Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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PLEASE ENSURE TO USE THE FRAMEWORK PROVIDED IN THE IMAGES, AND THAT IT WORKS WITH THE TESTER CLASS. PLEASE DONT EDIT THE TEST CLASS.
Simulate a circuit for controlling a hallway light that has switches at both ends of the hallway. Each switch can be up or down, and the light can be on or off. Toggling either switch turns the lamp on or off.
Provide methods
public int getFirstSwitchState() // 0 for down, 1 for up public int getSecondSwitchState()
public int getLampState() // 0 for off, 1 for on
public void toggleFirstSwitch()
public void toggleSecondSwitch()
Transcribed Image Text:public class Circuit{
private int firstSwitchState;
private int secondSwitchState;
private int lampState;
public Circuit(){
// this is the constructor
// initialize all switches to down and light to off
// your code here
}
public void toggleFirstSwitch(){
// this is a mutator method
// that toggles the first switch
// your code here
public void toggleSecondSwitch(){
// this is a mutator method
// that toggles the second switch
// your code here
}
public int getLampState ( ) {
// this is an accessor method for the lamp state
// your code here
}
public int getFirstSwitchState(){
// this is an accessor method for the first switch
// your code here
}
public int getSecondSwitchState(){
// this is an accessor method for the second switch
// your code here
}
![public class CircuitTester{
public static void main(String[] args){
Circuit myCircuit = new Circuit();
// test initial state
+ myCircuit.getLampState());
+ myCircuit.getFirstSwitchState());
System.out.println("current lamp state:
System.out.println("first switch state:
%3D
System.out.println("second switch state:
+ myCircuit.getSecondSwitchState());
%3D
System.out.println();
// test first switch
System.out.println("Toggle first switch");
myCircuit.toggleFirstSwitch ();
+ myCircuit.getLampState());
+ myCircuit.getFirstSwitchState());
+ myCircuit.getSecondSwitchState ());
System.out.println("current lamp state:
System.out.println("first switch state:
System.out.println("second switch state:
%3D
System.out.println();
// test second switch
System.out.println("Toggle second switch");
myCircuit.toggleSecondSwitch();
System.out.println("current lamp state: "
+ myCircuit.getLampState());
System.out.println("first switch state:
+ myCircuit.getFirstSwitchState());
System.out.println("second switch state:
+ myCircuit. getSecondSwitchState ());
%3D
System.out.println();
// test first switch again
System.out.println("Toggle first switch");
myCircuit.toggleFirstSwitch ();
System.out.println("current lamp state:
%3D
+ myCircuit.getLampState());
+ myCircuit.getFirstSwitchState());
+ myCircuit.getSecondSwitchState ());
System.out.println("first switch state:
System.out.println("second switch state:
System.out.println();
}
}](https://content.bartleby.com/qna-images/question/123fe9bd-f5bf-404f-97ce-90ae622db155/7938ca50-1f73-4074-a60a-3986c9a5f3a9/8l2m4fr_processed.png)
Transcribed Image Text:public class CircuitTester{
public static void main(String[] args){
Circuit myCircuit = new Circuit();
// test initial state
+ myCircuit.getLampState());
+ myCircuit.getFirstSwitchState());
System.out.println("current lamp state:
System.out.println("first switch state:
%3D
System.out.println("second switch state:
+ myCircuit.getSecondSwitchState());
%3D
System.out.println();
// test first switch
System.out.println("Toggle first switch");
myCircuit.toggleFirstSwitch ();
+ myCircuit.getLampState());
+ myCircuit.getFirstSwitchState());
+ myCircuit.getSecondSwitchState ());
System.out.println("current lamp state:
System.out.println("first switch state:
System.out.println("second switch state:
%3D
System.out.println();
// test second switch
System.out.println("Toggle second switch");
myCircuit.toggleSecondSwitch();
System.out.println("current lamp state: "
+ myCircuit.getLampState());
System.out.println("first switch state:
+ myCircuit.getFirstSwitchState());
System.out.println("second switch state:
+ myCircuit. getSecondSwitchState ());
%3D
System.out.println();
// test first switch again
System.out.println("Toggle first switch");
myCircuit.toggleFirstSwitch ();
System.out.println("current lamp state:
%3D
+ myCircuit.getLampState());
+ myCircuit.getFirstSwitchState());
+ myCircuit.getSecondSwitchState ());
System.out.println("first switch state:
System.out.println("second switch state:
System.out.println();
}
}
Expert Solution
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Circuit.java
CODE TEXT SO YOU DON'T HAVE TO TYPE :)
public class Circuit {
private int firstSwitchState; // 0 = down, 1 = up
private int secondSwitchState; // 0 = down, 1 = up
private int lampState; // 0 = off, 1 = on
public Circuit() {
firstSwitchState = 0;
secondSwitchState = 0;
lampState = 0;
}
public void toggleFirstSwitch() {
firstSwitchState = (firstSwitchState == 1) ? (0) : (1);
lampState = (lampState == 1) ? (0) : (1);
}
public void toggleSecondSwitch() {
secondSwitchState = (secondSwitchState == 1) ? (0) : (1);
lampState = (lampState == 1) ? (0) : (1);
}
public int getLampState() {
return lampState;
}
public int getFirstSwitchState() {
return firstSwitchState;
}
public int getSecondSwitchState() {
return secondSwitchState;
}
}
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