40 lines
1.1 KiB
Java
40 lines
1.1 KiB
Java
// reuse/SprinklerSystem.java
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// (c)2021 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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// Composition for code reuse
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class WaterSource {
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private String s;
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WaterSource() {
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System.out.println("WaterSource()");
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s = "Constructed";
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}
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@Override public String toString() { return s; }
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}
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public class SprinklerSystem {
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private String valve1, valve2, valve3, valve4;
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private WaterSource source = new WaterSource();
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private int i;
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private float f;
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@Override public String toString() {
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return
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"valve1 = " + valve1 + " " +
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"valve2 = " + valve2 + " " +
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"valve3 = " + valve3 + " " +
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"valve4 = " + valve4 + "\n" +
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"i = " + i + " " + "f = " + f + " " +
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"source = " + source; // [1]
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}
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public static void main(String[] args) {
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SprinklerSystem sprinklers = new SprinklerSystem();
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System.out.println(sprinklers);
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}
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}
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/* Output:
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WaterSource()
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valve1 = null valve2 = null valve3 = null valve4 = null
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i = 0 f = 0.0 source = Constructed
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*/
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