35 lines
906 B
Java
35 lines
906 B
Java
//: enumerated/EnumMaps.java
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// Basics of EnumMaps.
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package enumerated;
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import java.util.*;
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import static enumerated.AlarmPoints.*;
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import static net.mindview.util.Print.*;
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interface Command { void action(); }
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public class EnumMaps {
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public static void main(String[] args) {
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EnumMap<AlarmPoints,Command> em =
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new EnumMap<>(AlarmPoints.class);
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em.put(KITCHEN, (Command) () -> {
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print("Kitchen fire!");
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});
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em.put(BATHROOM, (Command) () -> {
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print("Bathroom alert!");
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});
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for(Map.Entry<AlarmPoints,Command> e : em.entrySet()) {
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printnb(e.getKey() + ": ");
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e.getValue().action();
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}
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try { // If there's no value for a particular key:
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em.get(UTILITY).action();
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} catch(Exception e) {
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print("Expected: " + e);
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}
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}
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} /* Output:
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BATHROOM: Bathroom alert!
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KITCHEN: Kitchen fire!
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Expected: java.lang.NullPointerException
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*///:~
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