bulb. */public class Light { /** Whether the Light is on. */ private boolean on; /** A Light is off by default. */ public Light() { on = false; } /** Return true if the Light is on. */ public boolean isOn() { return on; } /** Set whether the Light is on. */ public void setOn(boolean on) { this.on = on; } public String toString() { if (on) { return "O"; } else { return "."; } }}
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