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SprinklerSystem.java

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class WaterSource {

private String s;

WaterSource() {

System.out.println("WaterSource()");

s = "Constructed";

}

public String toString() {

return s;

}

}

public class SprinklerSystem {

private String valve1, valve2, valve3, valve4;

private WaterSource source = new WaterSource();

private int i;

private float f;

public String toString() {

//StringBuilder is created only once: via javap -c

return "valve1 = " + valve1 + " " +

"valve2 = " + valve2 + " " +

"valve3 = " + valve3 + " " +

"valve4 = " + valve4 + "\n" +

"i = " + i + " " + "f = " + f + " " +

"source = " + source;

}

public static void main(String[] args) {

SprinklerSystem sprinklers = new SprinklerSystem();

System.out.println(sprinklers);

}

}