Challenge exercise Create a new project, heater-exercise, within BlueJ. Edit the details in the project description—the text note you see in the diagram. Create a class, Heater, that contains a single field, temperature whose type is double-precision floating point—see Appendix B, section B.1, for the Java type name that corresponds to this description. Define a constructor that takes no parameters. The temperature field should be set to the value 15.0 in the constructor. Define the mutators warmer and cooler, whose effect is to increase or decrease the value of temperature by 5.0° respectively. Define an accessor method to return the value of temperature.
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